Studies On Characteristics Of N, P, K Nutrition In Apple Orchards With Different Levels Of Yield And Fertilization Technology

In order to get fertilizer application technology favoring high yield and quality fruit while no pollution to environment,Characteristics of N,P,K nutrition in different yield level apple orchards and effect of organic fertilizer and bag controlled release fertilizer on apple growth were studied using'Red Fuji'in field condition as materials, the results showed that:1. Soil alkaline hydrolysis N, available P and K concentration had increasing tendency as yield level increased, that indicated the important effect of soil fertility on yield. But the three index value changed much and had low correlation coefficient with yield at the same yield level.At high yield level orchard Leaf total N and P , fruit total N were relatively high but leaf total K and Fruit total P were relatively low, leaf total K was mostly influenced by yield, and decreased with yield increased.The effect of fertilizing on yield was changed with yield level change ,P application did not increase yield at all four yield level orchards, but as K was concerned,it was contrary,N application increased yield at middle and low yield level orchard.2. Basing on fertilizing inorganic fertilizer , burying crop straws , fertilizering compost and cake fertilizer can improve sucking root and total root , form the fact of root distributing , burying crop straws extendes the root depth, the rate being seen of sucking root distributing in 41cm–80cm soil is 45.4%; From seeing the trees top growth status, the measure of mixing compost , cake fertilizer and burying crop straws can apparent increase short branch and total branch per unit of area , increase leaf area cofficient , tree's growth and fruit fertility and can apparent improve fruit yield and quality . Because the yield is stabilization , it can evoid the phenomeno of'big and small year'3. Compared to the same amount of disperse application fertilizer being bag-controlled released treatment makes available nutrients stable;When fertilizering 11kg N per 666.7 m2, the rate of utilization of nitrogen is 2.7 times as compared to the same amount of disperse application in one time and 1.6 times as compared to compound fertilizer spreading application in four times; Nutrients stable accommodating can make the apple tree grow...