What Fertilizer to Use for Grape Spring Fertilization
The editor answers the question of what fertilizer to use for grape spring fertilization, here is the gardening knowledge introduced by our website editor.
What Fertilizer to Use for Grape Spring Fertilization
For grape trees that grew vigorously in the previous year, if there is no drought in spring, not only should fertilization not be carried out, but also appropriate control of fertilization and watering should be done to prevent excessive growth or luxuriant growth of new shoots, which may affect the differentiation and development of flower buds. The general principle for top-dressing of grape trees in spring is: more for large trees, less for small trees, more for weak trees, less for strong trees, more for trees with many fruits, and less for trees with few fruits.
1. Pay Attention to Garden Conditions and Tree Vigor
1. For grape gardens that did not apply enough base fertilizer in autumn or had insufficient base fertilizer, 50 kg of 15-15-15 nitrogen-phosphorus-potassium compound fertilizer per mu can be applied at this time.
For gardens with high yield and large fruiting in the previous year, more fertilizer should be added according to the tree vigor to promote the quick recovery of nutrient-deficient trees.
2. For grape trees that grew vigorously in the previous year, if there is no drought in spring, not only should fertilization not be carried out, but also appropriate control of fertilization and watering should be done to prevent excessive growth or luxuriant growth of new shoots, which may affect the differentiation and development of flower buds.
However, for trees with average or weak growth, timely top-dressing to supplement nutrients is necessary to promote growth.
In summary, the general principle for top-dressing of grape trees in spring is: more for large trees, less for small trees, more for weak trees, less for strong trees, more for trees with many fruits, and less for trees with few fruits.
2. Pay Attention to Top-Dressing Time
Grapes generally require at least three top-dressings from the germination stage to the fruit expansion stage, such as germination fertilizer, fruit expansion fertilizer, pre-flower fertilizer, color change fertilizer, and post-fruit fertilizer. The specific number of applications and amount of fertilizer should be adjusted according to the garden conditions and tree vigor.
The first top-dressing can be carried out before the germination of grape trees, with nitrogen fertilizer as the main and phosphorus-potassium fertilizer as the auxiliary.
It can also be used according to the method of decomposed manure and urea to meet the nutrient needs of bud differentiation and new shoot growth, with the application amount being 10-15% of the annual fertilizer amount.
Note that trees with sufficient water and fertilizer, strong vigor, and low fruiting may not require germination fertilizer.
The second top-dressing can be carried out from the period after flowering to the beginning of fruit expansion, as the tree has a high demand for nutrients at this time.
Water and fertilizer directly affect the yield of the following year, so heavy top-dressing is required. Top-dressing can be done using decomposed manure, urea, a moderate amount of wood ash or potassium fertilizer, or following the principle of nitrogen as the main and phosphorus-potassium as the auxiliary.
It can also be applied with 0.3-0.5% urea water and 0.3% potassium dihydrogen phosphate spray to meet the nutrient needs for bud differentiation and fruit expansion, with the application amount being 20-30% of the annual fertilizer amount.
The third top-dressing is generally carried out when the grape fruit begins to color, as the fruit expansion, coloring, dry matter, and sugar accumulation also require a large amount of nutrients, but mainly phosphorus and potassium.
Phosphorus and potassium fertilizers, as well as potassium dihydrogen phosphate and wood ash filtrate, can be used for foliar application, with the application amount being about 10% of the annual fertilizer amount.
In addition, during the fruit expansion period of grapes, to ensure high-quality fruit and reduce issues such as fruit cracking, soft fruit, and fruit dropping, attention should be paid to applying an appropriate amount of medium and trace element fertilizers such as calcium, boron, and zinc, as well as humic acid and fruit-protecting nutrients.
It is recommended to apply foliar sprays for top-dressing, as this method has high efficiency and fast absorption.
For pre-flower fertilizer, it can be applied 10-15 days before the flowering of grape trees. Normal trees may not need it, but weak trees need top-dressing to enhance tree vigor.
4. Other Management during Tree Germination
After the trees have germinated, it is necessary to manage the removal of buds from the lower part of the tree, retaining the top two main clusters, and removing the lower buds, auxiliary buds, and dense buds.
For the fruiting branches on the trees, it is necessary to remove the auxiliary shoots at the leaf nodes to promote the growth of the top of the branches. A day or two before the flower clusters bloom, the branches should be topped to promote more and better fruit setting.
The above is[] about what fertilizer to use for grape spring fertilization for reference by green plant enthusiasts, hoping to solve your problems in green plant and flower management.