土壤温度、水分胁迫和播种浓度对玉米种子萌发出苗的影响

Effects of soil temperature,water stress and sowing depth on germination and emergence of maize

摘要: 萌发试验同时在实验室和田间进行。试验结果表明，当土壤含水量低于10%时，玉米种子将不能顺利萌发。温度变化可以加速种子萌发，田间条件下，50%种子萌发所需的积温范围为18.6-23.8℃，决定于昼夜的温差。播种深度影响出苗速率，50%出苗所需的时间播深8厘米比播深5厘米推迟半天（相当于积温3-5℃），80%出苗所需的时间播深8厘米比播深5厘米推迟1天（相当于积温7-10℃）。

Abstract: The germination experiments were carried out both in laboratory and in fields.Results showed that when soil water content was lower than 10%,maize germination would be constrained.Large temperature difference will accelerate germination rate by comparision of the thermal time for Gt50 between laboratory and field results,and among field results of different sowing date.Thermal time reqired for 50% seed germination was at 18.6 to 23.8 ℃ ds depending on the difference in temperature.Sowing depth affected the rate of emergence. When sowing depth was increased from 5cm to 8cm,time repuired for 50% emergence was increased by half a day,and for 80% emergence by one day.