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大豆、花生、红薯、玉米是低丘红壤区主要的夏季旱地作物,研究表明:四种不同作物在相同或相似的环境条件下,作物水势时空分布的趋势一致;大豆(初花期)、玉米(大喇叭口期)、花生(开花结荚期)、红薯(块根膨大期)永久萎蔫时叶水势依次为:-2.3MPa、-2.10MPa、-1.75MPa、-1.30MPa,土壤水势分别为-1.159MPa、-0.818MPa、-1.534MPa、-1.644MPa。正常情况下,作物叶片水势大小及作物耐旱性顺序为:红薯>花生>大豆、玉米。小麦茬口玉米(抽穗期)和大豆(初花期)因叶片水势连续一周分别低于-2.2MPa和-2.3MPa被旱死。
Soybean, peanut, sweet potato and corn are the main summer dry-land crops in the hilly red soil region. The results show that the trend of spatio-temporal distribution of crop water potential is the same under the same or similar environmental conditions for four different crops; The results showed that the leaf water potentials of peanut (flowering podding stage) and permanent wilting of sweet potato (bulking stage) were -2.3MPa, -2.10MPa, -1.75MPa, -1.30MPa, and the soil water potential were -1.159 MPa, -0.818 MPa, -1.534 MPa, -1.644 MPa. Under normal circumstances, crop water potential and crop drought resistance order: sweet potato> peanut> soybean, corn. Wheat stubble corn (heading) and soybean (early flowering) were drier than the -2.2MPa and -2.3MPa for a week due to the leaf water potential.