马铃薯地膜覆盖栽培的地积温效应及其生物学意义

THE ACCUMULATED SOIL TEMPERATURE EFFECTS OF COVERING PLASTIC FILM ON POTATO GROWTH AND DEVELOPMENT

两年的田间试验表明，地膜覆盖栽培马铃薯具有显著的早熟增产效应．对不同处理的土壤温度、地下积温和地上积温比较后发现，地下积温是限制马铃薯生长发育的重要生态因素。覆膜栽培可以提早满足马铃薯生育早、中期对地积温的要求，从而达到早熟高产的目的。多熟制条件下，这种效应尤为重要．

The field experiments of several different plastic film coering patterns were conductedfrom 1993 to 1994 on Zhejiang Agricultural University experimental farm.The results showedthat early maturity and high tuber yield can be obtained in the condition of covering plasticfilm cultivation.Comparing the accumulated soil temperature and accumulated air tempera ture of the different treatments,it is found that the accumulated soil temperature is an important ecological factor which limits the growth and development or the potato crop.The de mand of accumulated soil temperature in different potato growth stages, which contributed toearly maturity and high yield,can be obtained in covering plastic film cultivation considerablyearlier than uncovering cultivation condition.In multiple cropping region,the early maturityo f potato crop is very important,which can be obtained in the covering cultivation.