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The responses and optimum application rate of N,P,K fertilization for Liuyuehong dasheen in Yongding County were studied by field experiments.The results of 10 tests showed that the soil conditions contributed only 58.7% on the dasheen yield.Application of N,P,K increased the yield by 23.7%,14.9% and 14.6%,respectively,on the average,at a statistically significant level.The output/input ratios on N,P and K were 10.9,11.2 and 6.3,respectively.It showed that the fertilization positively affected the yield and income.The optimum application rates were found to be N 167 kghm-2,P2O5 74 kghm-2 and K2O 179 kghm-2 for Liuyuehong dasheen,or at 1:0.44:1.07 in proportion.However,the rate differed on soil of different fertility grades,relating to the content of available nutrients in the soil.
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