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The young period of sapling plum is relatively short, usually 2 to 3 years. Newly planted seedlings should be appropriately increased with phosphate fertilizers to promote root growth and growth. Due to the weak root system of new planting saplings, the application of foliar fertilizers should be strengthened.
In the early fruit period, Li Shu entered the early fruit period earlier and the time was shorter, generally 4 to 5 years. Li tree is very easy to form flower buds, but the proportion of abortive flowers is high, and the flower buds on the development thick and short fruiting branches have a high percentage of full flowering, and the fruit setting rate is high. In this period of nutrient management, we must pay attention to promoting the development of short fruit branches and improve the quality of flower buds, so we must pay attention to the application of organic fertilizers and phosphorus and potassium fertilizers.
During the full fruit period, the plum fruit is large, and it is prone to premature aging after entering the fruit period. In pruning, attention should be paid to improving the light of the internal condole to prevent the internal litchi to die off and the resulting parts to move outwards. Soil management should improve the vitality of the root system by deep-turning the soil, adding organic fertilizers, etc. to prevent the roots from sensation and maintain the robust tree. Potential. Besides nutrient management and supplemental consumption for nutrient management, it is more important to provide adequate nutrition for fruit growth.
2, the amount of fertilizer:
The determination of the amount of fertilizer applied to plums should be based on factors such as yield, tree vigor, and soil fertility (see the table below).
3, fertilization method:
Soil fertility The horizontal roots of plum trees are generally concentrated near the periphery of the crown, so organic fertilizers are generally applied slightly deeper and farther away from the root distribution layer, inducing deep and broad root growth, forming strong root systems, expanding the area of ​​absorption, and improving root absorption. Efficacy and tree nutrient levels.
The plum tree's vertical distribution range is deeper than that of cherries, but shallower than apricot, and the basal fertilizer can be appropriately deepened to improve the fertilizer retention and water holding capacity. Top dressing should be based on the nutritional requirements of the plum tree and the characteristics of the fertilizer, and the nitrogen fertilizer has a strong mobility in the soil. Shallow application; Potassium fertilizer, phosphorus fertilizer poor mobility, should be deep.
Outside the roots top-dressing plum tree top dressing can be combined with the prevention of pests and diseases, but there is no adverse reaction between the two. Spraying time is usually in the afternoon and evening of the day. The main part of the spray is the back of the leaf, which is easy for the leaves to absorb. Jiang Yuanmao, College of Horticulture, Shandong Agricultural University
Li Shu Nutrient Resource Management Technology
1, nutrient demand characteristics: