Preliminary studies on the effects of addition of organic waste materials on nitrogen nutrition and pH of paddy soils [Rangsit and Roiet soils in Thailand]
1984
Chongrak Chancharoensuk | Suphamat Phanitsakpatthana | Sorasit Watcharothayan (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Preliminary studies on the effects of organic waste materials (OWM): rice straw compost (RSC), activated sludge (AS), whisky sludge (SW), filter cake (FC) and caster meal, (CM) on N nutrition of rice and pH of paddy soils (Rangsit and Roiet soils) were conducted in the laboratory. The addition of OWM increased the amount of NH+-4 - N, mineralizable N and pH of Rangsit and Roiet paddy soils. The effectiveness of OWM for releasing NH+-4 -N in paddy soils were ranked as follows: CMASSWFC,RSC. The amount of N released from OWM was partly controlled by their C/N ratio. The relation was in the way that the increasing order of their released N corresponded to the decreasing order of their C/N. The amount of released N could not be predicted solely on the basis of C/N ratio. It was noticeable that pH of the soils amended with filter cake was found to be the highest. The addition of OWM, expected that of filter cake, increased mineralizable N-content in Roiet soil in the higher amount than in Rangsit soil
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