-
حسین
توکلی
author
مهدی
کریمی
author
سید فرهاد
موسوی
author
text
article
1989
per
To study the effects of different irrigation regimes on vegetative and reproducitve development of corn (Zea mays, L.),hybrid S.C. 704, an experiment was conducted in Experimental farm of College of Agriculture, Isfahan University of Technology in 1987. The irrigation treatments were: 11= irrigation after 70 mm, 12= irrigation after 100 mm, 13= irrigation after 160 mm evaporation from Class A pan. The design was complete randomized blocks with four replicates.
The results showed that grain yield of Ii is significantly greater than 12 and 13• Lesser kernels per ear and smaller kernels in 13 caused 37% reduction in grain yield with respect to I. Smaller ears in I. caused reduction of kernel number and redution of leaf area index and leaf area thickness caused smaller kernels to form.
The effect of three irrigation regimes on harvest index was not significant, and this index was about 0.51. Water use efficiency for grain yield and biological yield-of I. was less than 12 and 13 On the average, 1.04 Kg of grain and 2.09 Kg of biological yield was obtained with 1.0 m3 of water?
Leaf dry weight, stem weight, and total aerial part of I was less than and I2• Also, depth of maximum root density and horizontal root development in I was significantly more than I. and 12• But, maximum root depth in 13 was less tan I. and I.,. In general, irrigation of corn after 70 mm evaporation from Class A pan seems to e suitable Isfahan region.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15849_924f397ac9dc4687164ed386ea4bbb79.pdf
-
عبدالرضا باقری کاظم
آباد
author
غلامحسین
سرمدنیا
author
شاپور حاج
رسولیها
author
text
article
1989
per
This experiment was conducted to study salt tolerance of sainfoin populations (Onobrychis viciifolia Scope.) during seedling stage. Sodium chloride was used for inducing salt stress. Sainfoin seed populations from Tabriz, Zanjan, Sabzevar, Faridan, Makoo, Kordestan and Hungary were used in this study.
Sainfoin seedlings grew up to water potential of—O.57 MPa (—5.7 bars). Plant height, leaf, shoot and root length, root dry weight as well as leaf area decreased with increasing salinity. During the seedling stage the most tolerant and sensitive populations were Zanjan and Sabzevar,respectively
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15850_02172496ca8a9da4cd416894d994cb53.pdf
-
حسن رضا
اعتباریان
author
text
article
1989
per
Downy mildew of radish caused by the funqus Peronospora parssitica (Pers. ex Fr.) Fr. Affecting vegetable crops in Varamih and Shahre—Ray area of Iran. Symptoms of the disease and morphology of the fungus were investigated and presented in this paper. Oospore were found abundantly in necrotic or chLorotic leaves and seed sheath, but not in green tissues.
Field experiments were conducted to-evaluate eight fungicides namely Thiophanate methyl, Cooper hydroxide, Cooper oxychloride, Carbandazim, Captan, Zineb, Maneb and Dodin against radish downy mildew. Cherybell and Champion radish cultivars were used in the present investigation. The results indicated that spraying once with zineb and Maneb were most effective.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15851_cf9fe4c2d23ed7efcff4f35b81e87454.pdf
-
عبدالحمید
رضائی
author
ک.ج.
فرای
author
text
article
1989
per
Nine isolines of oats (Anen6 0ativa L.), developed on the Lang variety background by backcrossing, were tested in 18 environments in Iowa, USA. Isolines and Lang were evaluated ‘for four characteristics of grain yield mean across environments, response to improving environments, deviations from regression, and coefficient of determination. The latter two parameters estimate stability of productivity.
