Over application of nitrogen fertilizer fruit "yin and yang face"
Fruit farmers know that nitrogen fertilizer is the life element of plants. In order to pursue high efficiency and higher yields, they over-dosed nitrogen fertilizer. The consequences are: the branches are long, the fruits cannot be matured normally, and are susceptible to downy mildew. The plants fall early, and the branches have poor cold resistance; the fruit tastes Poor, uneven coloring, forming yin and yang faces, low solid content, late maturing varieties have no storage value, and high loss rate during storage.
Excessive application of potassium fertilizer is not conducive to color enhancement
Due to the false propaganda and misleading of fertilizer distributors and manufacturers "multiple application of potassium fertilizer to increase sugar coloring", many farmers over-applied potassium fertilizer, resulting in potassium poisoning in the tree: starting from the middle and lower branches, oily yellowing at the edge of the leaves, expected The natural coloring of the fruit was not achieved.
In fact, during the growth of grapes, potassium fertilizer has the effect of promoting pulp hypertrophy, but the effect of sugar coloring is not as magical as the manufacturers and distributors. Excessive application of potassium fertilizer not only inhibited the absorption of magnesium, but also inhibited the absorption of phosphorus. In the coloring process, calcium can promote the transportation of sugar produced by the leaves to the fruit grains, which plays a role of "increasing sugar". Magnesium and zinc are activators of various enzymes in plants and have an important effect on the color change of grape peels. Since grapes have little absorption of zinc and relatively large absorption of magnesium, magnesium is the key to grape coloring.
There are three main types of potassium fertilizers used in grape fields: potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate. So, what kind of potash fertilizer is better? Potassium dihydrogen phosphate. Potassium sulfate causes soil acidification, and potassium nitrate contains nitrogen, which stimulates growth. Potassium dihydrogen phosphate contains phosphorus and potassium, and 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, magnesium, The absorption of zinc, therefore, potassium dihydrogen phosphate can be used for early coloring after the grapes are flowered to the color transformation period. It can be colored one week earlier. During the color transformation period, 5-8 kg of potassium dihydrogen phosphate is applied per acre.
Ignoring the application of phosphorus fertilizers
In the entire production process, people have neglected the role of phosphorus. Phosphorus element plays a role in the plant body, which accelerates the circulation of various elements in the plant body. The effect cannot be ignored in the process of grape growth and color change and sugar increase. After phosphorus deficiency, the plant photosynthesis is poor, the fruit is gray in color, without light, and tastes bad.
Measures to promote grape sugar and coloring
1. Reasonable load, increase leaf-to-fruit ratio, leave 8-10 leaves on the ear of the ear, and the single leaf of the axillary accessory shoot is posterior. 2. During the color transformation and expansion period, potassium dihydrogen phosphate, magnesium sulfate, molybdenum fertilizer, and tryptamine are sprayed on the leaves to effectively promote photosynthesis and have an effect that cannot be underestimated for coloring sugar. 3. Control nitrogen fertilizer and prevent hormones from flushing, which is beneficial to human body and mind health.
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