Farmers all know that nitrogen fertilizer is a vital element of plants. In order to achieve higher yields and higher yields, nitrogen fertilizers are used in excess doses. The consequences are: branches are long and the fruits do not mature normally, and are vulnerable to downy mildew. The leaves fall early, and the cold resistance of branches is poor; Poor, uneven coloration, the formation of yin and yang face, low solid content, late-maturing varieties have no storage value, high loss rate during storage.
Excessive potassium fertilizer is not conducive to coloration
Due to false publicity and misinformation by fertilizer distributors and manufacturers “adding potassium fertilizer to increase sugar coloring,†many farmers have over-applied potash fertilizer. As a result, potassium poisoning occurs in the tree body: from the middle and lower parts of the shoots, the edges of the leaves become yellowish, as expected. Natural coloring of fruit has not been achieved.
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 phosphorus and potassium. The total nutrient content is about 86%. Phosphorus promotes flower bud differentiation and potassium promotes sugar synthesis. Potassium dihydrogen phosphate is a physiologically neutral fertilizer that does not cause soil acidification and does not affect calcium and magnesium. The absorption of zinc, therefore, after the flowering to the color conversion period, the top dressing is made of potassium dihydrogen phosphate. It can be used for early coloring for about one week. In the color changing period, potassium dihydrogen phosphate (5 to 8 kg) is applied per acre.
Ignore the bad taste of phosphate fertilizer
Throughout the production process, people have ignored the role of phosphorus, phosphorus in the plant plays a role in the up and down, so that a variety of elements in the plant body to accelerate the cycle, in the grape growth and color conversion process can not ignore the effect of sugar. Phosphorus deficiency resulted in poor photosynthesis of the plants, and the fruits had dark shades, no light, and poor taste.
Promote grape sugar coloring measures
1, a reasonable load, increase the ratio of leaves and leaves, leave 8 to 10 leaves above the head, after the leaves of axillary shoots.
2. During the color-expanding period, foliar spraying of potassium dihydrogen phosphate, magnesium sulfate, molybdenum fertilizer, and chromic acid amine can effectively promote photosynthesis, and the effect of sugar-staining on coloration cannot be underestimated.
3, control of nitrogen fertilizer, eliminate hormone red reminder, is conducive to human physical and mental health.
Remind the majority of farmers, in the late growth period of grapes, must pay attention to less nitrogen fertilizer, more phosphorus and potassium fertilizer.
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