Response of hybrid rice varieties to nitrogen, phosphorus and potassium fertilizers during dry season in West Bengal
Bhowmick, N.; Nayak, R.L.
Indian Journal of Agronomy 45(2): 323-326
A field experiment was conducted in dry (boro) season of 1996-97 and 1997-98 on a lowland alluvial soil (Entisol), to study the performance of hybrids ('CNHR 2' and 'CNHR 3') and high-yielding varieties ('IR 36' and 'IR 64') of rice (Oryza sativa L.) at 5 levels of fertilizer (N0 P0 K0, N120 P60 K60, N150 P75 K75, N180 P90 K90 + 30 ZnSO4 (kg/ha) of nutrition. 'CNHR 2' recorded the maximum panicles (413.4/m2), higher number of filled grains/panicle (111.0), moderate test weight (21.0 g) and gave the highest grain (7.1 tonnes/ha) and straw (6.95 tonnes/ha) yields. Grain and straw yields increased by increasing level of nutrition for hybrids up to N180 P90 K90 + 30 ZnSO4 kg/ha and for high-yielding varieties up to N120 P60 K60. Highest benefit:cost ratio (BCR) was obtained at N150 P75 K75 and hybrid 'CNHR 2' gave the highest BCR.