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The pear tree fertilizer application technology
First, the need fertilizer characteristics According to years of high yield high quality pear orchard survey, for each production of 1000 kilograms of pears, need nitrogen 4 to 6 kilograms, phosphorus 2 to 3 kilograms, potassium 4 to 6 kilograms. Different ages of pear trees require different fertilizer laws. The main nutrients needed for pear tree saplings are nitrogen and phosphorus, especially phosphorus, which has a good effect on root growth and development. The establishment of a good root structure is a good structure of pear tree crowns. The premise of robust growth. The nutrient requirements of adult fruit trees are mainly nitrogen and potassium, especially because the harvesting of fruits has taken away a lot of nutrients such as nitrogen, potassium, and phosphorus. If they cannot be supplemented in time, it will seriously affect the growth and yield of pears in the coming year. Second, fertilization technology Peach fertilizer application rate should be based on soil fertility, age, variety, yield, climate factors and other flexible determination. In the orchards with low soil fertility, high tree age, and high yield, the amount of fertilization is higher; the fertilization of orchards with high soil fertility, low age, and low yield is appropriately reduced. The varieties are more resistant to fertilizers, suitable for climatic conditions, and have a higher amount of water for moderate fertilizers. On the contrary, the amount of fertilizers should be appropriately reduced. If the application amount of organic fertilizer is more, the application amount of chemical fertilizer should be less. 1. Fertilizer application rate for base fertilizer: Base fertilizer is mainly organic fertilizer, supplemented by chemical fertilizer, and the dosage accounts for about 40% of the annual fertilization amount. The basal fertilization is better than the spring, and the early autumn is better than the late autumn and winter. This is because: 1 At this time, it is the peak of autumn root growth, which can cause early healing of wounds and promote a large number of new roots. 2 It can promote the absorption of autumn roots and the photosynthesis of autumn leaves, increase the storage nutrition level, improve the quality of flower buds and the degree of branch bud filling, thus improving the cold resistance, and the effect is excellent. 3 After the organic fertilizer is applied in autumn and winter and winter, it is decomposed and decomposed, and the fertilizer efficiency is best exerted during the most stressful period of spring nutrient. However, if winter or spring planting, the fertilizer is too late to decompose, which can easily lead to the need for fertilizer in the spring when it is not strong enough. 2. Appropriate topdressing before flowering: Applying it before flowering in early spring, it can promote germination, make flowering neat, reduce flowering and fruiting, and promote healthy growth of new shoots. Nitrogen fertilizer is the main fertilizer used, accounting for about 20% of the annual amount of fertilizer. Left and right, if the application rate of basal fertilizer is high or base fertilizer is applied in winter, fertilizer may not be applied or applied before flowering. Post-harvest top dressing: Mostly applied after flowering, it can effectively increase the fruit setting rate, improve the nutrition of the tree, and promote the rapid growth of the early fruits. The dosage is about 10% of the annual application amount. During fruit enlargement, dressing is applied after the fruit enters the rapid growth period again. At this time, topdressing promotes rapid fruit growth, promotes flower bud differentiation, and plays an important role in laying the foundation for the next year's production. The amount of fertilizer is about 20% to 30% of the annual application amount.
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