Rape is the main oil crop in winter in our province. Some mountainous regions, semi-mountainous regions, and parts of the plains often produce “flowers but not realitiesâ€, which reduces the yield of rapeseed. After the application of boron fertilizer, the yield increased significantly. This is mainly due to the lack of boron in the soil. • Boron deficiency appears to have different symptoms depending on the time period. Severe boron deficiency occurs at the seedling stage and during the mossy period. Symptoms appear after 10-15 days of transplanting. Root tips of the seedlings produce nodules. The root bark is brown, the root neck is enlarged, the cortex is cracked, and the young leaves are browned. , spread to the growing point that is dead seedlings. Symptoms of oilseed rape show signs of swelling of the root neck, cracking of the cortex, thick and brittle leaves, reversal of leaf margins, uneven foliage, yellow leaf tissue along the veins, and purple-blue spots on the leaves. The symptoms of boron deficiency during flowering are floral degradation, failure to flower normally or flowering, resulting in malformation. There are only a few large grains of rapeseed in the pod. The late lack of boron also showed a swelling of the root and neck cracks, longitudinal cracking of the stem cortex, pod skin and stem blue and purple patches. ? Prevention and treatment of boron deficiency in rape, in the cultivation techniques, first of all to apply organic fertilizer before winter, pay attention to the application of rape wax fertilizer, increase soil organic matter and effective boron content. Spring wax used in rape, the rape in the peak period of boron - bud period has enough supply of boron and various nutrients. Before winter, we must strengthen the cultivation and management of rapeseed, to achieve "opening eight leaves, eight-inch crown diameter, no bolting during the year, no red leaves Gaidian" - winter strong spring hair. Secondly, borax can be used outside the spraying, the borax with a small amount of heat to dissolve water, dubbed a 0.2% borax solution, sprayed once in the Daejeon seedling period and the sorghum period, severe boron deficiency areas can be sprayed once again in the early flowering period. (Xiong Jinmu, Shaoxing County Agricultural Technology Promotion Center)
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