一、前言人们在长期农业生产实践中,总结出在同一块土地上轮换种植各种作物的经验,即轮作。合理轮作就是作物的轮换种植次序和年限使整个轮作周期获得均衡而稳定的增产,同时达到培肥地力的目的。然而,至今还未见到对作物茬口反应作一量的评价和判断。而只能对茬口作以比较如“好茬”、“坏茬”、“红茬”、“白茬”、“甜茬”、“苦茬”、“油茬”、“草茬”、“肥茬”、“瘦茬”等不具体的概念来形容。为了使茬口反应也引上量的范畴,建立具体的茬口指数数量,来比较衡量各作物间的茬 I. INTRODUCTION In the long-term practice of agricultural production, people summed up the experience of rotating and planting various crops on the same land, that is, rotation. Reasonable rotation is crop rotation sequence and planting rotation so that the entire rotation cycle to achieve a balanced and stable increase, while achieving the purpose of fertility. However, so far, there has been no evaluation and judgment on crop response. But only to stubble for comparison such as “good”, “bad”, “red stubble”, “stubble”, “stubble”, “stubble”, “stubble”, “stubble” Fat stubble “,” stubble "and other non-specific concepts to describe. In order to make stubble reaction also lead to the amount of category, the establishment of a specific stubble index number, to compare the stubble between the crops