The combining ability and heterosis were estimated from a number of crosses comprising 10 elite varieties of Zea mays L. obtained from diverse geographical regions. 'AB male bulk' was the best general combiner for grain yield and kernel/row. Two single crosses viz AB male bulk x composite V2' and 'Hemant x CIMMYT Pool 23' significantly outyielded the standard check "Vijay Composite', and the hybrid check 'Deccan 103. for grain yield. The extent of heterosis over better parent and economic heterosis revealed that crosses which had higher estimates of heterosis for grain yield also exhibited higher estimates of heterosis for the major yield components as well.
A field experiment conducted with different N levels, ZnSO4 sulphur, herbicide, organic manures, applied to the preceeding rice crops revealed that the residual effect of NPK plus organic manure particularly FYM significantly increased the available N, P and K contents of soil. The highest grain and haulm yield of black gram was obtained in the 100 per cent NPK plus ZnSO4 applied once in a cropping sequence. The N, P, K uptake was highest in the same treatment.
The influence of integrated nutrient management in irrigated red gram Co.5 was studied over a period of three years during 1990- 1992. Integrated nutrient management such as recommended fertilizer viz., 25 Kg N + 50 Kg P20s/ha + 750 kg/ha of enriched farm yard manure + foliar application of 2% DAP twice (one at flowering and the second 15 days thereafter) + foliar spraying of NAA at 40 ppm at 55 days after sowing recorded increased yield in redgram under irrigated condition.
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