Recommended N,P and K Fertilization for Single-cropping Rice in Fujian

Based on the recent 289 field experiments on N,P and K fertilization forthe single-cropping ricein Fujian,recommendations were formulated using the response function methodology.The results showed that(a)on average the rice yieldswith the N,P and K applications increased by 22.6%,15.5% and 15.6% respectively;(b)fertilizationon the medium-to low-yield fields was more effective than the high-yield fields;(c)P applied in the mountainous areas produced greater result than the coastal zones;(d)K showed an outcome opposite to that of P;(d)in general,the economical application rates were N 160kg·hm-2,P2O559kg·hm-2,and K2 O 122kg·hm-2,with a proportion of N∶P∶K=1∶0.4∶0.8;and(e)fertilizer application rate varied bylocation and soil fertility of the rice field.Regression equations between the alkali-hydrolyzable N,Olsen-P or available K of the soil in question and theappropriateN,P and K fertilizations are presented to provide aneasy access for the field applications once the soil conditionsare determined.