جستجوی مقالات مرتبط با کلیدواژه « Nitrogen levels » در نشریات گروه « اقتصاد کشاورزی »

In order to investigate the effect and sufficientcy of nitrogen and seed rate on yield of seed and oil and yield component of rapeseed cultivar Zarfam, a field experiment was conducted in a factorial based on randomized complete design with three replications in agricultural and natural resources research center of Lorestan province, Iran during 2004-2006(In irrigation conditions). In this experiment five urea levels of 0.5R, 0.75R, 1.25R and 1.5R (R=recommended rate of 285 kg/ha) were assigned to main plots and four seeding rates (6, 8, 10 and 12 kg/ha) were assigned to subplots. Analysis pooled over the year of experiment showed that grain yield was not significantly different among nitrogen levels. The result, also, showed that the effect of none of seeding rates was significant. Interaction effect of nitrogen level of 1.5R and seeding rate of 8kg/ha significantly had the highest seed yield of 4686.5 kg/ha.The number of silique per plant and plant height showed significantly positive correlation with grain yield Oil percentage had significant positive correlation only with 1000 grain weight. between grain yield and oil percent was significant negative correlation. It is concluded that nitrogen level of 0.5R and seeding rate 6-8 kg/ha is suitable for the area under study.

In order to study the effects of planting pattern and nitrogen amounts and their interaction on yield and yield components of spring safflower cultivar IL111 in Eghlid Agricultural Research and Natural Resources Station was done in split plots as a randomized complete block design with 15 treatments and 3 replications during 2008-2009. The main plots were planting pattern (row distance 30، 45 and 60 cm) and sub plots were five levels of nitrogen (0، 40، 80، 120 and 160 Kg/ha of pure nitrogen) as urea. In this study some plant properties such as seed yield، seed number in head، the number of head in plant، 1000 seed weight، oil seed percent، oil seed yield، biological yield، seed protein percent and leaf nitrogen percent were measured. The results show the highest seed yield (2229 kg/ha) and the highest oil yield (691 kg/ha) were made with 60 cm row distance and 80 kg/ha of pure nitrogen، That was 54 and 59. 2 percent higher than control. The highest number of seed in head (88. 67) that was the most important yield component was obtained from 60cm row distance and 80 kg/ha of pure nitrogen. The highest oil seed percent (31. 7) was obtained from 60cm row distance and 40 kg/ha of pure nitrogen and highest protein seed percent (14. 62) was obtained from 60cm row distance and 160 kg/ha of pure nitrogen. The difference between oil and protein percent show an opposite relation when increasing nitrogen fertilizer levels. By considering the our results، 60cm row distance and 80 kg/ha of pure nitrogen for this safflower cultivar in similar conditions to the experiment is suitable.