土壤贮水与旱地作物产量关系的模拟研究

采用人工控制土壤贮水量,研究作物产量与土壤贮水量关系的结果表明:对土壤深层贮水的利用能力油菜最强,小麦、豌豆次之,谷子最差;获得一定籽粒产量的最低土壤水分临界值约为:小麦160mm,豌豆150mm,谷子和油菜300mm;土壤水分超过临界值后,增加水分作物产量大幅度提高;但当水分增加到一定量,豌豆约300mm、小麦400mm、谷子500mm、油菜650mm时,产量则渐趋于稳定;土壤水分生产效率每毫米水最高生产小麦1.18kg,谷子0.78kg,豌豆0.69kg,油菜0.69kg。

IMITATIVE RESEARCHES ON THE RELATIONSHIP BETWEEN SOIL MOISTURE STORAGE AND CROP YIELD IN DRYLAND

The relationship between crop yield and storage of soil moiture is studied by artificial moisture control. The result showed that the utilizable ability of rape is the mgt powful to deep layer soil moisture,next to wheat and pea,millet is the lowest. The critical value of soil moisture storage obtained a certain autput of wheat is about 160 mm, pea 150 mm, millet and rape 300 mm. Crop yield can be improved with an increase of storage of soil moisture under the condition of storage of soil moisture is over the critical value. But then soil moisture increasing to a certain amount, crop yield teeds to stabitity. for exmaple, pea 300 mm,wheat 400 mm,millet 500 mm,rape 650 mm. The water productive efficiency of the highest in wheat is 1.18 kg/mm·mu, millet 0.78 kg/mm·mu, pea 0.69 kg/mm·mu;rape 0.69 kg/mm·mu.