地膜覆盖对谷子产量影响的整合分析OACSTPCD

In order to explore the main influencing factors and influence degree of millet yield effect under plastic film mulching conditions,integrated analysis was used to compare and analyze the effects of plastic film types,field management measures and natural conditions on the yield-increasing effect of millet.The results showed that the average yield increase rate of millet under film mulching was 35.5%(95%CI 26.5%～34.2%)compared with that without film mulching.The increase of millet yield by different film types was in the order of water-permeable plastic film(65.30%)＞polyethylene plastic film(white:36.62%;black:23.62%)＞degradable film(18.24%).In terms of natural conditions,plastic film mulching had the most significant increase on millet yield in Northwest China,reaching 61.20%,followed by Southwest China and North China,which increased by 23.43%and 17.87%,respectively,while East China had the smallest increase of 10.97%.The yield increase rate of millet after film mulching was higher during 1997～2004 and 2017～2022,which were 51.81%and 42.48%,respectively.When the annual precipitation is less than 500 mm or the annual average temperature is 8～12℃,the effect of plastic film mulching on millet yield is the best.In terms of field management measures,when the amount of nitrogen application is≤85 kg/hm2,the amount of phosphorus application is＜90 kg/hm2 or the amount of potassium application≤45 kg/hm2,the effect on the yield of millet after film mulching is more significant.The yield increase rate of foxtail millet with planting density＜300000 seedlings/hm2 was 16.47 percentage points higher than that with planting density≥300000 seedlings/hm2.The yield increase rate of millet planting on black loessial soil field was the highest.Therefore,in order to improve the yield-increasing effect of millet film mulching,it is necessary to comprehensively consider the selection of film type,the rational allocation of field management measures and the local natural conditions.