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Control Technique of Unknown Dropping Fruit of Dehong Grapefruit
Dehong Prefecture is located in the southwest of Yunnan Province. The average annual temperature is 19°C～20°C; the annual accumulated temperature of ≥10°C is 6400°C～7629°C; the annual rainfall is 1300～1600mm, but the winter and spring (November of the first year to April of next year) is as dry as the whole province, The rainfall is less than 10% of the annual rainfall. Therefore, in general, it is the most suitable area for citrus production, but in fact it needs some remedial measures, especially the production of grapefruit. First, water control in the winter, orchard soil maintenance in the spring, and flood prevention in the summer. In winter, the roots and shoots of grapefruit gradually stop growing, which is a critical period for flower bud differentiation. Irrigation must be controlled to promote flower bud differentiation. Generally, filling the water once after harvesting the fruit will help restore the tree vigor. At other times, it will not require irrigation. Spring is in the period of spring sprouting, flower development, flowering and young fruit development. It needs more water and needs multiple irrigation (especially extreme drought spring) to maintain the moist orchard of the orchard, which will help improve the quality of the flower and sip robustness. The spring shoots increase the fruit-setting rate of the year and lay the foundation for the development of a robust mother-bearing result next year. After the beginning of summer, it is the physiological fruit drop and fruit enlargement period of pomelo. At this time, it is the rainy season, especially in July and August, when there is heavy rain or heavy rain. If the water in the orchard takes too long, it is prone to rot and exacerbates physiological fruiting. After the rot, the tree vigor is not easy to recover, and the fruit grows slowly and seriously. Yield. Therefore, flood discharge trenches and vertical and horizontal drains must be repaired in the spring. Second, the grapefruit's unclear fruitfulness lies in the fact that it has not implemented good measures for keeping flowers and fruits. This needs to do the following: 1. Pay attention to the management of fertilizer and water during spring flowering and young fruit. After a long period of low temperature and drought in winter, the spring temperature gradually rises, and the grapefruit's roots slowly knives: it begins to return to normal growth. At this time, the farmyard manure is fully decomposed and diluted into thin water and fertilizer applied around the rhizosphere. However, to avoid excessive rooting and affect the germination of new roots. At the same time, we must strictly control the application of available nitrogen fertilizers, especially juvenile fruit trees and some strong trees, do not apply fast-acting nitrogen fertilizer or only use available nitrogen fertilizer for extra-root fertilizer. For example, if too much nitrogen fertilizer is applied during the flowering period and during the flowering period, it will easily cause the long growth of the styles and the overheating of the spring shoots, which is not conducive to flower protection and fruit protection. Dehong has a severe drought in the spring and combined with fertilization, orchards need to be moistened in a timely manner. Regulate the acidity of the soil and promote the normal growth of grapefruit roots. Pomelo is suitable for slightly acidic soils with pH 6.5, but most orchards in these subtropical regions of Dehong are acid acids. For these soils that are too acidic, combined with fertilization, certain limes are applied to each plant, and some can be applied to 1～. 2 kilograms to regulate the acidity and promote the normal growth of grapefruit roots, which will help preserve the flowers and preserve the fruits in the spring. 3. Flowering bee, artificial pollination, increase fruit setting rate. Due to weak self-fertilization ability of Shatianyou, Sangmao pomelo, and padjiang pomelo and other varieties, in addition to setting the pollination tree and flowering bee at the flowering stage when planting, artificial pollination is also required. For example, Shatian pomelo is better to use pollen collected on the day. A new brush gently spots pollen on the style to help increase fruit set. 4. Sparse increase fruit setting rate. In adulthood, grapefruit tends to take a large amount of fruit and has a low fruit setting rate. According to investigations, some grapefruit trees can reach 10,000 or more, and thus the proportion of flowers and leaves is seriously out of balance. In order to reduce the unnecessary consumption of tree nutrients, when the flower buds in most panicles have the general size of the match head, they can be sparsely flowered, and the sparse flower buds can be used first, followed by sparse flower buds. The principle is to keep weak and strong, to go to the tail to stay in the middle, and to properly remove the overgrown nutrition spring shoots, so that the tree to reduce nutrient consumption, the relative concentration of nutrients on the robust flowers, the formation of a uniform distribution of fruit in the crown, Three-dimensional results, improve fruit setting rate, increase production. 5. Add trace elements to help preserve fruit. When the young fruit peel of the grapefruit appears brown or dark spots, the mesocarp has white streaks, and yellow-brown jelly accumulates, and small nodules on the surface of the fruit, fruit shape is not correct, young fruit is hard and other symptoms, can be The trace element is added at the end of flowering stage or young fruit stage, and 0.1% to 0.2% boric acid or borax; 0.1% to 0.2% magnesium sulfate; and 0.2% to 0.3% potassium dihydrogen phosphate are mixed to perform the top dressing. To benefit the fruit. 6. Ring circumcision or circumcision protection. When the pomelo buds are exposed in the middle and late March, use 14-15 iron wires to wrap around the stem or main branch so that the nutrients produced by the leaves cannot be transported through the bark tube to the roots, so that nutrients can accumulate on the branches. On leaves, flowers and fruits, to promote rapid expansion of young fruit, not easy to turn yellow off, and then increase the fruit setting rate, but immediately after fixing the fruit tie bar.