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منصور محمدی
دینانی
author
احمد
اکبری
author
text
article
2001
per
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12994_bd10f3ce460fa42c2af837fdb30f517a.pdf
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علی اکبر
عبادی
author
احمد
معینی
author
رضا بزرگی
پور
author
text
article
2001
per
In this study, response of twenty Iranian hexaploid wheat (Triticum aestivum L.) genotypes were investigated for anther culture. Donor plants were
grown in a greenhouse using randomized block design with three replications. Anthers were plated on a CHB liquid medium containing 90 g/1 maltose, 0.5
mg/12,4-D and 0.5 mgll kine tine. All genotypes produced calli, embryoids and green plants. Analysis of variance indicated a highly significant difference
between the genotypes for all the traits studied (numebr of the embryoids per 100 anthers; total, albino and green regenerated plants per 100 anthers).
'Moghan l' cultivar produced the highest green and total regenerated plants (16.46% and 29.71 % respectively) and the M- 75-13 genotype showed the
lowest level of green and total regenerated plants (0.85% and 1.99%). 'Atrak' cultivar had the highest value of callus production (114.6%) whereas' Alborz'
0
and 'Pastoor' cultivars produced the lowest level (11.1 % and 11.8%
respectively). 'Atrak' and 'Rasool' cultivars produced the highest level of
albino plants. It could be concluded that genotypic response to anther culture and independency of androgenic traits are evident.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12995_834be75f7212dd7389684b77f14bdcc6.pdf
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احمد
رضوانفر
author
text
article
2001
per
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12996_21036bb6fc6d4b41dca10ffc6ae17669.pdf
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جمال
جوانمردی
author
حسین
لسانی
author
عبدالکریم
کاشی
author
text
article
2001
per
This expriment was carried out to determine the effect of sodium chloride (NaCl) on absorption and transportation of mineral elements in five
native of Iran cultivars of melon (Cucumis melo L.) namely: "Abbas shuri", "Suski", "Zarde Karaj", "Khaghani" and "Tashkandi". Half-strenght Hogaland
solution with final salinity levels (0, 2.5, 5, 7.5 gr/lit, NaCI) were used for a period of 75 days. Increase in salinity concentration, increased Na+, CI-,
Na+jK- ratio and decreased K+, Ca2+, Mg2+ in leaf and root tissues. CI¬(except in "Tashkandi") , K+, Ca2+, and Mg2+ contents in leaves were higher
than those in root tissues, but Na+ and Na+jK+ in leaves were lower than those in roots. The highest Na+jK+ ratio in leaves, was observed in "Abbas
shuri" and "Khaghani", while the lowest ratios were observed in "Tashkandi",
"Zarde Karaj" while "Suski" respectively. According to the above results, it seems that cultivar "Suski" exhibits a ni_her salt tolerance than the other
treated cultivars.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12997_ce6a91c3fc2e9958a77aba1298138289.pdf
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محمود
اخوت
author
صادق
جلالی
author
غلامحسین
مصاحبی
author
شیرین
قربانی
author
text
article
2001
per
Investigations on sugar beet mosaic, through different antisera methods
used, showed that sugar beet mosaic virus (BMY) and cucumber mosaic virus
(CMY) caused the disease in sugar beet. in Karaj region. The viruses were purified using differential centrifugation. The virus yields in the final
preparations were 0.35 mg/mL for BMV and 0.98 mg/ml. for CMY , absorption spectrum of them were 260-240 and 260-220 nanometers
respectively. Antisera against the above mentioned viruses were prepared in
rabbit then titrated. Titration for BMV and CMY were 256 and 512
respectively in micropredpitin tests. Research in distribution of the isolated
viruses showed that BMY ( 414 from 427 samples) was more widely spread thanCMY (13 from 427 samples) in all areas, Because of wider distribution
and spread of BMY than the othc_r, its effect on seed production, ability to germinate and seed bearing pote:ntial were studied. The results indicated
considerable reduction in seed production, but no effect on germination or
seed bearing ability.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12998_bf22a2d977ce25772fbbec1c7f46da55.pdf
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رضا امید
بیگی
author
سیدمحمد فخر
طباطبایی
author
تقی
اکبری
author
text
article
2001
per
Linseed (Linum usitatissimum) oil is used as anti eczema; it is
moisturizing and anti - intlammatory. The oil contains F vitamin, and is used as laxitive. The main aim of this investigation was to find out the effects of some
variables factors such as N - fertilizer and water supply on growth, seed yield and active substances (fatty oil and fatty acids) of linseed. In this study Linum
usitatissimum, Olajozon cultivar seed provided from Hungary was used. The
statistical design was a splIt-plot arrangement of a randomized complete block
design with four replicates in each treatment. The irrigaUon factor was
considered as the main plot (0, 20 and 60 mm) and N-fertilizer applications (0. 50, 150 and 250 kg/ha) were allocated to subplots. The results indicate that
increasing N - fertilizer to ISO kg/ha significantly increases plant hight, number of branches, number of fruits as well as seed yield. but had no significant effect
on 1 non seed weight. According to the results. a suitable amount of fatty acids
was produced from plants in control plots (without N - fertilier and irrigation).
