How to determine the amount of fertilization of pear trees
The fertilization amount of pear trees should be determined according to the age of the tree, the size of the canopy, the growth and strength, the number of results, the fertility of the soil, and the amount of fertilization over the years.
Japanese pear: 5-year-old sapling, 667 square meters area rate fertilization amount is 8 kg of nitrogen, 4 kg of phosphorus, 6 kg of potassium; 567 square meters of area with an output of 2,500 kg of 18-year-old oyster pear, each producing 100 kg of fruit, various The absorption of nutrients (0.47 kg of nitrogen, 0.23 kg of phosphorus, 0.48 g of potassium, 0.44 kg of calcium, 0.13 kg of magnesium, and a ratio of nitrogen, phosphorus and potassium of 1:0.5:1).
For the production of 100 kilograms of pear fruit, the pear should be applied with 0.3 kg of pure nitrogen, and the ratio of nitrogen, phosphorus and potassium is 1:0.5:1. For every 100 kilograms of fruit produced by Qiubai pear, 0.5-0.6 kg of pure nitrogen should be applied. For every 100 cubic meters of crown volume (canopy volume), about 2 to 2.5 kg of pure nitrogen should be applied. The output of 667 square meters of avocado is 4000 kilograms. When the output of 667 square meters of pears is 5,000 kilograms, the area of ​​667 square meters requires 22.3 kilograms of pure nitrogen. The sand loam soil and pear garden, 667 square meters area of ​​nitrogen application within 35 kg, each additional l dry grams of pure nitrogen, can increase the yield of 123 kg of avocado; sandy loam a loam pear garden, 667 square meters area of ​​pure nitrogen within 30 kg, each increase Applying 1 kg of pure nitrogen can increase the yield of pear fruit by 179 kg.
The amount of fertilization of different pear varieties can be considered as follows: the general result is that the pear garden needs to be fertilized for every 100 kilograms of pear fruit produced: 100-200 grams of organic fertilizer, or 30-40 kilograms of green manure; 5 l dry grams, 1 to 2 kg of superphosphate, and about 1 kg of potassium sulfate. The fertilization amount of young trees is about 20-30 kg of organic fertilizer and 0.2-0.5 kg of urea. The soil fertility is poor, or in the rainy areas of the south, the amount of fertilizer should be increased appropriately.
The amount of fertilization of pear trees can also be determined based on leaf analysis. According to the analysis of the leaves of high-yield and stable-yield pears in Changli Fruit Tree, Hebei Province, the total nitrogen content is 2.0%-2.20%, phosphorus is 0.13%-0.25%, and potassium is 1.2%-2.6%; when an element is significantly high or low At this level, the amount of fertilizer should be adjusted as appropriate.
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