Greenhouse grape leaves yellow

In general, if you want to answer this question correctly, it can be simple, but it is difficult to put it in clear words. In simple terms, most people will blurt out: This is caused by iron deficiency, and the end of application or spray of ferrous sulfate can be. But specific to the actual situation, it is often not the case. Because the sole application or spraying iron hypertrophy has no obvious effect, and even the phenomenon of red leaves and fallen leaves appears. Where is the reason?

Based on my own practical experience in the promotion of agriculture and forestry technology for more than 30 years, plus the fact that I am in fruit village, I can say that I have also spent a lot of hard work in this area. I have found that the cause of this phenomenon is not only because of iron deficiency alone. However, it is caused by the combination of iron deficiency, potassium, and several other trace elements, as well as root rot caused by unreasonable fertilization habits. The case of Li Changwen and Miao You, a farmer in Matou Village, Shakouji Township, Weixian County, Handan City, has even more cases: Li Changwen started from planting two acres of grapes in 1998 and has 18 years of history. The variety is Kyoho with 330 trees per mu. Since 2001, for more than three consecutive years, there have been more than a dozen yellow leaves, small leaflets, or diseased, thin, or weak trees caused by overload. 1000 g of ferrous sulfate, 500 g of zinc sulfate, 500 g of high-potassium fertilization, 500 g of bio-potassium, 100 g of borax, and 100 mg of calcium nitrate. Mix 15 kg of water and dig small pits under 4-5 trees. 5 -6, pits 5-6 inches deep, the method of pouring fertilizer solution points, every year has achieved a very satisfactory effect of removal, and there has been no recurrence. In the vineyard of neighboring Miaoshichang, which is close to Li Changwen, this yellow leaflet phenomenon also occurred in the spring of 2014. For convenience, 55% (10:10:35) of nitrogen, phosphorus, and potassium were used. "Eurasia America" ​​brand water-soluble fertilizer containing iron, zinc, boron, calcium, sulfur, magnesium, copper, manganese and other elements, 500 grams, and 21% peracetic acid aqueous solution with special effects In milliliters, mixing 15 kilograms of water, and pouring them under the 4-5 trees in the same way as the above-mentioned method, the same obvious effect was achieved. By the end of April of this year, these yellow leaves that were over-moulded were all branches and leaves. It is lush and thriving, and it is no different from normal trees. Their two approaches can provide some helpful help to the fruit farmers who are still plagued by grape yellow leaves.

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