Effect of Rice Straw Incorpotation on the Soil Fertility and Rice Production

Experiments were conducted from July, 1993 to December, 1995 to study the effect of rice straw incorporation on the rice production and the change of soil fertility. Microbial inoculants, N-fertilizer, and bran were added to the soil to promote the degradation of straw and to reduce the toxic compounds produced during straw disintegration. After five crops of rice, the plant height and tillers at the vegetative tilling and milking stages were higher in the treatment of straw incorporation and N-fertilizer amendment than the others. The nitrogen and zinc contents of leaves in all treatments were lower than average; however, other elements were in normal range suitable for rice growth. Totally, there was no significant difference among the treatments. At harvest, the panicle numbers per hill for control and straw incorporation with microbial inoculant treatments were 11.8 and 14.7 respectively. They were the lowest and highest numbers among these treatments. The grains per panicle in six treatments were 86.3∼90.7. The 1000-grain weight of these treatments was between 25.8 and 26.8 g, and the difference was not significant among the treatments. The grain yield of control was 5.0 tons/ha, the lowest if compared with others. The rice production in the treatments of straw incorporation with N-fertilizer and straw incorporation with bran and microbial inoculant were both 6.1 tons/ha, which was 22% more than control. Rice straw incorporation could increase the organic contents of soil 0.3∼0.6%, and promote the labile element contents in soil, such as P, K, Mg, Ca, Fe, Cu, Zn, if applied with N-fertilizer or amended with bran and microbial inoculants. During the cultivation of 2nd rice in 1995, the soil pH at the depth 0∼60 cm in all treatments was higher at flooding period than at drying period.

並列關鍵字

Straw incorporation

國際替代計量

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