How to Spray Foliar Fertilizer on Walnut Trees for the Best Results
How Should Walnut Trees Be Managed in July and August? Please Give Guidance. The management methods for walnut trees in July and August can refer to the following: 1. Water and Fertilizer Management. For trees that have already set fruit, the fruit size has basically stabilized by July and they enter the shell-hardening stage. During this period, no artificial watering is needed. Excessive soil moisture will cause the shell to become mottled white and the fruit tip to...
How Should Foliar Fertilizer Be Sprayed on Walnut Trees? Please Give Guidance.Foliar spraying of fertilizer is an auxiliary measure to soil fertilization. It involves spraying a fertilizer solution of a certain concentration directly onto the stems and leaves of walnut trees using a sprayer, thereby improving fruit quality and quantity. Foliar spraying of fertilizer takes advantage of the ability of the upper parts of the walnut tree, including stems, leaves and fruit skin, to directly absorb nutrients, and has the advantages of being direct and fast-acting. Generally, 15 to 60 minutes after foliar fertilization, the tree can absorb the fertilizer solution. Especially when encountering natural disasters or sudden nutrient deficiencies, or when supplementing elements that are easily fixed by the soil, foliar fertilization can promptly recover losses. Therefore, foliar fertilization has low cost, is simple to operate, has high fertilizer utilization rate and good results, and is an economical and effective fertilization method. Spraying boron during the flowering period can increase the fruit-setting rate. Spraying ferrous sulfate in May and June can make the leaves thicker and increase photosynthesis. Spraying potassium sulfate in July and August can effectively improve the quality of walnut kernels.
The fertilizer types, concentration and spraying time for foliar fertilization are mainly determined according to soil conditions and the nutritional level of the tree. The commonly used principle is: a lower concentration can be used in the early growth stage of walnut, and a higher concentration can be used in the later stage. In areas with insufficient water and fertilizer, the spraying frequency can be higher. For spraying, fertilizers such as urea, superphosphate, potassium phosphate, copper sulfate, ferrous sulfate and borax can generally be sprayed to supplement major elements such as nitrogen, phosphorus and potassium and other trace elements. Generally, foliar spraying is best done from 8 to 10 in the morning, or after 16:00 in the afternoon, and should not be done in rainy or windy weather. If it rains 15 minutes after spraying, it is best to apply it once more after the weather clears.
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