The growth cycle of walnut is divided into the germination period, the leaf expansion period, the flowering period, the fruit hard nuclear stage and the fruit ripening period. The suitable time for applying fertilizer to walnuts in summer is pre-flowering, fruit swelling and fruit hard nucleus. In general, each plant applies 0.8-1.0 kg of nitrite phosphate fertilizer. At the same time, walnut seedlings can also be supplemented with spray fertilizer. During the period of flowering, new shoot speed, flower bud differentiation and harvest, the commonly used spray fertilizers are 0.1% to 0.2% boric acid, 0.5% to 1%. Ammonium molybdate, 0.3% to 0.4% copper sulfate and the like.
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