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春旱对春玉米幼苗长势影响田间试验分3个播种期(温度处理)和4个土壤水分胁迫处理。结果表明,在东北中部玉米主产区,玉米幼苗长势好坏主要取决于水分。玉米幼苗长势(叶龄、生物量和株高)与春季土壤湿度和土壤累积有效水量的关系模式均为二次函数。干旱胁迫降低玉米苗期生叶速度和植株高度,减轻生物量,严重抑制幼苗营养生长。玉米春旱的指标是:W在18%～19%之间,或H在45～54mm之间为轻旱;17%～18%或40～45mm为中旱;17%以下或少于40mm为严重干旱。
Spring drought on the growth of spring maize seedlings Field trials were divided into three sowing (temperature treatment) and four soil water stress treatment. The results show that in the northeastern maize main producing areas, corn seedlings grow well depends on the water quality. The relationship between the growth of maize seedlings (leaf age, biomass and plant height) and spring soil moisture and soil cumulative effective water volume are quadratic functions. Drought stress reduced the leaf growth rate and plant height at seedling stage of maize, reduced the biomass and severely inhibited the vegetative growth of seedlings. Maize spring drought indicators are: W between 18% to 19%, or H between 45 ~ 54mm for the light drought; 17% to 18% or 40 ~ 45mm for the drought; less than 17% or less than 40mm Severe drought.