Determination of growth habit in different safflower genotypes
2006
Hassan Omidi, Amir | khosravi, Ali
In order to study of growth habit in different safflower genotypes ,200 safflower were evaluated at Research Farm of SPII,in summer of 2004-2005. Seeds were sown by hand on an inter-row spacing of 0.5m and with an intra -row spacing of 5cm,each plot consisted of rows 3m long. After emergence, manual thinning was used to obtain normal density. For the experiments , 70kg/ha of P2O5 as ammonium phosphate and 25kg/ha of nitrogen as urea were supplied prior to sowing and 30kg/ha of nitrogen as urea at the start of stem elongation. Weeds were controlled by manual weeding before stem elongation. Irrigation was applied at 7 stages: After emergence, stem elongation, bud formation, beginning of flowering, 50% of flowering, finishing of flowering and seed filling .During the growth period some important traits were recorded such as: dates of: germination ,stem elongation, flowering time and maturity date. The results showed that the genotypes can be classified in two groups:1- The genotypes that remain in rosset stage because of obscence of cold condition(no vernilization) called winter types..2- The genotypes that pass the rosset stage called spring types.
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