頁籤選單縮合
題名 | 甘蔗灌溉之研究(12):臺灣中質地秋植蔗園合理灌溉期距之分析與推薦 |
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作者姓名(中文) | 楊尚仁; 張玉鑽; | 書刊名 | 農業工程學報 |
卷期 | 25:3 1979.09[民68.09] |
頁次 | 頁21-27 |
關鍵詞 | 甘蔗; 臺灣; 蔗園; 灌溉; |
語文 | 中文(Chinese) |
英文摘要 | Experiments were conducted in medium-textured soil during three crop years period to determine the response of autumn planted sugarcane to different irrigation frequencies. The consumptive use of autumn planted cane during the period of January to early June, the most critical period for irrigation in Taiwan, was estimated from an assigned coefficient which expresses the ratio between actual evapotranspiration of the crop (Et) and the evaporation from a Class A Pan (Ep). Five different ratios of Et/Ep, 0.5, 0.75, 1.0, 1.25, and 1.50 were used to control irrigation frequency in this study. Irrigation for each treatment was scheduled from the available soil moisture content in the root zone and the assumed consumptive rate. Striking similar pattern of the relations between the accumulated actual evapotranspiration and the pan evaporation was observed despite the face the growth and the climatic conditions were quite different for two crop years. The relationship between Et and Ep was found to be linear with a slope of approximately 0.75. Actual evapotranspiration rate increased with the evaporative demand of the air in an averaged daily rate of 2-3mm/day. The peak rate which appeared in May was approximately 4.5 mm/day. Cane growth although was closely related to the available water in the root zone, but the difference in final cane yield between treatments was small and was statistically not significant. To use the limited available water resources economically for irrigation, the interval could be scheduled approximately 20 to 40 days in the dry season between January to June in medium-textured soils under Taiwan's climatic condition. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。