Applying supplemental fertilizer to walnut trees during the rainy season: better to apply less than more
Choose high-quality seedlings for planting. High-quality seedlings refer to robust grafted seedlings with pure varietal characteristics, well-healed graft unions, and no damage or pests and diseases. Choose plots with a soil layer more than 1 m thick, a pH of 7.5-8.0, a soil salt content below 0.25%, and a groundwater level below 2 m for planting. When planting, apply a 600-fold dilution of Xin Gaozhi Mo...
In July-August, walnut trees have basically little demand for fertilizer, and in particular, do not apply nitrogen fertilizer as a top dressing. Some fruit growers think that since it has finally rained, they should hurry to apply some fertilizer, not realizing that this is a mistaken idea. Applying top dressing at this time will cause walnut shells to remain soft rather than hard. For young trees, applying top dressing at this time will cause excessive vegetative growth of branches, affecting fruiting the following year.However, because July-August is the kernel-filling stage of walnuts, if top dressing is truly needed, start in early July and spray a potassium dihydrogen phosphate solution with a sprayer every half month for foliar top dressing.