前苏州地区(包括江阴、沙洲、常熟、无锡、吴县、吴江、昆山、太仓等县)的复种指数较高.一度时期内,随着复种指数的提高,总产逐年上升.但是复种指数超过一定范围,产量已不随复种指数提高而增加,甚至出现投资报酬递减率.这种状况引起有关方面的争议和关注,经过实践,从不同角度提出该区种植双、三制的比例.本文从适宜双抢时 The multiple crop index of the former Suzhou area (including the counties of Jiangyin, Shazhou, Changshu, Wuxi, Wuxian, Wujiang, Kunshan and Taicang) was relatively high. During the period, with the increase of the multiple cropping index, the total output increased year by year. Range and yield have not increased with the increase of the multiple cropping index, and even the rate of return on investment returns .This situation has aroused controversy and concern, after practice, from different angles to propose the area planted double, the ratio of three systems.This article from the appropriate double grab Time