The top dressing is also called foliar spray fertilizer, that is, the chemical fertilizer is formulated into an appropriate concentration, sprayed onto the leaves and branches with a sprayer, and directly absorbed and utilized through the lenticels, pores, and cortex, eliminating the need for root absorption and transportation. the process of.
Save labor and fertilizer, quick results
After a few hours of urea spraying, it can be absorbed, and it can absorb 80% in 24 hours. After 2~3 days, the leaves turn green. In production, the “bright leaf fertilizer†effect is excellent in May after falling flowers.
Overcome nutrient competition
Spray fertilizer can overcome the nutrient competition of the central distribution caused by the various growth peaks. The medium and short branch leaves can be directly absorbed and utilized to form more flower buds, especially for young and old trees. Nutrient accumulation, flower growth and more obvious production, in the lack of trace elements in the pear orchard, the effect of spraying fertilizer is the most appropriate.
Improve fertilizer utilization
Spraying fertilizer can prevent the loss of fertilizer due to soil fertilization by soil, or the disturbance of soil physical and chemical properties, which can greatly improve fertilizer utilization.
Increase local nutrient accumulation
Spraying fertilizer combined with summer flowering measures such as pulling branches and ring stripping increases the local nutrient accumulation of treated branches, and promotes flower yield increase. In the pear orchard lacking trace elements, the effect of spraying fertilizer is the most appropriate.
Foliar spray fertilizer is 0.3% urea, which can be sprayed from spring to autumn, and urea can be added in combination with spraying. Followed by spraying 2~3 times of potassium dihydrogen phosphate 0.3%~0.5% after physiological fruit drop to harvesting period. In order to improve the effect, it is best to spray the fertilizer early and late in the windless sunny day to avoid spraying at noon to prevent the high temperature from causing phytotoxicity. Due to the differences in variety and geographical and climatic conditions, pay attention to the first time after spraying, and then spray it on a large area.
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