The isolines varied, significantly for’ plant heignt, heading date, test weight, and harvest index, but the ranges for these traits were small. Also, genotvoes differed significantly for grain yielc One isoline yielded significantly more, and four yielded significantly less, than Lang. The genotype X environment Eor this set of lines was largely due to linear responses of genotypes to different environments. I 501537, with a nonsignificait b-value and deviation from regression, would be superior for yield in both high-and low-productivity environments, and P1 501535, with the lowest b-value and a small deviation from regression, was the most stable isoline. Linkage between the genes for resistance to different races of the pathogene and those for expression in yield and agronomi’c traits in the oat isolines, seems to be the primary cause. of deviations observed.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15852_d7cf79601c45f59e01ed59db9cc28b7a.pdf
-
محمد کریم
اکبر
author
قاسم
دارابی
author
text
article
1989
per
The bioeconomic effects of the economic traits on the production systems were studied in three genetic groups (B1,B2, B3) and two sexes (S1,S2) of broiler chickens. The genetic groups were the final products of three integrated or semi - integrated commercial and research production systems.me traits under consideration were early growth rate, feed conversion and carcass quality.
Male broilers were superior over the females in early growth rate and feed conversion. Males were also superior in most carcass quality taits, including fat percentage. Exceptions were percent carcass to live weight and percent breast to carcass in which females were superior. The best and the poorest early growth rate were in B2 and Bi, respectively. Feed conversion was not different in B2 and B3 but it was higher in Bi. Most carcass quality traits including percent carcass to live weight, percenthreast to carcass, percent fat to carcass and percent of other parts were the same in 82 and B3, but were lower in B1. B2 and B1 had the highest and the lowest quality in carcss weight, treast weight, leg weight and weight of the other parts. B3 was intermediate in these traits. No significant difference was found in other carcass traits, including percent leg to carcass and fat weight among the genetic groups.
The results from this study generally indicated the bioeconomic superiosity of the B2 production system over that of 83. Both systems were superis over the B1 production system.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15853_2d2bbde5218ccdf1063407166646385e.pdf
-
علی
نیکخواه
author
محمدرضا
شریفلو
author
text
article
1989
per
There are about six million native Cattle in Iran that their characteristics have not been studied yet; therefor, their genetic potential is not properly recognized. Designing fundemental programs for improving the breeding performance of these cattle would be feasible, if their potentials are recognized.
In this work, milk and fat yield, fat percent, reproductive performance and growth rate of Sarabi cattle in the Hakimieh Station and College of Agriculture were studied for five years. Sarabi cattle were reared in the open-shed and the condition of treatments in both stations were the same. Records were standardized for milking days and statistically analyzed. The results are as follows:
1) Conformation: Neck, Head and Forehead length were 45.30, 47.50 and 20.00 cm., respectively. Forehead width in areas of poll, median and between eyes were 18.10, 15.97 and 19.23 cm., in the same order. Height in withers, Barrel girth, Heart girth, ‘oin width, Feet and Legs hight were 122.12, 206.00, 176.98, 68.16 arid 71.94 cm., respectively.
2) The overall mean of actual milk yield in the Hakimieh and the College Stations were 1281.3 and 566.4 and their ranges were 110.7 to 4907.2 .and 98.0 to 1880.Kg. The adjusted milk yield for 305—day were 1887.78 and 1252.61 with the standard deviations of 999.13 and 539.05 Kg. Average fat percent in the Hakimieh station was 4.71, which is close to that of Jersey Breed. Length of the Lactation period was 163.10 day or Hakiniieh and 118.03 days for the College stations. Individual milk yield curves varied substantialy, which may he due to genetic and environmental. factors.
3) The average Age of Heifers at first calving was 35 months with minimum 27 and maximum 48 months. Length of gestation, days open and calving interval were 283.2, 73.2, and 365.6 days, respectively.
4) The average weight of male and female calves were 26.09 and 24.95 Kg. in this study which is equal to those of the Jersey breed. Phenotypic correlation cofficients among birth weight and three month weight and yearling weight were 0.79 and 0.74 respectively. Average daily gain of calves were 460 and 780 gm. during the first three-month and third three-month of age respecfively.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1989
https://jijas.ut.ac.ir/article_15854_04ff84f3b3484240c1ad12e2e53995a5.pdf