EFFECT OF SILICON ON NITROGEN MANAGEMENT IN AEROBIC RICE
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Date
2009-11-12
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University of Agricultural Sciences, Bangalore
Abstract
Aerobic method is a new concept of growing rice. It is a production system, which
concentrates in direct seeding and intermittent irrigation practices. Compared to lowland rice, requirements for aerobic rice in terms of water and labour were lower to an extent of 50 and 55% respectively. Rice is silicon (Si) accumulator plant and has been demonstrated to be necessary for healthy growth and high stable production. Nitrogen (N) has been and will continue to be the
key input in augmenting India’s food grain production, particularly the rice. For most soils of the country, nitrogen use efficiency (NUE) by rice is very low and is about one-third of applied N. Therefore, a study was conducted to evaluate the effect of Si and N management by adopting leaf colour chart (LCC) under aerobic rice. A field experiment was conducted during kharif-2008 at eastern dry zone soils of Shettigere Bengaluru, (North) in Karnataka. The cultivar used in this investigation was BI-34 and design was split plot with six main plots viz., control (No N), 60 kg N ha-1 (No basal + LCC-3), 90 kg N ha-1 (Urea at 30 kg N ha-1 as basal + LCC-3), 90 kg N ha-1 (DAP at 30 kg N ha-1 as basal + LCC-3) , 90 kg N ha-1 (calcium nitrate at 30 kg N ha-1 as basal + LCC-3) and 100 kg N ha-1 as urea (RDF) and two sub plots viz., with (calcium silicate at 2 t ha-1) and without Si treated plots. The results revealed a significant increase in number of tillers, productive of tillers, number of seeds per panicle, test weight, grain yield and reduction in per cent chaffy grain with the application of calcium silicate at 2 t ha-1 and 90 kg N ha-1 (urea at 30 kg N ha-1 as basal + LCC-3). The highest plant height, straw yield and N uptake were recorded with the application of calcium silicate at 2 t ha-1 and 90 kg N ha-1 (DAP at 30 kg N ha-1 as basal
+ LCC-3). The highest NUE was noticed with the application of Si and 60 kg N ha-1 (No basal + LCC-3). This study suggested the importance of Si and LCC based N application for achieving higher on grain yield, straw yield and NUE in aerobic rice.
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