6Greenham,D.W.P.(1955).The Environment of The Fruit Tree-Managing Fruit Soils.Scientific Horticulture,12:25-31.
7Hipps,N.A.,&Samuelson,T.J.(1991).Effects of long‐term herbicide use,irrigation and nitrogen fertiliser on soil fertility in an apple orchard.Journal of the Science of Food and Agriculture,55(3):377-387.
8Haynes,R.J.,&Goh,K.M.(1980).Some effects of orchard soil management on sward composition,levels of available nutrients in the soil,and leaf nutrient content of mature'golden delicious'apple trees.Scientia Horticulturae,13(1):15-25.