What are the fertilizer requirements of apple trees?
What are the characteristics of apple trees? For apple trees, nitrogen uptake usually peaks twice a year. The first peak is synchronous with fruit development and branch growth, that is, with the rapid growth of young fruits and new shoots, the demand for nitrogen is increasing. When the shoots are formed in July and August, the whole leaf area reaches the maximum, and the nitrogen demand reaches the highest peak. At present, it is considered that 0.075~0.25 kg of pure nitrogen should be applied to young apple trees without fruit every year. The optimum amount of fertilizer application is 0.63~0.54 kg urea, 0.25~0.5 kg urea for early fruiting trees, 0.5~1 kg urea for trees in full fruiting stage, 1~1.5 kg urea for trees in full fruiting stage, 2.2~3.2 kg urea. But it must be combined with phosphorus and potassium fertilizer to have the best effect. The application amount of phosphorus fertilizer can reach half of the amount of nitrogen fertilizer according to the effective composition than the annual application amount of nitrogen fertilizer. For example, nitrogen fertilizer application rate is 0.5 kg pure nitrogen per plant per year, equivalent to 1.1 kg urea; phosphorus fertilizer application requires 0.25 kg pure phosphorus (calculated by phosphorus pentoxide). If the available phosphorus of calcium superphosphate is 11%, each plant needs 2.3 kg of calcium superphosphate. The results of multi-point test of national apple fertilizer test network show that. 2∶1∶2 was the best ratio of N, P and K application in mature trees and 2∶2∶1 in young trees. The results showed that young trees needed less potassium and more phosphorus, and the older the fruiting trees were, the greater the demand for potassium, at least not lower than the application level of nitrogen. Orchards should also apply organic fertilizer once a year. Application amount according to the principle of catty fruit fertilizer, in late September or early October each year combined with deep ploughing and hole expansion once applied. The garden has been deeply turned over and applied below the outer edge of the canopy. Organic fertilizer must be decomposed beforehand. Click for more apple tree growing techniques Click for more fruit growing techniques
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What should I pay attention to when bagging crisp pears?
What should I pay attention to when bagging crisp pears? Please introduce that pear bagging is one of the effective measures to produce pollution-free pear fruit and improve the excellent fruit rate. Crisp pear bagging should pay attention to: 1, orchard management before bagging 1. Artificial pollination can make pear fruit good fertilization, form more seeds and form more auxin, which can promote the growth of young fruit.
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What is the apple tree blossom?
What is the method of coloring red Fuji apples? Please introduce that red Fuji apple is a kind of high-quality fruit with red color, delicious taste and high commodity value. To give full play to its inherent characteristics and meet the needs of the market and export, it is necessary to strengthen the management of the coloring period. The fruit coloring of Red Fuji starts earlier and slower than Guoguang.
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