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研究了淹水、田间持水量、６０％田间持水量３种水分条件下水稻生长发育状况、蒸散量和产量。结果表明土壤水分含量与水稻产量呈极显著或显著正相关；水稻蒸散量在淹水条件下为６０５毫米，６０％～８０％田间持水量条件下为３４７毫米，孕穗期和灌浆期日蒸散量大。土壤含水量在田间持水量以下时，土壤中无机氮以硝态氮为主，而水稻体内缺乏硝酸还原酶，这是造成水稻氮素营养障碍的重要原因。脯氨酸可作为水稻受水分胁迫的指标
The growth and development status, evapotranspiration and yield of rice under flooding, field water holding and field water holding capacity of 60% were studied. The results showed that there was a significant or significant positive correlation between soil water content and rice yield. The evapotranspiration of rice was 605 mm under flooding condition and 347 mm under 60% -80% field capacity. The evapotranspiration at booting and filling stage was large . When the soil water content was below the field capacity, nitrate nitrogen was the main inorganic nitrogen in the soil and nitrate reductase was absent in the rice, which was the main reason for the nitrogen nutrition disorder in rice. Proline can be used as an indicator of water stress in rice