“增温说”和“调水说”是指导地膜玉米最佳播期的基本理论。在湿润、半湿润生态类型区和干旱、半干旱生态类型区的水浇地、二阴地 ,应用“增温说”;在半干旱生态类型区的旱作田 ,应用“调水说”。经多年的试验和调查表明 ,在半湿润生态类型区 ,应用“增温说”指导地膜玉米最佳播期增产 6 9.2 % ;在半干旱地区 ,应用“调水说”指导地膜玉米最佳播期增产6 0 .0 % ,而应用“增温说”播期只增产 15 .7% ,比“调水说”播期减产 14 .4 %。 “Say warming” and “water transfer” is the basic theory that guides the best seeding date of maize. In the humid and semi-humid ecotypes, and arid and semi-arid ecotypes, irrigated land should be used in the two overcast areas. In the semi-arid ecotype area, the “water diversion theory” should be applied. After many years of experiments and surveys, it has been shown in the semi-humid ecotype area that the application of “warming temperature” can guide the optimum sowing date of plastic mulching to increase by 62.2%; in the semi-arid area, The yield increase was 60.0%, while the application of “warming” sowing only increased by 15.7% compared with “water diversion” and sowing by 14.4%.