Grapes become soft after ripening

Every time the grapes begin to change color, some of the fruit grains begin to soften, not full enough, and the color looks black and not fresh. The yield and quality of the grapes are greatly affected. What is going on here?

According to expert analysis, the original problem lies in the use of fertilizer.

Grapes are fertilizer-loving crops. During the growth process, they require large amounts of elements such as nitrogen, phosphorus, and potassium, as well as medium and trace elements such as calcium, boron, magnesium, and zinc. During the entire growth period of grapes, although the demand for nitrogen and potassium is relatively large, long-term excessive application will produce antagonistic effects among the elements. In particular, excessive potassium will inhibit the absorption of calcium.

In addition, the demand for boron and calcium during the flowering period of grapes increases. In addition to promoting the germination and growth of grape pollen tubes, promoting pollination and fertilization, increasing fruit setting, reducing seedless fruits and increasing yield, boron fertilizer can also increase sugar content. Quantity, improve the quality of the fruit. Calcium can improve fruit toughness, prolong the hanging time, reduce fruit cracking, and improve storage and transportation. Calcium is a key element for sugar accumulation and improves fruit sweetness. It can be seen that calcium is an indispensable nutrient in the growth and development of grapes, especially in the period of grape expansion to color conversion. If the calcium supply is insufficient, the grapes will grow weakly, the fruit will become soft and easily rotten, and the storage resistance will be poor.

In this regard, it is recommended to pay attention to the following points when using fertilizer:

Appropriately reduce the amount of nitrogen and potassium. In order to avoid soil salinization, use low-nitrogen and low-potassium or medium-nitrogen and low-potassium fertilizers when topdressing, about 10 kg per mu. In addition to meeting the nutrient requirements of grapes, it can also be used gradually The content of nitrogen and potassium in the soil is restored to the appropriate range, and then fertilization is performed according to the normal amount.

Increase the application of organic fertilizer. Taking advantage of the opportunity of applying base fertilizer in autumn, increase the amount of organic fertilizer, especially commercial organic fertilizer with high organic matter content. Applying 15 bags per mu can not only promote the formation of soil aggregate structure, make the soil loose and breathable, which is conducive to the growth of trees, but also reduces the fixation of chemical nutrients in the soil and improves fertilizer utilization.

Supplement the trace elements. When applying organic fertilizer in autumn, use 0.5 kg of boron fertilizer and 80-100 kg of calcium fertilizer per mu. After the grapes have set fruit, add 2 kg of calcium fertilizer in time; during the growth period, the boron fertilizer is mainly sprayed twice in a row before the grapes bloom and during the blooming period; the calcium fertilizer spraying is generally carried out in multiple times: the first time is 1 week after the flower fades. During the nucleation period, use it continuously for 2 to 3 times with an interval of 7 to 10 days; spray it again 10 to 15 days before grape harvesting. Calcium fertilizers such as chelated calcium or lignin calcium with high absorption and utilization rate can be selected.

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