川中丘陵旱作灰色关联分析

对２１种植模式灰色联分析表明，其综合效益为Ａ类（粮，经，饲，莱结合型）＞Ｃ类（经济作物型）＞Ｄ类（粮经结合型）＞Ｂ类（以粮为主型）。总产值影响因素为投工＞投肥＞经济作物产值＞总投入＞粮食作物产值＞饲料产值＞蔬莱产值。纯收入影响素为经济产值＞投工＞粮作产值＞投肥＞总投入＞饲料产值＞蔬莱产值。

CREY RELATED ANALYSIS OF UPLAND CROPPING SYSTEMS IN HILLY REGIONS OF CENTRAL SICHUAN

Grey related analysis was made of 21 cropping models,which were classified into 4 types,i.e. the composite type of grain crops, cash crops forages and vegetables,(A);grian crop type,(B);cash crop type,(C);and the composite type of grain crops and eash crops,(D);Based on their com-prehensive effects,they were arranged in the order of A C D B.Labour input had the greatest effecton total output,followed in order by fertilizer input,output value of cash crops,total input;outputof grain crops, output of forages and output of vegetables.The above factors appeared in a differentorder based on their influences on net income:output of cash crops labour input output of graincrops fertillzer input total input output of forages output of vegetables.