頁籤選單縮合
題名 | 水稻石灰施用法之研究=A Study on the Method of Lime Application to Lowland Rice |
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作者 | 張守敬; 林韞珠; 步焱昇; Chang, S. C.; Lin, U. C.; Phu, Y. S.; |
期刊 | 中華農學會報 |
出版日期 | 19600900 |
卷期 | 31 民49.09 |
頁次 | 頁1-12 |
語文 | chi |
關鍵詞 | 水稻; 石灰施用法; |
英文摘要 | Experiments on lime requirement for paddy rice were carried out at five localities representing three kinds of the most important acid soils in Taiwan in a period of two or three years. The three acid soils are Latosol, Yellow earth and the acid sandstone and shale alluvial soil. The pH values are all bellow 5.5. In the experiments, rate of lime, method of continuous and intermittant application, and basic and top application are included for comparing their relative effect on the yield of paddy rice. The pH values of the soils at three localities after harvesting of each crop in course of two or three years were determined so as to interpret the crop response to lime in terms of soil pH. The result may be summerized as follows: 1. Yield or rice grain responds to lime more significantly in the first crop than the second crop. In the first crop an increase of more than 20% is frequently obtained, but in the second crop there is only an increase of about 10%. 2. The lime applied one or half year ago may show its residual effect on the succeeding crop. The effect is also larger for the first crop than for the second crop. 3. Comparing continuous application of lime to both first and second crops with application of lime to first crop only, the response of rice to lime is in general comparable in first crop. In the second crop, the non-liming plot is no wores or even better than the liming plot. This tendency is more pronounced in the second and third year. 4. At the first year, the response of rice grain to lime increases with the rate of lime applied, but this difference is no more significant in the later years. 5. Continuous application of lime at a rate of 3 MT/ha for four continuous crops will bring the pH of soil to 7.2-7.5. Further application will no more raise the pH. It seems that loss and gain of lime in soil under such condition are equilibriated. 6. Leaching of lime in flooding soil seems very quick. Suspending to lime for one crop will materially cause a drop of pH after liming for one or several crops. However, intermittant application of lime may still bring up the pH of soils gradually in course of years, presumably to 7.2-7.5 evertually, as years pass on. 7. Liming the soil when its pH is already above 6.5 seems detrimental to the rice for second crop, but not so for the first crop. 8. with proper rate of lime, top dressing indicates a better result in a number of experiments. 9. For effective use of lime to acid paddy soils, the following points are recommended: (1) For the Latosol, Yellow earth and acid sandstone and shale alluvial soil with pH below 5.5, a rate of 2-3 MT/ha of lime (CaO) is recommended. (2) Lime should intermittantly applied to first crop, but not to second crop. (3) When the pH of soil has raised above 6.5, application of lime should be suspended for one or more crops. |
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