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To fertilize fruit trees, there is a metaphor for "autumn gold, winter silver, spring fertilization is rotten iron." Autumn is the flower bud differentiation stage of fruit trees, and fruit enlargement also requires a lot of nutrients. Fertilization in autumn is of great significance for restoring tree potential, improving soil structure and fertility, promoting nutrient accumulation in fruit trees, increasing tissue cell fluid concentration, and enhancing the ability of trees to prevent freezing and cold.
First, the principle of fertilization in autumn
　　 1. The autumn base fertilizer should be carried out immediately after picking the fruit clearing. Early-maturing varieties are carried out after fruit harvesting, and mid-late maturing varieties can be carried out before fruit harvesting. Apply no later than one month before the fruit trees fall.
　　 2 , autumn fertilization should be based on organic fertilizer, supplemented by inorganic fertilizer, so that the combination of soil improvement and support, slow-acting and quick-acting complement each other.
　　 3, fertilizer to fertilization, should not be excessive application of nitrogen fertilizer rate effect, otherwise easily lead to winter shoot. At the same time, it is necessary to properly and appropriately apply trace elements. The application of calcium fertilizer can reduce the incidence of diseases such as soft rot of fruit trees, improve the quality of fruit, and facilitate the storage and transportation of fruits. Since the photosynthesis of fruit trees is weakened after bagging, it is not conducive to the absorption of calcium by fruits, and more attention should be paid to the application of calcium fertilizer. . The application of boron fertilizer can significantly improve the fruit set rate and yield of fruit trees, and the effect on fruit tree shrinkage is very significant. The application of zinc fertilizer has a significant effect on the correction of lobular disease in fruit trees.
Second, the amount of fertilizer and application methods
　　 1 , the amount of fertilizer. The organic fertilizer should be fully decomposed, and 2-3 kg of high-quality organic fertilizer should be applied according to the production of 1 kg of fruit , and it is appropriate to apply 3000-5000 kg per mu . Fertilizers should be determined according to the age of the tree. Generally, young tree in an amount of nitrogen fertilizer per pure nitrogen to 0.2 - 0.5 kg, N, P2O5, K2O ratio of 1: 1.2-1.3: 1; the result tree fruit generally required per 100 kilograms of pure nitrogen topdressing 1 kg of pure phosphorus (P2O5) 0.5-0.8 kg, 1 kg (translation of pure potassium (K2O): fertilizer recommendation ÷ fertilizers be effective content = number fertilization, application of urea as the recommended amount of fertilizer applied was 6 kg, should The amount of fertilizer applied = 6 ÷ 46% = 13 kg; the recommended amount of fertilizer applied is 5 kg, and the amount of fertilizer applied should be 5 ÷ 50% = 13 kg).
　　 2 , when ditch application, digging ring, radial shape and other fertilization ditch in the canopy, the ditch depth is 40-50 cm, the ditch width should be determined according to the amount of fertilization, and the ditch bottom should be flat. Before fertilizing, the roots of the exposed grooves should be flattened along the ditch wall, and the cuts should be smooth to prevent the roots from being moldy and rotten. When fertilizing, the fertilizer should be applied layer by layer, leaves and weeds should be placed on the bottom layer, fertilizer should be placed in the middle layer, and the top layer should be placed with organic fertilizer. Each layer of fertilizer should be covered with a layer of soil. Finally, the soil should be higher than the ground 25-30. cm.
　　 3 , the disc method. Adult Orchard disc can be cast, i.e., on the side of the plant apart rake topsoil, Yi Qian near the trunk (8-10 cm) soil when the rake, the more distant from the trunk should be deep (40-60 cm), rake applicator Fertilizer, then cover the soil.
Sepetir is a medium-weight hardwood. The colour of the heartwood is golden brown, darkening on exposure. Dark brown or black streaks are sometimes present, producing handsomely figured wood. The density is (450-)520-790(-900) kg/m3 at 15% moisture content. The grain is straight but more often shallowly interlocked, texture moderately fine and even.
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