How to apply nitrogen fertilizer to fruit trees
2018-04-25 14:00:37
Effect of Nitrogen Fertilizer on Fruit Trees Cell proliferation and organ construction of fruit trees mainly depend on nitrogen nutrition. Nitrogen nutrition is also an important component of chlorophyll, and chlorophyll plays a major role in photosynthesis of fruit trees. Nitrogen nutrition is sufficient to assist photosynthesis, increase tree nutrients, make branches grow robustly, and leaves are thick and thick; can increase photosynthetic efficiency of leaves, increase organic nutrient accumulation, promote flower bud formation, and have high flowering fruit setting rate, resulting in increased yield. excellent.
Excessive nitrogen in the fruit tree is not suitable for too much nitrogen in the fruit tree, which will cause the loss of balance between carbohydrates and nitrogen in the tree or the imbalance between other elements, resulting in overgrowth of nutrients, excessive growth of leaves, and flower buds. Poor differentiation, serious drop and fruit drop; summer apple leaf nitrogen content of more than 2.5% to 3.0%, delayed fruit ripening, poor fruit coloring, fruit fleshy; sugar content and fruit hardness decreased, intolerant storage, physiological diseases and more , The wintering ability of the tree is reduced.
The lack of nitrogen nutrition in fruit trees will affect the photosynthesis and protein formation of fruit trees. The growth of spring shoots in trees will be slow, the growth of branches will be thin, and the thin and light leaves will cause yellowing of old leaves at the base of shoots and early fall of leaves in autumn. A lot of fruit drop. In the absence of nitrogen, the flowers are small, the fruit setting rate is low, and the fruits are light in color. Long-term nitrogen deficiency will reduce the stress resistance of the fruit tree, and the tree life is short.
Various nutrients should maintain balance and coordinate fruit tree fertilization. Care should be taken to maintain the balance and coordination of various nutrients. A variety of nutrients have promotion and restraint among each other, such as phosphorus deficiency will affect the metabolism of nitrogenous substances; potassium and nitrogen absorption and protein synthesis have a certain relationship, the application of nitrogen fertilizer, phosphorus and potash fertilizer simultaneously, good fertilizer effect .
The effects of topdressing nitrogen fertilizers outside the roots are also followed by topdressing nitrogen fertilizers, which has a significant effect. The application of nitrogen fertilizer out of the apple roots before germination can improve leaf quality and increase photosynthetic intensity. The dwarf rootstock apple tree has low nitrogen content in the root during the germination period. For the short-stocked apple tree, attention should be paid to applying nitrogen fertilizer in the early stage of growth and supplementing the root system to nitrogen deficiency.
Spraying 0.3% urea on the leaves during flowering has a good effect on improving fruit setting rate. Spraying high-concentration urea into leaves in late autumn can increase storage nutrition and benefit the fruit tree's growth and development. In the 2 to 4 weeks after the fruit is harvested and before the deciduous period, foliar spraying of urea will not only help the growth and development of the tree in the following year, but also increase the amount of flowering, and it will also increase the fruit setting rate, so that the tree yield will be of high quality. Therefore, we must pay attention to topdressing nitrogen fertilizer in late autumn.
Determination of the amount of nitrogen fertilizer application Due to different growth stages and different tree vigor, the amount of nitrogen fertilizer needs to be different. Determine the amount of fertilizer to be used according to tree vigor, adjust the ratio of nitrogen to phosphorus and potassium, and determine the amount of nitrogen fertilizer.
Author: Shaanxi Fruit Research Institute
Excessive nitrogen in the fruit tree is not suitable for too much nitrogen in the fruit tree, which will cause the loss of balance between carbohydrates and nitrogen in the tree or the imbalance between other elements, resulting in overgrowth of nutrients, excessive growth of leaves, and flower buds. Poor differentiation, serious drop and fruit drop; summer apple leaf nitrogen content of more than 2.5% to 3.0%, delayed fruit ripening, poor fruit coloring, fruit fleshy; sugar content and fruit hardness decreased, intolerant storage, physiological diseases and more , The wintering ability of the tree is reduced.
The lack of nitrogen nutrition in fruit trees will affect the photosynthesis and protein formation of fruit trees. The growth of spring shoots in trees will be slow, the growth of branches will be thin, and the thin and light leaves will cause yellowing of old leaves at the base of shoots and early fall of leaves in autumn. A lot of fruit drop. In the absence of nitrogen, the flowers are small, the fruit setting rate is low, and the fruits are light in color. Long-term nitrogen deficiency will reduce the stress resistance of the fruit tree, and the tree life is short.
Various nutrients should maintain balance and coordinate fruit tree fertilization. Care should be taken to maintain the balance and coordination of various nutrients. A variety of nutrients have promotion and restraint among each other, such as phosphorus deficiency will affect the metabolism of nitrogenous substances; potassium and nitrogen absorption and protein synthesis have a certain relationship, the application of nitrogen fertilizer, phosphorus and potash fertilizer simultaneously, good fertilizer effect .
The effects of topdressing nitrogen fertilizers outside the roots are also followed by topdressing nitrogen fertilizers, which has a significant effect. The application of nitrogen fertilizer out of the apple roots before germination can improve leaf quality and increase photosynthetic intensity. The dwarf rootstock apple tree has low nitrogen content in the root during the germination period. For the short-stocked apple tree, attention should be paid to applying nitrogen fertilizer in the early stage of growth and supplementing the root system to nitrogen deficiency.
Spraying 0.3% urea on the leaves during flowering has a good effect on improving fruit setting rate. Spraying high-concentration urea into leaves in late autumn can increase storage nutrition and benefit the fruit tree's growth and development. In the 2 to 4 weeks after the fruit is harvested and before the deciduous period, foliar spraying of urea will not only help the growth and development of the tree in the following year, but also increase the amount of flowering, and it will also increase the fruit setting rate, so that the tree yield will be of high quality. Therefore, we must pay attention to topdressing nitrogen fertilizer in late autumn.
Determination of the amount of nitrogen fertilizer application Due to different growth stages and different tree vigor, the amount of nitrogen fertilizer needs to be different. Determine the amount of fertilizer to be used according to tree vigor, adjust the ratio of nitrogen to phosphorus and potassium, and determine the amount of nitrogen fertilizer.
Author: Shaanxi Fruit Research Institute