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ogen Levels on Root Density, Nutrient Uptake and Grain Yield of August Sown Hybrid Maize (Zea mays L.)
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A field experiment was conducted at Punjab Agricultural University Ludhiana, during late Kharif 2009-10 to study the effect of different irrigation regimes (IW/CPE ratio 0.50, 0.75, 1.00 and 1.25) and nitrogen rates (100, 125, 150 and 175 kg N ha-1) on ischolar_main growth, nutrient uptake and yield of August sown hybrid maize. The irrigation regimes I1.25 (3 irrigations) and I1.00 (3 irrigations) produced the grain yield of 83.1 and 81.2 q ha-1, respectively, which was significantly higher than the grain yield observed under I0.75 (2 irrigations) and I0.50 (1 irrigation). Root density was higher in surface soil layers i.e., 0-15 and 15-30 cm soil profile under adequate irrigation regimes (I1.25 and I1.00) which was statistically at par with each other but reverse trend was observed in deeper layers where ischolar_main density was higher under deficit irrigation regimes. Nutrient uptake by maize i.e. N, P and K was also higher at higher irrigation regimes. Among nitrogen rates, N150 and N175 being statistically at par with each other gave significantly higher grain yield over N125 and N100. Similar trend was observed for ischolar_main density in different soil layers. Total N, P and K uptake was also higher at N175 which was significantly higher than other nitrogen levels in case of total N and P uptake whereas it was statistically at par with N150 in case of total K uptake.
Keywords
August Sown Hybrid Maize, Irrigation Regimes, Nitrogen Levels, Root Density, Nutrient Uptake
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