-
محمودکلباسی
author
text
article
1994
per
Zayandehrud river is the major blood vein of Isfahan plain and its water quality is of prime importance to municipal, agricultural and industerial development in the area. Spatial and temporal changes of water quality in this river were monitored by analysis of seasonal samples taken from 14 stations along the river path, during a 3 year period. Electrical conductivity, pH and concentration of P, SO4 , Cl, HCO3, Ca, Mg, Na, K, Fe, Zn, Cu, Mn, Co, Cd, Ni, Pb, Ag and Cr were determined in water samples. Results incicated a gradual incrase in electrical conductivity and concentration of Ca, Mg, Na, K, Cl, SO4 and HCO3 from station no. 1 (Morgan) to station no. 10 (Ziar) and then a much sharper increase from station no. 10 to station no. 13 (Varzaneh) and then a slight decrease to station no. 14 (Gavkhoni). Water pH was alkaline with a minimum of 7.6 in station no. 10 and a maximum of 8.0 in station no. 13. Concentration ot P was negligible up to station no. 8 then increased sharply to a maximum of 3.2 mg/L in station no.9 or 10, then decreased drastically to station no. 13. Concentration of heavy metals were generaly low and did not exceed 0.2 mg/L in water samples. Concentration of Ni, Co, and Pb were very low upto station no. 12 (Ajieh), then increased sharply upto station no. 13 and decreased slightly to station no.14. Concentration of other heavy metals including Fe, Zn, and Cr, changed irregularly along the river path.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16174_b18662e6e933dd83ecc218ae3ebb762b.pdf
-
عبدالحمید
رضائی
author
حسن
فرحبخش
author
مهدی
کریمی
author
text
article
1994
per
The rapid method for predicting crop growth rate in sorghum was derived based on the evaluation of 3 cultivars, namely Bravo L (late maturing), and Bravo E, and NK 2505 (early maturing), in 3 planting dates (30 April; 14 and 28 May, 1990’ in Research Station, College of Agriculture, Isfahan University of Technology. According to the results obtained, variation in grain yield and crop growth rate were at the same direction, and cultivars with a higher crop growth rate at 50% flowering stage had higher yields. The highest dry matter for the cultivars in all the planting dates was accumulated after 1500 growing degree days. Therefore, according to the high correlation coefficient between the average actual crop growth rates and the highest values of dry matter accumulation, the following equation was revealed to be the best predictor for crop growth rate in sorghum.
Average crop growth rate= -2.28+ o.0093 (Dry matter accumulation after 1500 growing degree days).
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16175_e88fd6e6bd00db9c629da171f558525a.pdf
-
رحیم
هنرنژاد
author
text
article
1994
per
In 1989 six Iranian cultivars were crossed in a fuil-diallel crossing system. In the following year parental lines and the Fl-hybrids were sown in a randomized block design and six quantitative characters were evalueted. Because three reciprocal crosses failed, results were analyzed by means of the haif-diallel method. The results showed significant differences between genotypes and a high general and specific combining abilities for the investigated characters of parental cultivars and their Fl-hybrids..
Calculations and graphic interpretations of the results of diallel crosses revealed that characters such as tillers per plant, plant height and the length to breadth ratio of brown rice were mostly controlled by additive gene action and through partial dominance. These characters have a high heritability and therefor selection for these characters may be succeed.
Genetic control of characters such as earliness, length of panicles, and percentage of empty grains per panicles is exerted by over-dominance. Because of a high
amount of non-additive gene action and, thus, low heritability of these characters, the chance of successful selection for those characters is not very high.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16176_b4c30ff12639fa3a98cb8d533089b323.pdf
-
رحمان رحیم
زادگان
author
text
article
1994
per
Lawn wal planted in three lysimeters, and cotton was planted in two lysimeters in order to evaluate its crop coefficients ii Isfahan. The evapotranspiration of lawn and cotton were measured for two years on daily basis . The crop coefficient of cotton for the growing season, monthly crop coefficients, and crop coefficients for 10 days intervals were calculated using evapotranspiration of lawn as the potential evapotranspiration and evapotranspiration of cotton as the actual evapotranspiration. The seasonal crop coefficient of cotton was computed 0.71 in Isfahan. The maximum crop coefficient is 1.02 , and occurs 100 days after planting and 10 days after effective cover.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16177_1dcc62223927efe9434af7683f8a9e97.pdf
-
سکینه شفاء
الدین
author
بهمن یزدی
صمدی
author
text
article
1994
per
To determine genetic and geographical diversity in indigenous wheat collections from central regions of Iran, 1091 collections from Isfahan, Chahar Mahal Bakhtiari, Fars, Kerman and Yazd were studied in 1990-91 in the Experimental Field, College of Agriculture, Karaj, Iran. Each entry was planted in a 3 m row. Rows were 5 m apart. After every 50 entries, a row of Karaj-1 was planted as check. Traits studied were: flowering time at 50% flowering, plant height in Cm,.biological yield in Kg, spike length in mm, and number of seeds per spike.
Statistical analyses were done for each trait. Regions and genotypes were grouped through cluster analysis. Analysis of variance showed that regions were significantly different for all rtaits under study. Cities of the regions were grouped into nine clusters. It was found that genetic diversity follows geographical diversity, closely. Significant correlations were found between yield and all other traits, except spike length.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16178_f504287c3b1945c2eabe524ea9d2df66.pdf
-
علیرضا
طالعی
author
سعید
نورمحمدی
author
text
article
1994
per
In hybridization progromme for wheat improvement, it is important to select parents which are able to transfer useful genes. In this research, broad and narrow sence heritability values were estimated for 10 important yield related characters in three different crosses. In each cross, six basic generations consisting of P1, P2,F1,F2,Bcl and Bc2 were made. Each generation were sown in a different plot. Thirty plant per plot were selectcd in random and scored. Broad and narrow sence heritabilities were estimated using generation analysis of variance and calculating environmental, additive and dominance variances by Hayman,s 6-parameter model. The highest broad sence heritability value was 86.2% for seed yield / plant in the first cross and the lowest value was 14.6% for straw yield/plant in the second cross. The highest narrow sence heritability value was 57.3% for seed yield/Plant in the first cross and the lowest value was 3.4% for straw yield/plant in the secon-d cross.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
1
v.
0
no.
1994
https://jijas.ut.ac.ir/article_16179_05c3313dddbba10c15d5c8536302bbca.pdf