成都平原稻田持续高产高效种植制度的定位研究

本文通过六年定位试验，从生产能力、经济效益及对土壤理化性状的影响几方面进行分析，探讨不同种植制度的产量水平、经济效益和稳产性。综合分析结果看出：成都平原稻田麦稻晚秋，油、稻晚秋轮作方式有利于改善土壤理化性状，提高土壤肥力，实现持续高产高效，是本区较优良的持续高产高效种植制度；在目前一年二熟制为主的情况下，应大力开发利用晚秋资源，提高稻田综合效益；增种一季晚秋作物有利于后茬小麦增产，对减轻小麦连作障碍有显著作用，油菜、小麦连作都会导致土壤理化性状恶化、作物产量降低。

Continuous Study on Sustained High-Yie and High-Efficiency Cropping System for Paddy Soil in Chengdu Plain

Through six-year continuous study, by means of analysis of the effect of different cropping systems on productive ability, economics and tested soil physical and chemical property, we have got to know the yield status,economics and yield stability of different cropping systems.Resterch results show that:(1) Wheat-rice-late-fall harvested crop and rapeseed-rice -late-fall har vested crop cropping systems for paddy soils in Chengdu Plain help im prove soil physical and chemicalproperty, soil fertility as well as help attain sustained high─output and high─efficiency agriculture. (2) Under the main status of two harvests per year, we should devote major efforts to developing and utilizing the resources of late-fall harvests crops for high economics of paddy soils (3) In wheat─rice cropping system,planting a late─fall harvested crop is favourable to increase the yield of succession crop─wheat, and has significant effect on overcoming the obstacles of continuous wheat─rice cropping system.(4)Continuously cropping rapeseed wheat results in soil physical and chemical property worsen, and decreases the yield of rapeseed and wheat.