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通过分析河南省夏玉米播种时期所需的热量条件和水分条件，发现土壤水分是限制夏玉米播种的主要因子，同时探讨了夏玉米适宜播种期的几种预报方法，并提出河南省夏玉米播种时应注意的问题。
Through analyzing the caloric and water conditions during the summer maize sowing period in Henan Province, it was found that soil moisture was the main factor limiting the sowing of summer maize. Several forecasting methods were also discussed, and the planting of summer maize Should pay attention to the problem.