Improving the productivity of scraped soil for wetland rice production [Philippines].
1985
Jearbunyok T.
Organic fertilizer, regardless of source, prove to be effective in improving the productivity of scraped soil for wetland rice production. The effectiveness of the different organic fertilizers used were in the order of 9 t chicken manure > 15 t fresh azolla > 15 t rice straw. The increase in grain yield due to the addition of these organic fertilizers were 60.36, 43.02, and 16.04 percent per hectare, respectively, over the control. The application of either 9 t chicken manure or 15 t fresh azolla per hectare produced grain yield comparable with the application of 40 kg of inorganic fertilizer in the form of urea. The application of organic fertilizer, regardless of source proved not sufficient to supply the N requirement of the crop. The yield and yield components of the crop further increased with the application of 40 kg N in combination with any of the organic fertilizers and with the application of higher levels of N. N application was positively correlated with the number of productive tillers, number of grains per panicle and the grain yield but negatively correlated with percent ripened grains. Based on regression analysis, a grain yield of 4.47 t/ha would be obtained in the soil without N fertilization, however, the grain yield would be increased by 0.04 t/ha for every kg added to the soil. Results of the experiment also showed that P and K application could be omitted in this soil.
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