一、前言 我县是山大、坡陡的大山区。全县粮食生产中,旱粮生产历来占居重要地位,播种面积大(占粮食总播种面积的72～79％),产量占有较大的比重(占粮食总产的52～58％)。 60年代以前,我县旱地生产基本上是一年一熟单种或一年两熟连作或混作。60年代未至70年代初,官地坪公社部分生产队和五道水公社高家坪大队等地开始试种和小面积推广旱地一年两熟或三熟的间作套种,到70华中期发展到官地坪、马合口等20多个公社的缓坡平塔旱地 First, the foreword My county is mountainous, steep mountainous area. In the grain production of the whole county, the dry-land production has always occupied an important position. The sown area is large (accounting for 72-79% of the total sown area for grain) and the output accounts for a large proportion (accounting for 52-58% of the total grain output). Before the 1960s, the production of dry land in our county was basically a single crop or a double cropping in a row a year or even in a row. From the 1960s to the early 1970s, some production teams of Guandiping commune and Gaojiaping brigade of Wudaohui commune began to try out and small-scale promotion of intercropping with double or triple cropping of dry land in the year of one year to mid-70s To the official floor Ping, Ma mouth, more than 20 communes gentle slope flat dry land