The stored nutrition of the tree body has a significant impact on the successful completion of the processes of germination, flowering, tapping, leaf spreading, rooting, fruit setting, fruit formation, etc. over the winter and the next growing season, as well as its quantity and quality. Therefore, dedicating to improving the storage level has an important effect on the quality and yield of fruit trees. During the year, most of the nutrients produced by the leaves are stored during the period from the harvest of the fruits to the leaves.
Therefore, the following measures should be taken to improve the nutritional level of winter tree storage:
Early application of base fertilizer
Basic fertilizers are mainly organic fertilizers, such as humic acid fertilizers, composts, ring fertilizers, compound fertilizers, green fertilizers and crop straws. The base fertilizer should be applied in autumn. Generally, early-maturing varieties are harvested after harvest, and middle- and late-maturing varieties are harvested before harvesting. The application of basal fertilizer in autumn is at the second or third growth peak period of the root system. At this time, the wounded root is easy to heal. Some small fine roots that are cut can play the role of root pruning and can promote new roots. If you add appropriate amount of quick-acting fertilizer when fertilizing, the effect will be better.
Post-harvest watering
Watering in autumn and winter in arid areas helps to decompose fertilizers and facilitates the absorption of root systems, thereby promoting the later growth and development of fruit trees and improving the storage and nutrition level. For most deciduous fruit trees, it is not advisable to water before the harvest time, so as not to reduce the fruit quality and cause cracking.
Topdressing
Also called foliar spray fertilizer. This method is simple, easy to use, small in amount, quick to function, and not easily affected by the nutrient distribution center. It can meet the urgent needs of fruit trees in time, and can prevent certain elements from being fixed in the soil. Applying 300 times solution of ammonia and compound micro-fertilizer to the root can increase leaf photosynthetic intensity by 1.5 times. The response of the leaves to the fertilizer elements was most obvious 10 to 15 days after spraying, and then gradually decreased until 25 to 30 days after spraying. Topdressing outside the root can also improve leaf respiration and enzyme activity, so it can improve root development, enhance absorption capacity, and promote the overall metabolic process of fruit trees. Therefore, top-dressing outside the fruit after harvesting has a better effect on improving the nutrition of the tree, but top-dressing outside the root cannot replace soil fertilization. The two have their own characteristics and complement each other. The application method can exert the best effect of fertilizer.
Protection blade
Immediately after the fruit is harvested, a 200-fold dilution of Bordeaux solution is sprayed, which can prolong leaf life, increase leaf photosynthesis, and increase the nutrient accumulation of the tree.
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