我省砂姜黑土主要分布在淮北平原及南阳盆地,总耕地面积1250khm~3.由于砂姜黑土分布区所处的自然条件和该种土壤特殊的物理性状,使农业生产低而不稳.因此,探讨砂姜黑土区作物适宜的灌溉制度,引导农民正确灌水已是当务之急。1 灌水定额1.1 土壤含水量下限.查砂姜黑土水份特征曲线,0.7巴相应的土壤水分为20.3%～22.4%,其值与实测砂姜黑土干缩裂缝时的起始含水量相吻合,故砂姜黑土适宜含水量应定在20%左右. Shajiang black soil in our province are mainly distributed in the Huaibei Plain and Nanyang Basin, with a total area of ​​1250khm ~ 3. Because of the natural conditions and the special physical properties of the soil, the agricultural production is low and unstable. , It is imperative to discuss the proper irrigation system of crop in Shajiang black soil area and guide peasants to irrigate properly. 1 Irrigation quota 1.1 Lower limit of soil water content. The water characteristic curves of black lime soil were investigated. The corresponding soil water content of 0.7 bar was 20.3% -22.4%, which was in good agreement with the initial water content of the measured shrinkage crack of lime concretion. Therefore, suitable for Shajiang black soil water content should be set at about 20%.