设计 5种三熟复种新模式 ,即“中早熟水稻 -生菜 -小麦”、“中早熟水稻 -大豆 -小麦”、“中早熟水稻 -玉米/ /甘薯 -小麦”、“中迟稻水稻 -莴笋 /油菜”和“中迟稻水稻 -马铃薯 /油菜” ,以“水稻 -小麦”传统模式作对照 ,于1 996～ 1 998年在广汉市三水镇进行同田大区定位试验。结果表明 :①新种植模式对土地、劳力及光热资源的利用率都比传统模式有了显著提高 ,纯收益以“中早熟水稻 -生菜 -小麦”模式最好 ,其次为“中早熟水稻 -大豆 -小麦”、“中迟熟水稻 -马铃薯 /油菜”和“中迟熟水稻 -莴笋 /油菜” ,而“中早熟水稻 -玉米 / /甘薯 -小麦”模式的经济效益最差。②通过品种选择与茬口调节 ,采取连作和套作两种方式 ,形成的具有较高经济效益和稳定性能的稻田三熟制 ,较好地满足了本区“稳粮调结构、增收奔小康”的客观需求 Five new patterns of three-cropping and multiple cropping were designed, namely “middle-early-maturing rice-lettuce-wheat”, “middle-early maturing rice-soybean-wheat”, “middle-early maturing rice-corn / sweet potato-wheat” / Rape “and” middle-late rice-potato / canola “with the traditional model of” rice-wheat “as the control, and from 1996 to 1998, the experiment of locating the same area was conducted in Sanshui, Guanghan. The results showed that: ①The new planting mode had a significant increase in the utilization rate of land, labor and light and heat resources compared with the traditional model. The net yield of ”middle-early-maturity rice-lettuce-wheat“ model was the best, followed by ”middle- Soybean-wheat “,” late-maturing rice-potato / rape “and” late-maturing rice-lettuce / rape “, while” middle-early maturity rice-corn / sweet potato-wheat “model had the worst economic benefit. (2) Through the selection of varieties and the regulation of crop rotation, the three-cropping system of paddy rice with high economic efficiency and stable performance formed by continuous cropping and intercropping, which satisfied the demand of ”stabilizing grain structure and increasing income well-off" in this area, The objective needs