Influence of plant growth regulators, chemicals and nutrients on growth, yield and yield components in safflower (Carthamus tinctorius L.).

摘要

A field experiment was conducted during rabi of 2000 to study the effect of plant growth regulators, chemicals and nutrients on growth, yield and yield components in safflower. The experiment consisted of two growth promoters (miraculan and NAA), one growth retardant (lihocin) and two chemicals ( beta -naphthol and salicylic acid) and two nutrients (FeSO₄ and KNO₃). The results revealed that the seed yield was significantly higher with miraculan (2000 and 1000 ppm) followed by lihocin (1000 and 500 ppm), NAA (100 and 50 ppm), beta -naphthol (20 and 10 ppm) and FeSO₄ (1.0 and 0.5%) as compared to control. All the yield contributing characters viz., number of capitulum per plant, seed weight per plant, capitulum size and test weight except harvest index increased due to plant growth regulators, chemicals and nutrient treatments and all these parameters showed a significant positive correlations with seed yield. The data on benefit:cost ratio indicated that it was high in lihocin at 500 and 1000 ppm (2.871 and 2.402) followed by miraculan at 1000 and 2000 ppm (2.677 and 2.423) and beta -naphthol at 10 and 20 ppm (2.567 and 2.306).