Effect of successive application of organic matter to paddy rice in gley paddy soil. I. Effect of successive application of rice straw and rice straw compost on growth and yield of paddy rice

Anzai, T.; Kaneko, F.; Matsumoto, N.

Bulletin of the Chiba Prefectural Agricultural Experiment Station 30: 71-80

1989


Accession: 002087058

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Abstract
The effect of successive applications of rice straw and rice straw compost on the growth and yield of paddy rice was examined in paddy fields at Sawara and Karitago with low and high soil N levels, resp. At Sawara, ploughing-in rice straw in autumn was the most effective treatment over the 5-year experiment but it did not become very effective in improving growth and yield of paddy rice until the 4th year. When rice straw was ploughed-in in spring, paddy yield was almost equal to that obtained when chemical fertilizer was applied from the 3rd year on. At Karitago, the growth of rice in the soil supplemented with rice straw compost was retarded initially and restored after the panicle formation stage. The yield was lower than that in the soil supplied with chemical fertilizer due to a decrease in the percentage of ripened grains. Successive applications of 30 t compost/ha produced more stems and grains/msuperscript 2 but a lower percentage of ripened grains and yield than where chemical fertilizer was applied, from the 4th year on. The growth and yield of paddy rice in the soil to which rice straw ash was applied were almost equal to those obtained with chemical fertilizer.