Citrus fertilization principles:
1. Membaja mengikut kepada the age, vigor and yield of citrus pokok.
During the life of citrus fruit trees, growth and fruiting, senescence and renewal, and aboveground and root systems are often in opposition and unity, all of which are converted under certain conditions. In fertilization, we should pay attention to the changes in the age period, such as the young tree stage is the vegetative growth period, and nitrogen fertilizer should be the main one, and phosphorus and potassium should be paved. Nitrogen fertilizer should be applied less for vigorous trees and more for weak trees. Sufficient fertilizer should be applied to trees that bear more fruit in order to produce more large fruits and increase the value of the commodity. Nutrition should be balanced, according to the growth potential and quantity, reasonably determine the amount of fertilizer, adhere to the principle of "eat less and eat more", each fertilization in about 1-4 taels, the canopy of citrus trees can be used more, and the young trees can be used less, which is conducive to the growth of fruit trees and avoids excessive fertilizer.
2. Membaja mengikut kepada jenis dan sifat daripada baja to improve fertilizer utilization.
Bahagian daripada the baja applied to the soil is wet by rain or fixed by the soil into ineffective nutrients, and the other part is decomposed and volatilized, so it cannot be fully absorbed and utilized by fruit trees. The fertilizer utilization rate is generally 20%-50%. Dan different kinds of fertilizer, its utilization rate is also different, so according to the nature of fertilizer, the appropriate method such as deep or shallow application should be adopted to meet the needs of citrus growth and development in a timely manner.
General organic matter fertilizer or biologi fertilizer, to ditch deep application, cultivation horizontal root deep root, compound fertilizer is generally ditched shallow application is more convenient, do not sprinkle on the surface, easy to cause floating roots, easy to be affected by the outside world.
3. Menyuburkan mengikut kepada the climate.
The nutrient uptake of citrus roots is directly affected by factors such as temperature and moisture, because temperature (air temperature, soil temperature) and moisture directly affect the physiological activities of roots and the activities of soil microorganisms, thereby affecting the transformation, transportation and absorption capacity of fertilizers in the soil. Bila the soil is dry, it is best to drench or apply water and fertilizer before applying chemical fertilizer, so that the root system can more easily absorb nutrients, ensure soil moisture balance, and avoid root breakage caused by cracks in the soil that is too dry, which easy to cause poor growth of fruit trees.
4. Menyuburkan mengikut kepada tanah syarat.
5. Scientific fertilization according to the results of citrus leaf and soil analysis.
Menurut kepada the nutrien status of leaves and soil, as well as the need for nutrients in different growth and development periods of fruit trees, fertilization is guided, and fertilizers containing nutrients are applied to meet the nutrient needs of the tree in a timely manner and reduce the waste of fertilizer.
Menurut kepada the symptoms of citrus leaf deficiency, foliar fertilizer should be reasonably supplemented, and organic fertilizer or bio-organic fertilizer should be used to improve soil and promote roots, improve root vitality, and the root system should absorb nutrients more comprehensively. Magnesium deficiency, or zinc deficiency, or manganese deficiency, or phosphorus and potassium deficiency, etc. , should be supplemented with foliar fertilizer according to the actual situation, and supplemented with winter fertilizer. However, with the use of foliar nutrition, leaves that have already developed symptoms of nutrient deficiency cannot recover, and more leaves can be prevented from developing symptoms.
6. Fertilize according to the phenological period.
Different phenological periods have different nutrient requirements, so it is necessary to pay attention to scientific fertilization according to the phenological period and citrus growth. For example, high nitrogen compound fertilizer should be applied in the spring shoot stage and autumn shoot stage, so that the new shoot is pumped quickly, and the leaves stretch and turn green quickly. After the new shoots turn green and self-cutting, high potassium foliar fertilizer can be sprayed on the foliar surface, for example, balanced compound fertilizer can be supplemented in the flowering and young fruit stage, if the amount of flowers is large, high nitrogen compound fertilizer can be appropriately supplemented, and high potassium compound fertilizer can be used if the amount of flowers is small, so as to restore the tree potential and promote the green and expansion of young citrus fruits. At the same time, the foliar surface is supplemented with free amino acids, foliar fertilizer + potassium dihydrogen phosphate.
During the period from May to July, 2-3 times of agricultural potassium sulfate or potassium magnesium sulfate should be applied to the young fruits, which can effectively avoid the extraction of summer shoots and promote the uniform expansion of young fruits. Foliar rotation is supplemented with high-potassium foliar fertilizer, high-calcium foliar fertilizer, and fish protein fertilizer or rare earth amino acids, the effect is better. If the leaves of the fruit trees are light in early to mid-June, a small amount of balanced compound fertilizer or high potassium compound fertilizer can be appropriately applied. This effectively avoid fruit drop due to nutrient deficiency of the tree, and the fruit is good for fruit expansion. In particular, special attention should be paid to fruit trees that use shoot control agents to control the shoots, or sitrus buah-buahan dengan lebih buah-buahan.