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牧草整个生育期积温、降水量多,生长期就延长,相应产草量就高;牧草旺长期的需水关键期,降水量的多少直接影响牧草的株高;气温偏高,蒸发量增大,会加剧草原旱情,若是降水超量时,过多的降水天气可能导致气温下降或气温回升缓慢,热量条件不足而抑制牧草生长发育进程,牧草质量差且产量低,只有热量和水分条件相匹配才有利于牧草生长;牧草随长势对温度要求越来越高,其中抽穗至成熟期日平均气温超过15℃的天数持续15d左右,可获取较高干草产量。
Forage throughout the growing period of accumulated temperature, precipitation, the growth period is extended, the corresponding production of grass is high; Forage Wang long-term water demand critical period, the amount of precipitation directly affects the forage plant height; high temperatures, evaporation increased , Will aggravate the steppe drought, if the excess rainfall, excessive precipitation weather may lead to temperature drop or slow temperature rise, lack of heat to inhibit the process of growth and development of forage grass quality and low yield, only the heat and water conditions match Which is beneficial to the growth of forage grass. The forage grass grows more and more with the growing temperature. The number of days when the average daily temperature from heading to maturity is more than 15 ℃ lasts about 15 days, and higher hay yield can be obtained.