Effect of variety, sowing time and integrated nutrient management on growth, yield attributes and yield of summer maize (Zea mays).

摘要

In a field experiment conducted during the 1999 summer season in Chhattisgarh, India, the treatments comprised of 3 maize cultivars (Mahyco-1765, ProAgro-3436 and Nutan-581); 3 sowing dates (22 April, 2 May, and May 12) and 3 levels of integrated nutrient management i.e. recommended dose of 120:60:40 kg N, P2O5, K2O/ha (F100), 90 kg N/ha + 6 t FYM/ha + 45 kg P2O5 + 10 kg K2O/ha (F75O25) and 60 kg/ha + 12 t FYM/ha + 30 kg P2O5/ha (F50O50). ProAgro-3436 recorded the tallest plant and more girth and it was significantly higher than Mahyco-1765 and Nutan-581 both at 60 days after sowing and at harvest. The cultivars had no effect on the number of leaves on the 30th day, however, on the 60th day, Mahyco-1765 and ProAgro-3436 were at par and significantly higher than Nutan-581. Leaf area index was significantly higher in Mahyco-1765 than ProAgro-3436 and Nutan-581 except on the 60th day where Mahyco-1765 and ProAgro-3436 were at par. Positive correlation between LAI and number of leaves was observed. Dry matter production on the 40th day was significantly higher in Nutan-581 followed by ProAgro-3436 and Mahyco-1765. Mahyco-1765 gave significantly higher cob yield and yield attributes compared to ProAgro-3436 and Nutan-581. Sowing on 12 May produced significantly higher cob and fodder yields with other yield attributes such as diameter of cobs, length of cob and number of grains per cob than earlier sowing 22 April and 2 May. F50O50 recorded the highest cob yields, harvest index and number of rows per cob.