Supply of water (60mm) increased plant hight, number of branches, number of fruit and seed yield, but had no effect on seed oil content.
Key
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_12999_fe72afdc68fadad1d4e2a41b8e5edb1f.pdf
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عزت اله
فرشادفر
author
محمدرضا
زمانی
author
مصطفی
مطلبی
author
عباسعلی امام
جمعه
author
text
article
2001
per
To evaluate genetic diversity of chickpea lines, screening quantitative indices of drought resistance, and identifying drought resistant lines, 21 lines of chickpea were tested in a randomized complete block design with three replications under two irrigated and rainfed conditions in the research station of Faculty of Agriculture, Razi University of Kermanshah. Based on the potential (Y p) and stress (Ys) yield, quantitative criteria of drougnt resIstance as: mean productivity (MP), tolerance index (TaL), geometric mean productivity (GMP), harmonic mean. (HM), stress susceptibility index (551) and stress tolerance index (STI) were calculated. High significant difference was found among the lines for all the calculated indices, potential and stress yield, indicating the existance of genetic variation, possibility of selection for drought resistance as well as hybridization for the genetic and breeding studies.The highest potential and stress yield, MP, GMP and HM were related to the line FLIP 92-60C. Correlation analysis between indices, potential and stress yield indicated that the most suitable criteria for screening chickpea lines under two irrigated and rainfed conditions were MP, GMP, HM ana STI. With regard to these four criteria and high Y p and Ys' the best drought resistant lines were indentified as the lines number 4,7,8,11,14 and 20. Multivariate biplot indicated that the lines 4, 6, 7, 8, 11 lnd 14 were located next to the vectors of drought resistance indices, as: MP, GMP, HM and 5TI. Distribution of the lines in the biplot space indicated the presence of genetic diversity among the lines for drought stress. Cluster analysis showed the farthest genetic distance between drought resistant lines number 4,6,8,11,14,20 and drought suscetible lines number 1,5,9,13,18 and 21.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13000_ecf8f12ef0ba495f64f0338cc3c939a1.pdf
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علی اکبر صفری
سنجانی
author
شاپور حاج
رسولیها
author
text
article
2001
per
Reuse of wastewater is one of the most effective methods for decreasing environmental contamination and alleviating water deficiency in arid and
semi-arid regions. However, depending on physical, chemical, and biological properties of treated wastewater as a source of irrigation water, soil properties
could change. The main objectives of this study were to evaluate the chemical effects of irrigation with secondary effluent of North Isfahan S_wage Refinery
non-irrigated lands close to the fields as a control. The chemical analyses of soil samples indicated that soil salinity and sodicity had decreased significantly
Effects of Irrigation with Secondary Emuent of North Isfahan Sewage Refinery on Some Chemical Properties. of
Borkhar Region Soils.
A. A. SAFARI 1 AND SHe HAG-RASULIHA 2
1, 2 . Ph.D Student and Professor, Faculty of Agriculture Isfahan University of Technology.
