Fruit tree refers to a tree with edible fruits, a general term for perennial plants and their rootstocks that can provide edible fruits and seeds. For example, apple trees, pear trees, citrus trees, apricot trees, peach trees and so on. When fruit trees lack nutrients, the morphology of the trees can be clearly displayed, so how to diagnose the lack of boron fertilizer? Today, I will introduce the phenomenon of lack of boron fertilizer in fruit trees and the technology of applying boron fertilizer.

The phenomenon of lack of boron fertilizer in fruit trees

The general requirement of fruit trees for soil available boron is about 0.5-0.8 μg/ml. Boron deficiency in fruit trees first occurs and manifests in the growth point and new leaves. When grapes are deficient in boron, the leaves have pale yellow spots, poor growth of new shoots, thick internodes on the stems, poor berry development, different ear sizes, reddish-brown corollas often do not fall off, and there are more unfertilized seedless small in the fruit bunch The fruit particles form large and small fruits with stuffing, and the phenomenon of "grand and grandchildren under one roof" appears.

Boron deficiency can lead to stunted pear fruit development, deformity, uneven fruit surface, water-stained necrotic areas on the peel, and later hardening and brown, cracks and shrinkage of the peel, and scattered corks or stone cells in the pulp. fester. Boron deficiency in peach trees will cause brown cork areas near the nucleus of the fruit, which often split along the sutures.

The lack of boron in fruit trees will cause some of the above-mentioned phenomena. If such a situation is discovered, it is necessary to replenish fertilizer in time.

Application technology of boron fertilizer

1. Base application: 200-250 grams of boron per mu or 500-1000 grams of borax, or 5-10 grams of boron or 20-40 grams of borax per tree (quantified according to the size of the crown), or combined Apply compound fertilizer and organic fertilizer together. The application time is generally after the fruit is picked. Dig a ditch with a width of 25 cm and a depth of 20 cm along the drip line of the crown of the fruit tree. Slimboron can also be applied in the same way before new leaves germinate the following year after fruit harvesting.

2. Foliar spraying: Foliar spraying with Suleboron can quickly absorb the crops, have good effects, and is very convenient to apply. It is an important boron application method. During the period when the new leaves of fruit trees are in full bloom (special reminder: for fruit trees that bloom and then form leaves, such as pears and peaches, spray after the new leaves grow to avoid fertilizer damage to flowers, young leaves and buds), early flowering and fruit setting It is appropriate to spray 2-3 times throughout the growing season. The concentration of Suleboron is 0.1-0.2%, and the dosage should be evenly sprayed and the leaf surface is moist. If it rains within 4 hours after spraying, it should be sprayed again. Suleboron can be mixed with pesticides and other foliar fertilizers, which is more convenient and time-saving.