Poor lighting conditions Many orchards are densely planted and closed, the scenery and conditions are deteriorating, and the fruit is not well colored due to the lack of light or too little light. This is one of the main reasons for the poor coloration of apples. The poor coloring of the fruit in the inner knot and the lower skirt is caused by this reason. For this kind of situation, the closed plantation must be closed.
Unbalanced supply of nutrients This is another important reason for the poor coloration of apples. The nutrient requirement of apple tree is N: P: 1 ratio of 1:0.5:1. The nutrient status of the apple tree is low nitrogen, high phosphorus and potassium deficiency. Potassium deficiency and potassium deficiency can lead to poor coloring of apples, and magnesium deficiency can cause chlorosis in apples. Some fruit growers do not understand this well. There are blindness in fertilization, and they are not done in accordance with the technical requirements of balanced formula fertilization by soil testing formula. For a long time, heavy inorganic fertilizer is used for light organic fertilizer, and diazo light phosphorus is not applied with potassium or with little potassium fertilizer. Fertilizer, resulting in various nutrients needed for fruit growth and development can not be a balanced supply, thus affecting the yield and quality of fruit.
Insufficient moisture Adequate water supply is an important ecological factor that promotes the coloring of apples. During the apple coloring period, in case of drought-free and rainy weather, timely irrigation should be conducted to increase the humidity in the orchard and promote fruit coloring. At the same time, good orchard humidity can also adjust the temperature difference between day and night in the orchard, thus promoting coloration. During the coloring period, the coloring in the open air is faster and better. If there is no dew or less in the open air, the coloring will be slower and worse.
Too much load The excessive load is not only easy to cause size, but also the quality of fruit. Due to the crowded fruits, the light is blocked and the coloring is not complete. The correct method is a reasonable load, and a relatively easy method to grasp is the spacing and fruit retention method. That is, large apples are left with 2 apples at a spacing of 20-25 cm, and small apples are left with an apple at a distance of 15-20 cm. General yield control in 3000 ~ 4000 kg is appropriate.
Pruning in summer and autumn is not timely The task of pruning in summer and autumn is to cut off the erect long branches, leggy branches, over dense branches, cross branches and overlapping branches, etc., to improve the scenery conditions, promote photosynthesis, balance tree nutrients, and reduce nutrient consumption. If you do not cut or cut too late, it will affect the coloring. This work should be completed at the latest before the bag is removed to promote coloring.
Picking up leaves, turning fruit, laying reflective film and other coloring measures are not good enough to take off the bag, should be promptly removed from the fruiting leaves and shading leaves, so that the fruit see light. The positive surface coloring of the fruit is better in time and fruit is transferred, and the fruit is well padded so that the fruit surface is evenly colored. Laying the reflective film can make the fruit on the inner and lower skirts of the dense garden complete, so as to promote the coloration of the preserved fruit.
Poor bagging quality, not grasping the opportunity of bagging and unpacking. Poor quality paper bags are poor in shading, are not resistant to rain erosion, and are easily broken. They do not inhibit the formation of chlorophyll and promote the synthesis of anthocyanins. After is not conducive to apple coloring. High-quality double-layer paper bags with good shading and rain-resistance should be used, such as Japanese Kobayashi bags or outer bags, yellow inner black bags, and red double-sided paper bags. Premature and late bags are not conducive to coloring.
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