Study on Water Use and Yield Response of Soybean

Field experiment was conducted at the Hsueh-Chia Experiment Station for spring and autumn seasons of 1993~1994 in Taiwan. Five treatments were tested. For both years, the average seed yield of spring crops was higher than autumn ones. Treatment D irrigation was kept at 1/2 available soil moisture in the growing period which got maximum seed yield (3,111.9 kg/ha in spring, 2,434.5 kg/ha in autumn). Treatment D and Treatment E (no irrigation during growing period) had significant differences in their average values. The average increase rate of seed yield for soybean was about 19.0% in spring and 21.7% in autumn. Total water use were 321.9~847.9 mm and 67.3~336.5 mm in spring and autumn crop respectively. Treatment E gave the maximum average total water use efficiency (6.01 kg/ha/mm in spring, 20.01 kg/ha/mm in autumn), but it was influenced by rainfall in the growing season. Treatment A (one time of irrigation during growing period) which got the maximum average irrigation water use efficiency (63.93 kg/ha/mm in spring, 55.76 kg/ha/mm in autumn).

關鍵字

Irrigation treatment ； Water use ； Total water use efficiency ； Irrigation water use efficiency

並列摘要

本文乃利用嘉南農田水利會學甲試驗站民國82至83期間，進行的大豆不同灌槪處理需水量試驗來探討大豆用水量與產量關係。試驗分析結果如下：（1）春作大豆產量較秋作爲高，春、秋作均以保持1／2有效水分處理者產量最高（春作最高平均產量爲3,111.9 kg/ha，秋作最高平均產量爲2,434.5 kg/ha）。（2）大豆生長期間，保持1／2有效水分處理與不灌槪處理間之產量差異，在春作平均可達19.0%，在秋作則有21.7%。（3）春作之總用水量較秋作爲高，春作有321.9～847.9 mm，秋作有67.3～336.5 mm，主要受到春作生長期間雨量較多之故。（4）平均總用水效率以生長期間不灌槪之處理（E處理）爲最高。不過，其大小受到降雨量多寡之影響，在春作爲6.01 kg/ha/mm，秋作則爲20.01 kg/ha/mm。（5）平均灌溉用水效率以生長期間一次灌溉處理爲最高（A處理），在春作爲63.93 kg/ha/mm，而秋作則爲55.76 kg/ha/mm。

並列關鍵字

灌溉處理；用水量；總用水效率；灌溉用水效率

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