Accepted Oct. 4, 2000
SUMMARY
by irrigation with the effluent for seven years.. Organic carbon and nitrogen, available phosphorus, total nitrogen, ttal phosphorus and cation exchange
capacity of top layer (0-40 cm) of the ilrigated _pils with the effluent have increased considerably. However, pH, NH4-N, NO3+ NO2-N, available K, total K and heavy metals of soils irrigated with the effluent did not change.
Except iron, the levels of heavy metals (specially the levels of Pb and Ni) in the Borkhar region soils were very high Indeed, the level of Ni has got close
to critical.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13001_572c6cb10c4831400fdd1de0e883dd81.pdf
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ناصر علی اصغر
زاده
author
ناهید صالح
راستین
author
حسن
توفیقی
author
عزیزاله
علیزاده
author
text
article
2001
per
The abundance and distribution of arbuscular mycorrhizal fungi (AMF) were evaluated in Tabriz Plain having soil salinity levels ranging from 1.6-162 dS/m. Soil and root samples were collected from rhizosphere of some glycophytes (Allium cepa L., Medicage sativa L., Triticum aestivum L. and Hordium vulgar L.O as well as halophytes (Salicornia sp. and Salsola sp.) and were analysed for spore number in soil, root colonization with AMf and certain physical and chemical properties of soi1. The number of AMF spores was not signifcantly correlated with soil salinity but accumulation of some anions and cations had adverse effects on the number of spores. Cluster analysis of correlation coefficcnt matrice indicated that: the percentage of root colonization, soil, pH, sand and clay percent, and soil available P, rather than
soil salinity and ions concentration. were closley related with spore number. The percentage of root colonization in glycophytes significantly decreased with increasing soil salinity, however, barley and alfalfa roots showed 5-10% mycorrhiazal colonization in high soil salinity (40 dS/m). It may be concluded that the glycophytes could benifit from AMF even in saline conditions.
Halophyte roots were not mycorrhizal but surprisingly. a higher number of viable spores were found in their rhizosphere than nonrhizosphere soil ( 100 and 55 spores per 109 dw. Soil at about 120 dS/m, respectively). Thus halophytes have a positive effect on spore number and survival under severs salinity stresses.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13002_aad1296658fd9c5469d374fbff83a2e1.pdf
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کورش
وحدتی
author
احمد
خلیقی
author
text
article
2001
per
In a trial, effects of different concentrations of auxins as well as
mounding and ringing on walnut stooling were investigated. Concentrations of
IBA + IAA + NAA mixture between 5000 and 7500 ppm, along with
mounding with a mixture of perlite and sand (2: 1) and base wiring of layers led
to the largest number and longest roots. The rooted layers were then lined-out successfully to the second nursery.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13003_0ac2e1e21589c4576d908efa242bdc4d.pdf
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محمد رضا چایی
چی
author
سید محمدضا
احتشامی
author
text
article
2001
per
Density and species composition of weeds are determining factors of weed control. To investigate the critical period of weed control in soybean an expriment was conducted in Eraghi-Mahaleh Research Station 7 Km north Gorgan in Golestan provience in 1998. The expriment comprised 14 treatments which were compared in a Compelete Block Design with 4 replication. In this expriment species composition. density, weed dry matter and their relation to reduction of soybean seed yield was investigated. The treatment were divided in two groups: The first group were kept totally weed free and the second one were kept weed infested up to some defined phonological growth stages of soybean. In weed infested treatments pigweed (Amaranthus retrotlexus) was the dominant weed in early growth season while by the end of the season velvetleaf (Abution sp.) Look over. Weed density followed an undetermined reduction trend. By continuation of weed competition from the begining of growing season, the weed biomass
significantly increased, while their density reduced. Evironmental conditions. soil and competition of neighboring plants (weeds with one another with crop plants) contributed in achieving such results. In contrast as the weed period was longer the weed density as well as weed dry weight significantly deareased. The Soybean seed yield significantly decreased as competition period with weeds lasted longer. An exponential relationship between soybean seed yield and weed dry weight was observed. The peak competition period of weeds in soybean crop was between formantion of the thiro node (V 3) to seventh node (V 7). If weeds are controlled in this period, Soybean would be protected from a significant in se_d yield.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13004_822e283c422d7419de0d70ed632100df.pdf
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حسین
فرازمند
author
