Recently, Chen Minliang, a kiwifruit grower in Cuifeng Township, Zhouzhi County, Shaanxi Province, called a hotline to report that some of the fruit trees in his kiwifruit orchard began to dry up. This happened last year. Moreover, the tree sap and the yield of the deciduous fruit trees are obviously poor, which makes him very distressed. On this issue, the reporter interviewed Zhang Anmin, technical director of Zhouzhi County Science and Technology Association. Zhang Anmin pointed out that the defoliation of kiwifruit during the fruit-bearing period was mainly caused by the burning of leaves in the summer, the excessive load of the tree, the unreasonable structure of the tree and the disease. For this reason, he proposed the following control measures.
Orchard grass or tree tray cover selection of green manure such as clover and edulis planted in rows, reduce ground temperature, increase air humidity, improve orchard microclimate conditions, and reduce leaf burns and leaves. For the orchard without grass, Zhang Anmin suggested that the straw can be covered with wheat straw, wheat bran, corn stalks, etc., with a thickness of 10-15 cm, and a small amount of soil can be pressed to lower the ground temperature and increase the soil organic matter content and strengthen the tree. Body growth potential.
Thin buds and thin fruit, reasonable load, strict buds and thin fruit, reasonable retention of fruit. Zhang Anmin suggested that the 3m4m row spacing of mature fruit orchards should be about 480 per fruit, and the yield per mu should be controlled at 2200-2500 kg, avoiding excessive nutrient loss and causing tree nutrient deficit.
Reasonable summer shear, strengthen the water and fertilizer management, grow the season, pick up the heart and remove the buds, cut off the ineffective branches and leaves, make the orchard ventilate and transmit well, and the shoot buds grow robustly. According to the reasonable irrigating irrigation, the early morning leaves are not damp and need timely irrigation to ensure that the orchard does not lack water; the rainy season pays attention to drainage and prevents roots. Formulate fertilization according to needs, add organic fertilizer, cultivate strong tree potential, and enhance tree disease resistance.
Timely prevention and treatment of diseases Zhang Anmin pointed out that the pathogens causing brown leaf spot and black spot disease of defoliation generally overwinter on their sick bodies, so in winter, the leaves should be removed in time, and 3 to 5 waves of sulphur sulphur mixture should be used to clear the garden. Small pathogen base. In addition, in the middle and late April of the spring is the initial infection period of the bacteria, Zhang Anmin suggested that you can choose the appropriate fungicide for chemical control, combined with insecticides and spray fertilizer, spray the medicine once every 15 to 20 days, to be meticulous and uniform, And pay attention to the use of drugs alternately to prevent the emergence of resistance to bacteria.
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