Study on application of Yelükang ball fertilizer in fruit production

The field pairing experiments of Yelukang ball fertilizer were conducted in apple,pear,peach and plum trees.Through field survey and laboratory analysis,the efficiency of the ball fertilizer on greenless recovering of fruit tree leaves,on mineral elements and chlorophyll contents in leaves,as well as fruit yield and apple quality were studied.The obtained results show:After applying Yelukang ball fertilizer,the active iron in the chlorotic fruit tree leaves increased by 8.7%~20.2%,the chlorophyll content of apple tree increased by 18%;the chlorotic degree of fruit trees decreased 2~3 scales,the yield per tree increased by 56%~89%.Through applying ball fertilizer,P,K,Zn,Mn and Cu contents in the leaves decreased,the antagonism between iron and these elements became weaker,and apple quality could be improved.Its the good practical correcting technique for iron deficiency chlorosis of fruit trees and very suitable in extension in large scale.