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棉花适宜土壤水分下限和干旱指标研究 被引量:61

A Study on Drought Indices and Lower Limit of Suitable Soil Moisture of Cotton
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摘要 通过研究确定了在节水灌溉条件下棉花生育阶段适宜土壤水分下限(为田间最大持水量百分数)苗期为55%、蕾期为60%、花铃期为70%、成熟期为55%。干旱指标以棉花受旱程度分等,当各生育阶段土壤水分比适宜土壤水分下限值低10%~15%时为中等干旱,小于10%时为轻度干旱,大于15%时为重度干旱。 The lower limits of suitable soil moisture in different growing stages of cotton were determined by conducting an experiment under the water saving irrigation, The water use efficiency in seedling, square, flowering boll and boll opening stage were 55%, 60%, 70%and 55% of field capacity, respectively. In addition, The drought indices were classified according to the levels of cotton suffering from drought, namely when the soil water contents were 10% ̄15%, 10% and over 15% less than the suitable soil moisture in each growing stage of cotton, which were separately called as moderate, light and heavy drought.
出处 《棉花学报》 CSCD 北大核心 1999年第1期35-38,共4页 Cotton Science
基金 "九五"国家攻关项目
关键词 棉花 适宜土壤水分 干旱 cotton suitable soil water lower limits of soil moisture drought level drought indices
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