Walnut tree is bigger, the planting density is low, such as alfalfa, ryegrass, dwarf crops, grass to care, to promote the production of fertilizer.
核桃树体较大，定植密度较低，如紫花苜蓿、黑麦草、矮秆农作物等，以草养地，以肥促产。
The activity of soil microorganism is inhibited at low dose. At high dose, the crop yield is decreased by 10%, and on acid soil, by 50%. Alfalfa and tree are also yield decreased.
低剂量时，即可使土壤微生物活性受到抑制， 高剂量时可使农作物减产1 0 % ，在酸性土壤上减产达50 %以上，对苜蓿及树木也同样引起减产。
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