Effect of planting dates and different levels of nitrogen on seed yield and yield components of nuts sunflower
Soleymani, A.; Shahrajabian, M.H.
Research on Crops 13(2): 521-524
2012
ISSN/ISBN: 0972-3226
Accession: 070685527
In order to study the effect of planting dates and different levels of nitrogen on yield and yield components of nuts sunflower (var. Doursephid), an experiment was conducted in 2009 at Experimental Field, Mahmoodabad region, Isfahan. A split plot layout within randomized complete block design with three replications was used. Main plots were planting dates May 5, May 20 and June 5 and sub-plots were nitrogen levels 0, 150, 200 and 250 kg N/ha. The results showed that the effect of planting date was significant on stem diameter, head diameter, number of grains per head, grain yield and biological yield. The effect of different levels of nitrogen was significant on plant height, stem diameter, biological yield and harvest index. The interaction between planting date and nitrogen had significant influence on plant height, stem diameter, biological yield and harvest index. The highest stem diameter, head diameter, grain yield and biological yield were obtained in May 5, and the highest plant height, stem diameter, head diameter, number of grains per head, 1000-grain weight and grain yield were obtained from usage of 200 kg N/ha. Results showed that 200 kg N/ha and May 5 were suitable for this variety in this region.