Reasonable topdressing of fruit trees in summer can promote high yield!

Fruit trees grow fast in summer, and the root system is in need of fertilizer and water protection. During this period, it is easy to lose fertilizer. At this time, reasonable topdressing of fruit trees in summer can promote high yield.

1. Topdressing time and species of fruit trees in summer

In the first and middle of June, topdressing was dominated by phosphorus, expanding young fruits and enriching flower buds, while potassium was the main topdressing from July to August, with obvious yield increase and bright fruit color. It is the best time to topdressing fruit trees in the critical period of nutrients and the period of fruit expansion. This year, the fruit is large and the yield is high. Next year, the flower buds are full and there are many fruits.

Topdressing in the critical period of nutrients is the best time from the first ten days of June to the last ten days. In this period, flower buds began to differentiate and young fruits expanded rapidly. Phosphorus is most needed in this period, which can enrich branches, improve leaf function and increase the output of leaves to produce nutrients. The best time for topdressing during fruit expansion period is from mid-late July to early August. In this period, the fruit trees have the strongest ability to absorb nutrients and the highest fertilizer use efficiency. According to the growth and development characteristics of fruit trees, this period should be based on phosphorus and potassium fertilizer, especially the supplement of potassium elements.

2. Topdressing methods of fruit trees in summer

Topdressing of fruit trees in summer can promote fruit expansion and flower bud differentiation. There are two methods of topdressing: root application and foliar spraying.

Summer topdressing of fruit trees under roots should be based on phosphorus and potassium fertilizers, combined with a small amount of nitrogen fertilizer. The amount of topdressing depends on tree species, tree age, fruit amount and base fertilizer status. The young trees that have not entered the fruiting stage can be applied 0.2-0.25 kg of phosphorus and potassium fertilizers per tree. For general fruiting trees, each tree was topdressing 2.5 kg of calcium superphosphate, 10 kg of plant ash and 2 kg of ammonium sulfate. The method of topdressing is to dig holes in a circle from the vertical downline to the inner 1 meter of the crown, with a distance of 30 cm to 40 cm and a depth of 15 cm to 20 cm. Conditional orchards are fertilized and watered.

Foliar fertilizer spraying during fruit expansion period can enhance tree potential, promote fruit expansion and improve fruit quality. The spraying concentration is 0.2% ammonium sulfate, 0.3% urea, 0.3% potassium sulfate, 0.3% calcium superphosphate and 0.3% potassium dihydrogen phosphate. The effect of foliar spraying on fruit trees in mountainous area is better.

Matters needing attention in topdressing fruit trees in summer

1. First of all, it is necessary to know that the absorption of nutrients by fruit trees mainly depends on the root hairs in the root system. Therefore, spraying fertilizer in the concentrated distribution area of root hair can improve the utilization rate of fertilizer and promote the early growth and rapid development of fruit trees.

2. it should be at the edge of the crown projection or a little far away, not too close to the trunk, because there are thick roots near the trunk, fine roots and root hairs are less, which is not conducive to the absorption of fertilizer.

3. Fertilization should follow the following principles:

Fruit trees with deep ① root distribution should be properly applied deeply, and vice versa.

② organic fertilizer decomposes slowly, but the fertilizer supply period is longer, which can be applied deeply, and the chemical fertilizer has great mobility and can be applied shallowly.

For example, applying organic fertilizer to pear and other deep-rooted fruit trees should be 40-60 cm deep, while applying organic fertilizer to shallow-rooted fruit trees such as plum trees should be 30-40 cm deep. After fertilization, the new high fat film can be sprayed to improve the fertilizer efficiency.

4. For orchards with closed rows or close planting, shallow application can be applied between rows and plants, and it is best not to hurt the big roots or less, so that the fertilizer efficiency can be brought into full play, the utilization rate of fertilizer can be improved, and the purpose of increasing production and income can be achieved.