First, excessive nitrogen fruit yin and yang face: farmers know that nitrogen fertilizer is a plant life element, in order to pursue high yield and higher yield, then overdosing nitrogen fertilizer, the consequences are: (1) branches are long, the fruit can not normally mature, susceptible to downy mildew Hazardous, early defoliation of plants, poor resistance to shoots. (2) The fruit taste is bad, the color is not uniform, the yin and yang face is formed, the solid content is low, the cooked variety has no storage value, and the loss rate during storage is high.
Second, excessive application of potash fertilizer and unfavorable color: by fertilizer dealers and manufacturers "multiple application of potassium fertilizer coloring" false propaganda and misleading, many farmers over-application of potassium fertilizer, resulting in tree poisoning caused by potassium: from the lower part of the shoot The edges of the leaves were yellowish and the expected natural coloration of fruits was not realized.
In fact, in the process of grape growth, potassium fertilizer has the effect of promoting pulp hypertrophy, but the role of sugar coloring has not been so magical for manufacturers and distributors. Excessive application of potassium not only inhibited the absorption of magnesium, but also inhibited the absorption of phosphorus. In the process of coloring, calcium can promote the transport of sugar produced by the leaves to the fruit and play a role of “glucose increaseâ€. Magnesium and zinc are activators of various enzymes in plants, which play an important role in the transformation of grape pericarp. Since the absorption of zinc by grapes is small and the absorption of magnesium is relatively large, magnesium is the key to the coloration of grapes.
There are mainly three types of potash fertilizer applied to grape fields: potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate. So, what potash is the better potash? Potassium dihydrogen phosphate. Potassium sulfate causes acidification of the soil. Potassium nitrate contains nitrogen which stimulates growth. Potassium dihydrogen phosphate contains potassium, total nutrient content is about 86%, phosphorus promotes flower bud differentiation, potassium promotes sugar synthesis; it is a physiologically neutral fertilizer, does not cause soil acidification, does not affect the absorption of calcium, magnesium and zinc, Therefore, in the period from grape flowering to coloring, potassium dihydrogen phosphate may be used for early coloring for about one week. In the color changing period, potassium dihydrogen phosphate 5-8 kg per acre is applied.
Fourth, ignore the application of phosphate fertilizer color gray bad mouth feeling: In the entire production process, people have ignored the role of phosphorus, phosphorus elements play a role in the connection between the plant, so that various elements in the plant body to accelerate the cycle, in the grape growth and transfer The efficacy of color sugar can not be ignored. Phosphorus deficiency resulted in poor photosynthesis of plants, and the fruits were dark in color, lacking in light, and poor in taste.
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