Vol. 11, Issue 8 (2022)

Author(s):
Laxmi, Basavanneppa MA, Koppalakar BG, Vishwanatha S and Balanagouda SR

Abstract:
The field experiment was conducted at the Agricultural Research Station, Siruguppa during rabi 2020-21 to study the response of maize (Zea mays L.) genotypes to nitrogen levels during rabi under irrigated conditions. The experiment consisted of twelve treatment combinations of four genotypes viz., V₁: RCRMH 2, V₂: RCRMH 3, V₃: RCRMH 4 and V₄: NK-6240 and three nitrogen levels, F₁:225 N kg ha^-1, F₂: 187.5 N kg ha^-1 and F₃: 150 N kg ha^-1 these were replicated thrice in split plot design. The genotype NK-6240 recorded significantly higher number of cobs plant^-1 (1.38), cob length (17.94 cm), cob girth (17.54), cob weight (289.99 g and 210.64 g cob^-1 with husk and without husk, respectively), number of grains row^-1 (30.08), hundred seed weight (30.81 g), grain yield plant^-1 (164.50 g), shelling percentage (78.03%), grain yield (7659 kg ha^-1), stover yield (9449 kg ha^-1), harvest index (44.75), gross returns (Rs.114311 ha^-1), net returns (Rs. 71801 ha^-1) and B:C (2.68) and it was on par with the genotype RCRMH 4. Application of 150% N kg ha^-1 recorded significantly higher number of cobs plant^-1 (1.36), cob length (17.76 cm), cob girth (17.26), cob weight (291.41 g and 215.85 g cob^-1 with husk and without husk, respectively), number of grains row^-1 (29.97), hundred seed weight (29.42 g), grain yield plant^-1 (171 g), shelling percentage (79.15%), grain yield (7664 kg ha^-1), stover yield (9592 kg ha^-1), harvest index (44.38), gross returns (Rs. 114497 ha^-1), net returns (Rs. 71503 ha^-1) and B:C (2.66) compared to rest of the N levels. Hence, planting of maize genotypes NK-6240 and RCRMH 4 with application of 150% N kg ha^-1 was found more productive and remunerative in rabi under irrigated condition.