غلامرضا
رسولیان
author
خلیل طالبی
جهرمی
author
text
article
2001
per
Red palm * weevil (RPW), Rhynchophorus ferrugineus Ovil. (Col.: Curculionidae) is one of the most important pests of different palms in Asia, North Africa, and Spain. At present it is an internal quarantined pest in
Saravan region, Iran. Several investigations were carried out on the host preference of RPW on 5 date palm varieties including Mazafati, Rabbi,
Halileh, Zardan, pimazoo and a native wild palm (Nannrrhops ritchiana (Grift) Aitch.), during 1997-1998 in Saravan region. Based on the field studies
in the infested date palm groves, the most infested variety was Mazafati. Young palms between 5-20 years old were the most susceptible to RPW. The infestation was directly correlated with the density of date palms too. The attractiveness of volatile chemical components of wild palms for RPW was
significantly less than the orther date palm varieties. Mazafati and Pimazo
were more attractive for RPW than the other varieties. The life span of RPW was maxiumum in Zardan and minimum in Mazfati under the field conditions,
while RPW could,nt complete its life cycle on wild palm. Based on varieties grouping wild palm was introduced as a resistant plant to RPW. Preference rate increased for zardan, Rabbi, Halileh pimazoo and Mazafati respectively. and Mazafati was the most susceptible variety to RPW.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13005_03eaf3c424f41138697630e12eac2bf0.pdf
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علی رضا
نیکوئی
author
جواد
ترکمانی
author
text
article
2001
per
In this study, the effect of three factors namely motor type, irrigation method, and farm size on irrigation costs, were studied, using factorial analysis
of variances method. The needed data applied in the study were collected using Multi Stage Stratified Sampling of farmers during 1375-76 cropping
season. The study sample included 97 wheat producing farmers, electro-pump and diesel motor-pump users, in Shiraz city of Fars province. Results indicated
significant difference between irrigation costs, using electro Vs. diesel motor-pumps and for different rrigation methods, and farm sizes. Also,it was
found that the benefit-cost ratio of substituting the electro-pumps with diesel
motor-pumps for small, medium and large farm sizes was greater than unity.
Therefore, these transfers will be beneficial. But, if there were large distances between nearest electrical power supply and farm land, substitution will only
be profitable with maximum transfer costs of 607403, 12404260 and 21607800
rials for small, medium and large farm sizes, respectively.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13006_26cbe2005f30342b2137c3a8b06e7970.pdf
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حمید
آماده
author
محمود دانشور
کاخکی
author
مجید
کوپاهی
author
text
article
2001
per
Considering the fact that farmers act economically, the price level of agricultural products and their resulting income, play important roles products, selection and cropping pattern. Since farmers take into account the previous prices in their decision makings, in this study in order to analyse the effects of product prices and their variations on the cropping patterns in Khorasan
provlce, an overall and aggregate model was prepared by using MOTAD linear programming method. Besides, the effects of expected income changes on cropping patterns were studied through parametric linear programming method. The resuits indicated that the products with low price variations (i.e. wheat) were excluded from cropping pattern, when the expected income was declining. Some products that have high price variations but high yields remain in cropping patterns. So it was suggested that in order to raise the acreage and production of agricultural products, in addition to price policies, due attention must be paid to non price policies which can increase the yield.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13007_c062401cfde8dc9b78c3034c62c11900.pdf
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حسین
دشتی
author
بهمن یزدی
صمدی
author
سیروس عبد
میشانی
author
محمدرضا
قنادها
author
text
article
2001
per
Marker-assisted selection IS a method recently developed to improve genetic gain in plant breeding. It is based on identification of tight linkages between markers and QTLs, and also on mapping QTLs involved. To map loci controlling heading date and cold resistance in wheat, QTL- analysis was carried out using 96 doubled-haploid lines (DH), derived from a cross between chinese spring (CS) and SQl, with 345 Molecular markers in a partially linkage map, two experiments conducted. In the first expriment DH-Lines were planted in greenhouse using a completely randomized design with 3 replications. Heading date was recorded when three plant had its spike emerged, in each replication. Heading date was considered as days from an arbitary date to the time of heading. In the second experiment each DH-line was
planted in 4 small pots as four replicates (10 plants / pot). seven days
. .
