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《Acta Agriculturae Universitatis Jiangxiensis》 2017-01
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An Analysis of Cassava Yield Gap and Its Limiting Factorsin in the Main Producing Areas of Guangdong Province

LIANG Hai-bo;HUANG Jie;YU Chang-di;WEI Yun-xia;HE Shi-yu;ZHENG Yong-qing;CHEN Dong-dong;AN Fei-fei;XIAO Xin-hui;College of Resource and Environmental Science,China Agricultural University;Tropical Crops Genetic Resources Institute,CATAS/Key Laboratory of Conservation and Utilization of Cassava Genetic Resources,Ministry of Agriculture;Guangdong Biological Energy Co.,Ltd.;Guangzhou Experimental Station,CATAS;College of Resource and Environmental Science,Hebei Agricultural University;  
In order to analyze the limiting factors in the the cassava yield gap in the main producing areas of Guangdong Province,and search for ways to reduce the yield gap,the cultivation management of farmers were investigated in this study,also the levels of yield gap and its limiting factors were analyzed from the aspects of group construction,nutrient management and production and investment structure. The results showed that cassava yields were significantly different among different yield levels,and the yield gap YGTbased on the high-yield farmer's yield,the yield gap YGBin the high yield record,and the modeled yield gap YGMwere 14.32,39.05,and 42.86 t / hm~2,respectively.In the group construction of cassava,the average planting density and continuous cropping years of 25% of the lowest yield farmers were significantly higher than those of other farmers.In terms of nutrient management,the proportion of N in fertilizer was too high,P_2O_5 and K_2O amount were insufficient in 25% of the lowest yield and 25% of the medium yield farmers,in particular,the amount of K_2O and its ratio were extremely low. N,P_2O_5 and K_2O amount for basic fertilization were far lower than those of other farmers,N amount was higher and K_2O amount were lower for top-dressing fertilization.Under the current management level,the contribution rates of N,P_2O_5,K_2O to the yield gap were 23.1%,22.2% and 34.4%,respectively,only 6.02% ~ 10.11%of the farmers reached a high yield and high efficiency. In the composition of production and investment structure,the ratio of yield to investment was at the maximum when the yield reached 72.71 t / hm~2,after that,it showed a diminishing tendency with the increasing of yield.The cost of labor,especially that spent on the harvest,was the main limiting factor in yield.Based on these findings,it is proposed that reasonable density,reduction of continuous cropping years,increase in nitrogen,phosphate and potassium fertilizer for basic fertilization,reduction in nitrogen fertilizer and increase in potassium fertilizer for top-dressing fertilization,promotion of full mechanization are important ways to reduce the yield gap of cassava.
【Fund】: 国家现代木薯产业技术体系资金资助项目(CARS-12-hnhj、CARS-12-gdqxd)~~
【CateGory Index】: S533
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