Effect of levels of major nutrients with seed setting treatments on yield and economics of sunflower (CO 4)

摘要

Field experiments were carried out during summer and kharif 1997 at Tamil Nadu Agricultural University Farm, Coimbatore to study the influence of NPK levels and seed setting treatments on yield and economics of sunflower var CO 4. Among NPK levels, N:P:K at 80:40:40 kg ha1 recorded higher seed yield. With respect to seed setting treatments, 0.2 per cent borax + 2 per cent DAP spraying at ray floret opening stage recorded higher seed yield. The treatment combination of N:P:K at 70:35:35 kg ha~(-1) with seed setting treatment of 0.2 per cent borax + 2 per cent DAP spray gave higher BC ratio of 2.95 during summer 1997 and 2.60 during kharif 1997 and it was followed by the treatment combination N:P:K at 80:40:40 kg ha1 with seed setting treatment of 0.2 per cent borax + 2 per cent DAP spray which gave BC ratio of 2.91 during summer 1997 and 2.55 during kharif 1997.