after emergence plants were transfered to cold room under 3-4 c for
five weeks to practise hardening. The pots were then transfered to
freeze chamber to determaine plant survival at four freezing points:
0 0 0 0
-6 c, -8 c, -11 c and -13 c and to find their L T50 as well as electrolyte
leakage (memberane stability) . Electrolyte leakage was measured at
0
-11 c, using a randomized complete block design with 3 replications.
The results indicated that SQl was earlier and more resistant to cold than CS. QTL-Scan analysis revealed the existance. of two QTLs for heading date, one with large effect on chromosome 5A and one with
small effect on chromosome 5B, which all-together explained 51% of
total phenotypic variation in the DH-population. One QTL was also found for cold resistance on chromosome 7 A, which explained 22% and 12% pf the electrolete leakage and LT50 phenotypic variations in the DH-line population respectively.
Key
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13008_de3fe80e578a55ddd2813f65d00b40ac.pdf
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حسین
فرداد
author
حسین
جودکی
author
text
article
2001
per
A laboratory study was conducted in the soil lab of Agricultural Faculty of Tehran University to evaluate S.C.S and VSBR methods for designing granular drain envelopes. A one- dimentional downward flow permeameter was used to test the subsurface drain envelopes.In the first step, blocking of the granular envelopes was evaluated measuring outflow during Ts period and the existing problem distinguished. In the second step, an upward flow permeameter apparatus was constructed to eliminate the pervious apparatus
failures. All tests were repeated the outflow (Qa) and hydraulic head (H) being measured at piezometric locations. Hydraulic gradients were then measured in the soil, envelope materials, and complete system (soil and envelope) to estimate the hydraulic conductivity (K). This study revealed that the envelope materials designed by V.S.B.R method, for which the KdKs ratio was always greater than one (KdKs> 1), exhibit better performance as compared with S.C.S envelopes. In addition V.S.B.R envelopes exhibited better performance in terms of secondary blocking, Iells ratio, outflow and hydraulic gradient in the cover zone.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13009_b33e1d1d49dea5c0641e900200de554b.pdf
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محمد مرادی شهر
بابک
author
text
article
2001
per
Persistency is a heritable economic trait and an important parameter of lactation curve in dairy cattle. Persistency is affected by factors such as animal
genetics, calving, age feeding, season of calving, lactation number, open days, changes in hormone production, and herd production level. In this research
218920 test day records on 23802 cows in a single trait random regression animal model with Gibbs sampling method were used to estimate genetic
parameters and animal breeding values (EBV). Differences in milk production between days 60 and 280, periods 61-160 and 205-305, and the sum of daily
EBV changes were used as persisteney criteria. Estimated heritabilities for persistency criteria were 0.28-0.34 and 0.18-0.26 for milk and fat yield
respectively. Genetic correlation between persistency criteria and 305-d milk yield were varied from 0.15 to 0.89. Correlation between EBV of 305-d milk
yield and persistency criteria were estimated from 0.05 to 0.95. Animals _ rank based on 305-d EBVs were varied from persistency EBVs, which explains that
persistency changes variedly from 305-d milk yield in dairy eattle, allowing selection for this trait.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13010_966e08fbab2c39bb5da35fc9c9d9dd12.pdf
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رضا
بیات
author
حسینقلی
رفاهی
author
علی اصغر درویش
صفت
author
فریدون
سرمدیان
author
text
article
2001
per
This research was conducted to compare EPM and MPSIAC models efficiencies for estimating sediment yield. Taleghan waterr.hed (Tehran province, Iran) with 948.5 km2 area, complex topography and climatic, Vegetative, and geological diversity was chosen as the study area. A part of the essential data were obtained through field survey and labratory analysis, and others from the documents (maps, 1 :50000, and reports) of the Taleghan complete watershed managment study. Digital data preparation was done using digitizer (maps) and keyboard ( other data). All of the required operations such as editing, manipulation, transformation. processing and analysis of data were done by Geographic Information Systems (GIS). The UTM coordinate system was used for aU of the data layers. lvleanwhile, with
digitizing contour line (100 m interval) and interpolation (50x50 m grid), Digital Elevation Model (DEM) of the study area was provided for preparing slope layer as well as other necessary processings and calculations. The related operations of model structures were done on data layers by means of GIS. The results revealed that the MPSIAC model has more efficiency than EPM.
