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頁籤選單縮合
題名 | 大豆殺草劑施用方法對於藥效與產量之影響 |
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作者姓名(中文) | 王啟柱; | 書刊名 | 中華農學會報 |
卷期 | 90 1975.06[民64.06] |
頁次 | 頁11-26 |
關鍵詞 | 大豆; 施用方法; 殺草劑; 產量; 藥效; |
語文 | 中文(Chinese) |
英文摘要 | The shift of weed species after herbicide application reduces the effect of weed control from crop to crop and from year to year. It is because the susceptible weeds were greatly deminished, and thus some resistant ones became dominant. For this reason, some experiments of chemical weed control were conducted in soybean in the past three years, not only for the purpose of the evaluating the effectiveness of herbicides, but also for the methods of application, particularly, the additional weeding practices preemergence spray, in order to overcome the serious competition of weeds over the crop. The percentages of weed control two months after herbicide application in the third year experiment, of prometryne, Lasso (alachlor) and Lorox (linuron) were rated as 63.5, 59.0 and 56.7% respectively, Ramrod (propachlor) was not so effective, rated only 36.8%, and that Sirmate (rowmate), seasone and Tok E-25 (nitrofen) were not enough persistent for longer weed control. During the three-year experiments, Lasso, Lorox and prometryne were evaluated for the weed control in soybean. The application of Lasso and Lorox resulted in higher bean yield than did prometryne. However, the latter showed high potential of weed control. Owing to the different distribution of rainfall throughout a year, an interaction between the application rate and crop-season was shown markedly from the differences of herbicidal injury and bean yeild. Prometryne and Lorox gave a sligntly injury in the fall-crop when the weather was occasionally dry, and it would never happen during the wet season for the spring-crop. It seems that prometryne is not so good for soybean weed control as it dose for peanut. Therefore, it might be better to reduce its dosage (less than 3 kg/ha or 1.5 kg ai/ha), in order to avoid the likely sacrifice of bean yield. Additional weeding is quite neccessary for maintaining the normal growth and yield of soybean in continuous cropping with repeated application of the same herbicides. In the first experiment, however, the application of calcium cyanamide for basal fertilizer before the preemergence spray of herbicides did not have any significant effect on better weed control. In the second experiment, two months after the preemergence spray, pull-off long weeds emerged out above the crop only, could increase the yield by 28.1%; instead, an additional cultivation increased 35.1%. In the third experiment, basides the ordinary preemergence application of herbicides, using Treflan (trifluralin) for the additional soil incorporation at the time of land preparation increased 85.1% of yield, as compared with the non-additional treatment. But one additional cultivation at two months after planting increased even more, 100.1%. |
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