Establishing fertilization recommendation index of balsam pear based on the "3414" field experiments in Guangdong.

Nutrient abundance and deficiency and fertilization recommendation index of balsam pear were established in Guangdong.Data analysis were based on the 3414field experiments of trail in Guangdong from 2002 to 2011.Taking plentiful-lack of soil nutrition as an index,soil alkali-hydrolyzable nitrogen(N),Olsen-P and available potassium were classified into five classes corresponding to relative yield of 50%,75%,90%and 95%.Fertilizer recommended rates were simulated by the models of one-factor,liner and platform for 3414field experiments.The results showed that nitrogen fertilizer(N) rates(kg·hm-2) were 300≤y1390,200≤y1300,140≤y1200,120≤y1140,and 0y1120 when soil fertilizer was classified as very low,low,medium,high and the highest[w(N)≤70 mg·kg-1,70 mg·kg-1w(N)≤120 mg·kg-1,120 mg·kg-1w(N)≤165 mg·kg-1,165 mg·kg-1w(N)≤185 mg·kg-1 and w(N)185 mg·kg-1],respectively;phosphorus fertilizer(P2O5) rates(kg·hm-2) were 200≤y2215,120≤y2200,80≤y2120,65≤y280 and 0y265[w(P2O5)≤5 mg·kg-1,5 mg·kg-1w(P2O5)≤35 mg·kg-1,35 mg·kg-1w(P2O5)≤95 mg·kg-1,95 mg·kg-1w(P2O5)≤140 mg·kg-1 and w(P2O5)140 mg·kg-1],while potassium fertilizer(K2O) rates(kg·hm-2)were 275≤y3372,175≤y3275,110≤y3175,90≤y3110 and 0y390 [w(K2O)30 mg·kg-1,30 mg·kg-1w(K2O)≤85 mg·kg-1,85 mg·kg-1w(K2O)≤165 mg·kg-1,165 mg·kg-1w(K2O)≤200 mg·kg-1and w(K2O)200 mg·kg-1].Compared with the fertilization plentiful-lack index by original system,the soil nutrition content of this research suggested that nitrogen,phosphorus and potassium increased.