Water management

Seasonal characteristics. May to June generally have high temperature and little rain, and this period coincides with the stage of rapid growth and flowering of walnut trees and fruit development, which requires a lot of water and should be supplemented by irrigation. The period and frequency of irrigation depends on the climate, soil moisture content, and walnut tree growth. The method of irrigation should also be based on local water source conditions and equipment conditions, such as irrigation, sprinkler irrigation, drip irrigation, etc.

Irrigation time. Irrigating 1-3 times during summer drought is very important for walnut growth and development. After the walnuts bloom and before the flower buds differentiate, that is around June, after the female flowers are fertilized, the fruit enters the rapid long-term, and the growth amount accounts for about 80% of the annual growth. By the end of June, the female flower buds have begun to differentiate. During this period, a large amount of nutrients and water supply are needed. It should be irrigated once to ensure that the kernels are full. In June, the walnut hard core period requires a lot of water supply. Generally, it is required to irrigate 1-2 times a month in the summer dry season. Young trees are irrigated more, and fruit trees are less irrigated.

Pay attention to drainage. In areas prone to water accumulation and excessively high groundwater levels, attention should be paid to drainage work, mainly by digging drainage ditches for drainage, and mechanical drainage can also be used for temporary local water accumulation. To lower the water level, dig a 1.5-meter-deep drainage ditch or during land preparation Reduce the water level by building Taitian.

Young Fruit Management

Early walnut. Early-fruiting walnuts are dominated by lateral flower buds and have a large amount of female flowers. After the fruit-bearing period, in order to ensure the relative balance of vegetative and reproductive growth of the tree and maintain high and stable yields, excessive young fruits must be removed. The fruit thinning time is after the physiological fruit drop, generally 20 to 30 days after fertilization of the female flower, that is, when the young fruit is 1 to 1.5 cm, the fruit thinning is appropriate. The amount of fruit thinning should be determined according to the tree vigor and cultivation conditions. It is generally appropriate to retain 60 to 100 fruits per square meter of canopy projection area.

Thinning method. The young fruit on the weak tree or weak branches can be removed first, and it can also be cut together with the weak branches; when there are more than 3 young fruits in each inflorescence, depending on the strength of the branch, 2 to 3 can be retained; The crown should be evenly distributed, and the dense inner bore can be more sparse. It should be particularly noted that thinning is limited to early-fruiting walnut varieties with a high fruit setting rate.

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