What Fertilizer to Use During the Grape Swelling Period
Core guide to the main text: Knowledge about the use of fertilizers during the grape swelling period and detailed explanations of grape fertilization precautions in the field of green plants and flowers. The editor of this site will introduce the following content.
The beginning of the grape fruit swelling period is after the fruit is set, when the fruit grows to the size of a soybean. The key to the swelling period lies in the coloring and sugar accumulation of the grape fruit. Grapes need potassium, nitrogen, and calcium elements the most during growth. Sufficient water and fertilizer can improve the quality of photosynthesis in grapes, allowing the fruit to swell rapidly, accumulate more sugar, and mature faster. Therefore, fertilization is very important for maintaining the quality and yield of grapes, and fertilizers must be applied correctly. Let's talk about what kind of fertilizer to use during the grape swelling period.
I. What Fertilizer to Apply During the Swelling Period
1. First Swelling Period
After the fruit is set, top-dress with phosphorus-based fertilizer, supplemented with nitrogen and potassium fertilizers, to promote fruit development.
Apply 30 to 40 kilograms of NPK ternary compound fertilizer per mu, mixed with 10 to 30 kilograms of potassium sulfate, applied in two installments, with an interval of 20 to 30 days.
The fertilization method can be furrow filling, flushing, or drip irrigation, depending on the actual conditions of the orchard. For example, furrow filling requires digging a 10 cm deep trench around the tree canopy and then filling it with the mixed fertilizer.
2. Hard Core Period and Second Swelling Period
Grapes require a large amount of potassium during the hard core period, as potassium helps the plant synthesize sugars, promoting better fruit coloring. A solution of potassium dihydrogen phosphate can be sprayed on the leaves. However, be mindful of the amount of potassium fertilizer used, as excessive application can hinder the absorption of calcium.
From the hard core period to the second swelling period, additional iron elements should be added.
3. Coloring Period and Before Harvesting
Calcium should be supplemented from the swelling period to the coloring period, but after the second swelling period, the grape plants are particularly prone to calcium deficiency, and calcium and boron fertilizers should be supplemented regularly in the soil. During the coloring period, calcium fertilizer should be applied to the leaves, such as Woye Calcium 1000 to 2000 times solution, to prevent a decrease in fruit firmness due to calcium deficiency in the later stages of fruit swelling.
20 to 30 days before harvesting, stop watering and fertilizing to make it easier for the fruit to accumulate sugar, which is beneficial for the coloring of the skin in colored varieties.
II. Precautions
1. Adjust According to Local Conditions
During each stage of the grape fruit swelling period, the type of fertilizer used and the fertilization method must be determined based on the actual situation.
2. Low Molecular Weight Organic Carbon Fertilizer
If fruit drying occurs during the fruit swelling period, it may be due to a lack of nutrients in the soil or poor aeration, preventing the roots from absorbing sufficient nutrients and water needed to develop the fruit.
To enhance fruit coloring and sugar accumulation in grapes, it is necessary to improve the plant's ability to absorb water and fertilizer and strengthen the plant's growth. At this time, low molecular weight organic carbon fertilizer can be supplemented to promote fertilizer efficacy, improve soil aggregate structure, and increase soil water storage.
3. Use of Nitrogen Fertilizer
Applying nitrogen fertilizer can promote fruit swelling, and nitrogen fertilizer should be applied after the fruit is set and during the second swelling period. However, applying only nitrogen fertilizer can cause fruit drop and hinder calcium absorption.
The above information about what fertilizer to use during the grape swelling period and the detailed explanation of grape fertilization precautions is provided to help you. Don't forget to visit more often for more flower care experience and knowledge!