Abstract
This examination was conducted in order to establish the method of low imput non-split fertilizer application in transplanting culture of rice with high level stability. Single spplication oftotal nitrogen with slow release coated-fertilizer at pudding (LPS-plot) was compared with a conventional application method using easily released nitrogen fertilizer, for both basal and top-dressing (Control-plot). The results obtained were as follows; 1) The growth of rice on LPS-plot was relatively inferior to that of Control-plot in tillering stage, but the amount of nitrogen uptake of rice plants on LPS-plot increased rapidly after maximum tiller number stage, with a higher percentage of fruitful culms and numerous spikelets per panicle. As a result, number of spikelets per square meter of LPS-plot was adequate for desirable yield. 2) nitrogen uptake of rice plants in panicle formation stage led to extend the upper internodes and the upper lamina instead of the lower internodes which is highly related to lodging. This seems to be related to raising the percentage of ripened grains by improving the stand geometry of rice plant on LPS-plot at ripening period. 3) The process of nitrogen uptake of rice plants from coated-fertilizer shifted to the later stage in 1993 with a cool summer, and to the earlier stage in 1994 with a hot summer. But it was within the acceptable range for the formation of growing behaviour of rice plants. Therefore it was confirmed that slow release coated-fertilizer is adaptable in various weather years. 4) Efficiency of fertilizing on LPS-plot was improved by the range of 20% to 40% preventing the applicated nitrogen from erosion. 5) Morbidity of the Sheath blight, Thanatephorus cucumeris (Frank) Donk on LPS-plot was lowered. From the foregoing, we conclude that the using of slow release coated-fertilizer with a method of non-split fertilizer application in transplanting culture is effective in establishing the low input and low labor culture.
