The effect of sowing date on yield and its components of safflower genotypes under Urmia climatic conditions

Subject Areas : crop production

علیرضا عیوضی ¹ ( مرکز تحقیقات کشاورزی ارومیه )

Received: 2010-07-29 Accepted : 2011-09-16 Published : 2011-01-08

Keywords: Genotypes, Grain yield, Safflower, Sowing date,

Abstract :

To investigate the effects of planting date of safflower genotypes under Urmia climatic conditions, an experiment was conducted in 2009-10. A factorial experiment was arranged in Randomized Complete Blocks Design with four replications. Four sowing date (April 21, May 5, May 21, June 5) and five genotypes (IL-111, S-541, PI-250536, PI-250537, Syprus bregun) were established levels as second factors. Results of analyses of variance showed that the effect of planting date were significantly differenct for traits of grain yield, number of grain per boll, number of bolls per plant, harvest index and oil grain percentage. The grain yield of first, second, third and fourth sowing dates were 223.12, 197.65, 185.71 and 173.99 gr/m2, respectively. The highest fertile boll, kernel per boll and 1000-kernel weight were allocated for PI-250537, S-541 and Syprus bregun genotypes in the first planting date, respectively. Interaction between planting date and genotype on lateral branch, total dry matter, grain yield, number of bolls per plant, number of grain per boll, harvest index, oil percentage and 1000-kernel weight were meaningful (P 0.01). Correlation coefficients between traits showed that there were positive significant differences for number of grain per boll with grain yield. Based on these results, early spring planting date will be move suitable than other dilatory planting.

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