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。

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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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