GROWTH AND YIELD OF BORO RICE UNDER SYSTEM OF RICE INTENSIFICATION WITH DIFFERENT WATER REGIME AND MANURAL STATUS

Abstract

A field experiment was carried out at Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during the period from December, 2011 to May, 2012 to study the growth and yield of Boro rice under system of rice intensification with different water regime and manural status. The experiment consisted of two factor as three water regime viz., waterlogged condition, saturated condition and alternate wet and dry condition in main plot and six manure and fertilizer combinations viz., cowdung 100%, compost 100%, chemical fertilizer 100%, 50% chemical fertilizer + 25% compost + 25% cowdung, 50% chemical fertilizer + 50% cowdung and 50% chemical fertilizer + 50% compost in the sub-plots. The experiment was laid out in split-plot design with three replications. Experimental results showed that water regime had significant effect on growth and yield parameters except total weed population, number of effective tillers m-2, filled grains panicle-1, unfilled grains panicle-1, weight of 1000-grains, harvest index, flag leaf length and number of rachis branch panicle-1. The highest grain yield (5.74 t ha-1) was obtained from the waterlogged condition that was statistically similar with saturated condition (5.69) and alternate wet and dry condition gave the lowest grain yield (4.36 t ha-1). Manural status also significantly influenced the growth and yield attributes except total weed population, unfilled grains panicle-1 and 1000-grains weight. The results revealed that the combination of chemical fertilizer, cowdung and compost showed the best performance compared to other manural status. The highest grain yield (5.81 t ha-1) was obtained from chemical fertilizer (50%) + cowdung (25%) + compost (25%) and the lowest grain yield (4.71 t ha-1) was obtained from compost (100%). The highest numberof effective tillers hill-1 (33.71) was obtained from compost (100%). Chemical fertilizer (50%) + cowdung (25%) + compost (25%) showed the highest harvest index (46.78%). In case of interaction effect of water regime and manural status the highest grain yield was observed in chemical fertilizer (50%) + cowdung (25%) + compost (25%) under saturated condition (6.80 t ha-1) of water. The maximum number of effective tillers m-2 (28.80) was obtained from chemical fertilizer (50%) + cowdung (25%) + compost (25%) under waterlogged condition.