First, pear tree fertilization characteristics
The sprouting, flowering, fruit setting, and the formation of short shoots of pear trees all require large amounts of nutrition, while the roots of pear trees are sparse and their fertilizer performance is slow. Therefore, it is necessary to use autumn basal fertilizer to store a large amount of nutrients in the tree body, and add fertilizer in the early spring to meet the needs.
Autumn basal fertilization is performed after the fruit is harvested, and an appropriate amount of nitrogenous fertilizer is added at the same time. Top dressing is early, chase quick-effect fertilizer, fertilize evenly, in order to absorb. The sand reserves fertilizer and water conservation are poor. The nutrient consumption of the old year tree is large. Therefore, applying topdressing in the bright leaf stage will help flower bud differentiation.
Pear trees absorb the same amount of nitrogen and potassium. Phosphorus absorption only accounts for 1/4-1/3 of the total fertilizer. Increasing phosphorus and potassium fertilizers in high-yield pear orchards have obvious effects on increasing yield, quality, and enhancing tree resistance.
The determination of the amount of fertilizer: every production of 50 kilograms of pears requires 0.15 kilograms of pure nitrogen, and the ratio of nitrogen, phosphorus, and potassium is 1:0.5:1. During the period of fertilizer demand, a large amount of nitrogen fertilizer was consumed in the early stage, which is the basis for determining the amount of fertilizer. Fertilization should be dominated by organic fertilizer, generally high-yield farm acres (1 mu = 1/15 hectare, the same below) 500 kg of composted soil, and evenly mixed with superphosphate 200 kg; a large number of results of pear orchards, 50 kg of urea per mu You can.
Second, Shi Pear before the fertilizer
In March, the pear tree has entered its embryonic stage. This fertilization is mainly to promote sprouting, make it flowering neatly, reduce falling fruit in later stages, and promote robust growth of new shoots. Especially for trees with weak tree vigor and fruitful results last year, budding and flowering are more important. Therefore, we should seize this crucial period and apply the pear tree before flowering.
This fertilizer is mainly based on available nitrogen fertilizer, and it is suitable for phosphate fertilizer, accounting for 20%-30% of the annual fertilization amount. According to strains producing 25-50 kilograms of fruit juice, 1.5 kilograms of calcium phosphate and 75-100 kilograms of human and animal manure should be applied. While fertilizing, water should be poured to promote the absorption of nutrients.
In the early flowering to full flowering period of pear trees, it is also possible to use extra-root fertilizer, which has significant effects on the increase of leaf bales and leaves, the enhancement of photosynthetic efficiency of leaves and the improvement of fruit setting rate. Fertilization methods: (1) urea 0.1% -0.2%; potassium dihydrogen phosphate 0.1% -0.2%; superphosphate leaching fluid 1% -2%. (2) Victoria b hydrogen acid rare earth 1000 times, that is, 50 grams of water 50 kg spray and canopy (can not be mixed with other pesticides, fertilizers).
Third, Shi Li pear fruit fertilizer
1. Before and after fruit picking at the end of July, apply 1 available nitrogen fertilizer and P and K fertilizers. The amount of fertilizer applied accounts for 20%-30% of the whole year. According to strains producing 30-40 kg, the strain applies 0.3 kg of urea, 1.5 kg of superphosphate, 0.1-0.15 kg of potassium chloride or potassium sulfate, plus 50-70 kg of decomposed human-animal water and fertilizer, or 30-50 kg of green grass and green manure. . After fertilizing the nests, the water was irrigated in a timely manner and covered with straw, straw, and vines to protect the drought.
2, in September-October, early basal fertilizer, rejuvenation tree vigor. The method is: in the water crown of the pear tree crown, a circular fertilization nest with a length of 1 meter, a depth of 0.3 meters, and a width of 0.4 meters is relatively opened. The results of adult trees, the strain applied to mature human and animal husbandry, water and fertilizer 80-100 kg, 2 kg of cooked oil cake fertilizer, superphosphate 1-1.5 kg, and then irrigation 100-150 kg. The tree is cut in half.
From July to September, spray the canopy with 0.1%-0.15% of green potassium, or 0.2% of potassium dihydrogen phosphate, and 0.3% of urea mixed fertilizer, once every 10-15 days, for 4-5 times, to prevent Early leaves and restoring tree vigor.
Produce the designed circuit board, then paste all the driver ICs, prepare all the corresponding LEDs, and then prepare to start the assembly line to start the operation. The AI vertical machine starts to insert the lights, the DIP starts, and all the LEDs Knit the tape, then put it in the Universal vertical machine, start to insert the LED directly, according to the set procedure, insert the entire LED board.
After all the completed P16 full-color display modules have passed the company's quality management inspection, and there are no problems, the product is put into wave soldering, and then all the LED pin tubes are completely soldered. The environmental protection is used. Lead tin.
All the soldered full-color display modules begin to work on the assembly line. All accessories, such as the angle of the signal line of the line driver, and various power sockets, and the entire light board, if there are any, crooked The oblique LED lamp bead will right and level the LED lamp bead for comprehensive inspection.
The color of the lamp beads of the P16 module can be customized. The module can be used in a single module or in a combination of multiple modules. When multiple modules are used in combination, the positive pole of the power cord between the two modules is connected to the positive pole (red ), the negative pole is connected to the negative pole (black); the signal is connected through the signal line.
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