Author:Little Orange Lamp Crop Technology (xjdzwkj)
Spring and summer are the seasons when citrus is green and lush and grows vigorously. After the spring shoots mature, they enter the peak of root growth, and the fruit also expands rapidly, but many growers react:
The new leaves are thick green and the old leaves are yellow-haired
There are more trees in the middle and lower parts
Yellowed old leaves mostly start yellowing from the petiole and spread along the veins
It eventually spreads throughout the leaf and forms deciduous leaves
Such yellow leaves have a large correlation with root problems. The root problem can have several aspects:
First, the fruit left on the winter tree for too long, so that the nutrients that were originally accumulated in the root system in winter cannot be accumulated;
Second, spring rain leads to orchard water, and neglect of soil management, think that no water on the surface is equal to no water, resulting in soil compaction, now is the first peak of new roots, the root system is not active, young fruits are expanding and need a lot of nutrients and can not get, can only be more transferred from the old leaves;
Third, winter fertilizer is not applied early according to the growth period of citrus, although it was later remedied, but most of the application is a quick-acting fertilizer, and the effectiveness period is not long;
Fourth, if the pursuit of fruit set rate and then circumcision, and circumcision does not pay attention to technology, so that the root system can not get organic matter nutrients to nourish the roots, the root will be very damaged.
The leaves of fruit trees that occur in this situation are yellowed by the main veins of the petiole, and they are also red necrosis.
The pipe tree must first manage the roots. Organic fertilizer before and after autumn shoots is very important, especially at the end of the year, and many people ignore it because of late fruit picking. Organic fertilizer is a long-term fertilizer, the basis for the growth and production of fruit trees, foliar fertilizer and other fertilizers are only supplements, and organic fertilizer can improve the soil and create a good environment for root growth. Measures such as circumcision pay attention to the correct use of circumcision knives, use less compound fertilizer, and dissolve fertilizer with more water.