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شهلا
محمودی
author
text
article
1988
per
The degree of homogeneity of soil parent materials is estimated by similarity index method in 4 pedons from Jafarabad, Arnirabad, Karaj, and Shurghaleh series in Karaj-Abyek area. In order to determine the similarity Indices the soil samples have been treated for carbonate, gypsum, organic matter and soluble salt removal in the laboratory. After these eliminations, sand and silt fractions(20-2000 micron) have been separated into nine different size fractions by wet seiving(i.e.,1000,500,345, 250,177,125,88,63,2omicrons). The relaitive weight and weight percentages of different
fractions were calculated based on oven dried samples at 105 Computation of the
indexes is based on summation of the minimum weight percentages of nine fraction groups between two adjacent samples. The index of 100 or close to 100 means a high similarity, whereas the index of 0 or low means no or very little similarity. The indexes obtained for the studied profiles ranges between 41.9 to 95.4(both for Karaj serie). Indexes are generally very low but mostly in a good agreement with the litho logical discontinuities. There are however, some discrepancies such as in the surface horizon of Jafarabad profile and the whole profile of Shurghaleh serie. Considering the Jafarabad profile, the dissimilarity is probably due to mixing of.the surface material as a result of sedimentatioEl and/ or erosion. Therefore, the sirnilarity index is probably more accurate. In Shurghaleh profile, the difficulties in determination of the amount of primary and secondary gypsum and carbonates are probably the main reasons for non-accurate determination of lithological discontini uities.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16148_07cc409ff5ffc419b302dbdc51efb67a.pdf
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ناصر مجنون
حسینی
author
پروفسور جی .اس.
کولار
author
text
article
1988
per
A field experiment was conducted during 1983 and 1984 to find out the most suitable weed control measure and intercrop combination of pigeonpea(Cajanus Cajan CL. )Millsp)and Green gram(Vigna radata(L.)Wilczek)for higher yield and suppressing the weeds effectively.
Growing one row of mungbean in pigeonpea spaced 50 cm produced significantly higher total equivalent yield of pigeonpea and smother the weeds effectively as compared with pigecnpea grown pure spaced 50 cm.
Increasing the row width of pigeonpea to 75 cm to plant one row of mungbean as intercrop did not help in increasing the total equivalent production of pigeonpea and there was also lesser weed suppression due to availability of more space for weeds to grow. Planting two rows of mungbean in pigeonpea spaced 75 cm helped to smother weeds effectively but excessive population of mungbean created an intense competition for pigeonpea,which in turn,suffered badly. The bioefficacy of Oxadiazon and Fluchloralin was comparable to manual weeding twice and proved effective against both grassy and broadleaf annual weeds.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16149_7c14fd41ab24b876e862064a2f5a30dc.pdf
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حسن رضا
اعتباریان
author
text
article
1988
per
Barleycv.cebada capa which carries the pa 7 gene for resistance is suscoptible to raccs , F,BRS 76.12 and BR/EST of p.hordei otth . at5°C and is resistant to these races at highcr trpcrature (25C). In comparison cv. C11243 carrying the P9, resistance gene is susceptirilc at hiqher temperature (25°C) and resistant at 5C.
CV. Ribari which carries the Pa3 gene was resistant to race F and susceptible to races BRS76.12 and BR/ESTat all temperature but the susceptibility of Rika 1 to these races was not affected by changing the temperature.
Two temperature-sensitivie cultivars Cebada Capa and C11243 give an intermidiate reactlr)ri a temperature of 15°C.
Pre—inoculation temperature had no effect on infection type of barley varieties
The results of studies on.flaq leaves of C11243 and Rika 1 which was inocu1a’-d wish thr races f P.hordei at 25°C showed that the relative number and of rst was s1iqh+-y less nd the chiorotic aeas around pustules in some
cases were greater than those of the other leaves of the Plants
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16150_45eb20a57174d3aff7e26d5e5f61ee04.pdf
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غلامعلی
رنجبر
author
مهدی
کریمی
author
محمد رضا خواجه
پور
author
text
article
1988
per
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16151_40ad39a5f3ab87f3f9e33141a2d74fe8.pdf
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سیروسی
عبدمیشانی
author
جمشید جعفری
شبستری
author
text
article
1988
per
An experiment was conducted with 35 improved Iranian and foreign wheat cultivars under normal and limited irrigation in order to evaluate their relative drought resistance. The experimental design was a split-plot with four replications with irrigation regimes as main plots and the cultivars as sub-plots. Characters studied were grain yield, 1000-Kernel weight, no. of kernels per spike, no. of kernels per spikelet, no. of spikes per unit area, days to head emergence, and plant height. The experiment was fall planted. Irrigation increased grain yield, 1000— kernel weight, plant height, no. of kernels per spikelet, and no. of kernels per spike. Coefficients of correlation were calculated among several characters. The stress and nonstress yield potential under normal irrigation can give some indication of performance of cultivars under limited irrigation. The performance of cultivars with limited irrigation was positively correlated with drought resistance index
(r=0.63**).
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16152_8a3e6f2a2ca667d821461b33bacafb53.pdf
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علی
نیکخواه
author
text
article
1988
per
Livestock feed is a major concern in field of Animal Production. Currently in Iran, as it is calculated, the avalcable feed resources are sufficient to provide about 50% of the standard nutrient requierments of the existing livestock. Aplausible reason for the current low level livestock performance in the.country is the shortage of feed resources, and use of unbalanced ration.
The main objective of this study was to increase the available livestock feed rerources through the use of the unconventional feed material, such as agricultural by-products and crop residues. The secondary objective of the study was to establish procedures to manufacture molasses-urea blocks by applying simple and appropriate techniques which are applicable in Villages. The manufactured—solidified blocks were composed of wheat and rice rtraw, tea waste, rice hulls, molasses,urea,.• quicklime, cement and salt. The hardness of the blocks was measured by a penetrometer. The consumption level was measured by direct observation of the cattle.
The results of thes study indicate that, the manufactured molasses—urea blocks can be handled, stored, transported and distributed easily by the farmers, and consumed by the livestock. The mean hardness of the blocks in the different treatments varied from 8.44 ±1.48 to 53.41±8.59 Kg/cm2. The mean consumption level (eating-and-or lecking) of the blocks in the different treat ment Varried from 0.845 to 1.550 Kg per Animal per day.
Iranian Journal of Agriculture Science
پرديس کشاورزي و منابع طبيعي دانشگاه تهران
3و4
v.
0
no.
1988
https://jijas.ut.ac.ir/article_16153_e379e2606c7ed6ecbf6c04514dfacfa9.pdf