西瓜地膜覆盖深坑早播栽培此项新技术利用深坑早播的特点，具有以下优点：（１）深坑与膜之间有一个空间，能起到小拱棚的作用，可提高地温；加之早播７—１０天．使之发苗快．生育良好。（２）幼苗出土后，深坑可起防风作用；又能在早春贮藏少量雨水，对保全苗、壮苗有良... Early planting of watermelon mulching with deep pits This new technique utilizes the characteristics of early plowing of deep pits and has the following advantages: (1) There is a space between the deep pits and the membrane, which can play the role of a small arch and increase the ground temperature; Early broadcast 7-10 days. Make hair fast. Well-born. (2) After the seedling is excavated, the deep pit can play the role of wind-proof; and it can store a small amount of rainwater in early spring, so as to preserve the seedling, strong seedlings and good ...