These two models estimated observed annual sediment yields at,98.31 and.
74.96 percent, respectively. Also, mean rate of annual sediment yield was determined at 871 and 666 m3fkm2jyr respectively by MPSIAC and EPM models. It became known that most parts of the watershed have been covered by fourth class erosion condition and a minimum area by one of the first calss.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13011_19edeec877967201fd7d2c76de990d13.pdf
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محمدرضا
سیاهپوش
author
محمدتقی
آساد
author
یحیی
امام
author
عباس
سعیدی
author
منوچهر خرد
نام
author
text
article
2001
per
Selection index is one of the effective methods in indirect selection for a
higher yield. In this study a field experiment was conducted in 1997-98 at two locations (Kooshkak and Badjgah). Twenty five wheat (Triticum aestivum L.)
cultivars were used in a randomized complete block design in each location. Agronomic and physiological traits were measured in five developmental
stages (tillering (stage 1, 51), Stem elongation (52), ear emergence (53), dough
development (S4) and ripening (55)]. The significant traits were distinguished
and the genotypic correlation coefficients with yield, heritability, genotypic coefficient of variation, phenotypic coefficient of variation and genetic
advance were determined. Pathanalysis was done for 23 traits and 14 following traits wre selected:nurnber of kernels per main spike, number of kernels per
tiller spike, number of spikelets per main spike, number of spikelets per tiller spike, number of spike per square meter, percentage of infertile tillers, spike
length spike to stem dry weight ratio in tillers at (55), harvest index, Plant height, NAR21, NAR32, LAD3 and LAD4. The first method used was the
method of Robinson. The best indices resulted from this method had these
spike, number of spikelet per tiller spike. It could be recommended that since the tirst type of selection index is simple and precise, may be suitable for use
combination of the' following traits was used: seed yield, number of kernels per main spike, number of kernels per tiller spike, number of spike let per main
indices were optimum selection indices. In third method economical value was heritibility of traits and in the foruth, economical value was the product of
heritability in advances of desired traits. In the two last methods the
weight ratio of tillers at (55), harvest index, NAR2 and NAR3.This index was similar to the best of the first type of selection index. Third and fourth types of
traits: seed yield, number of kernels per main spike, number of kernels per tiller spike, spike to stem dry weight ratio in tillers at (55), harvest index,
NAR2 and NAR3. The second method was desired gain selection index. The best indicf;s had these traits: seed yield, number of kernels per main spike,
number of kernels per tiller spike, spike to stem dry weight ratio of tillers at (55), harvest index, NAR2 and NAR3. The second methos was desired gain
selection index. The best indices had these traits: seed yield, number of kernels per main spike, number of kernels per tiller spike, spike to stem dry
in applied experiments.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13012_b5a400bb5373bd7ccd513c9c8d617544.pdf
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بهرام
شکاریان
author
غلامرضا
رسولیان
author
پروانه آزمایش
فرد
author
text
article
2001
per
In order to find sources of wheat. resistant to Russian wheat aphid, 58 varieties of wheat and two other cereals (rye and triticale) were screened at
seedling stage under greenhouse conditions. Varieties were infected by aphid and then divided into six groups based on the percentage of seedling survival.
Finally ten varieties were selected and rescreened using two replications. The
results indicated that varieties Yavaras, Mutant arvand, Bezostia, Bafeghi and Alamoot exhibit a high degree of resistance to the aphid.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
32
v.
1
no.
2001
https://jijas.ut.ac.ir/article_13013_529cf77f0b28b4098a4a98e617960c3a.pdf