A water and fertilizer management poured back to Qingshui in early March. After turning green, the plants are bolting. At this time, two tasks must be done. First, the onion flower buds should be removed when they are not open to promote the development and growth of the buds. If the buds are removed prematurely, the buds will not affect the growth; If it is too late, it will consume too much nutrients and affect the yield. Second, some plants with a bolting on the accompanied by budding out of the child, at this time regardless of the bud does not seem open, will always plant the teeth of the plant's flower buds (ie buds) early removal, in order to facilitate the seizure of high yield. When removing flower buds, be sure to protect the flower moss. Because the flower moss not only plays the role of supporting the sprouting onion, but also prevents lodging, it is also an important assimilation organ. Its photosynthetic intensity is higher than that of the same plant leaf, and it produces a large amount of nutrients for the growth of buds. After late March, pay attention to the application of ferrous sulfate, ammonium salt, copper sulfate 1000 times, every 8 days or so, even spray 3 times, can significantly increase production. In early April, 15 kg of urea was applied in conjunction with watering of 667 square meters to keep the soil dry and wet. The green onions transplanted in the middle of the ditch must be cultivated for 1 or 2 times, and the scallions can grow about 10 cm. Two pest control purple spot disease can be used 1.5% bacteria off 800 ~ 1000 times or bacteria Taike 1500 times alternating spray, 7 days spray 1, even spray 2 or 3 times. The disease can be treated with two kinds of medicines. If onion thrips occur, they can be sprayed 1,000 times or 500 times. If onion roots are found, use 1.1% matrine for 500 times, or 90% dipterex for 600-1000 times.
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