Diagnosis and remedy of boron deficiency in rape

Boron is one of the essential nutrients for the growth and development of rapeseed, and its boron content is 32.5-36 times higher than that of wheat and rice and other grasses. When there are more plants in the field, it will reduce the production of boron by at least 2-3%. Almost no time. The symptoms of boron deficiency in rapeseed are very different due to different levels of boron deficiency. In severe cases, the seedlings are atrophied and die, and lighter ones develop symptoms after flowering. The roots of the diseased plants are stunted. The fibrous roots are not long, the epidermis turns brown, some root and neck enlarge, and the cortex cracks. The leaves become dark green at first, the leaf shape becomes smaller, the leaf mass becomes thicker, becomes brittle, the leaf ends are rewinded, and the leaf is not flat. Then it turned purple from the edge of the lower middle blade and developed towards the inside, forming a block of blue and purple spots. Finally, the entire leaf turns yellow and falls off early. After twitching, the growth point atrophies or dies, the blastocyst splits, the transmission system and fertilization are disrupted, carbohydrates are trapped in the leaves, the flowering is slow, the inflorescences are shortened, the small branches are clustered, the flowering is not robust (commonly known as “spiritual”) or kernels Not full, short ripe fruit, such as radish angle. The epidermis of keratinocytes and stalks turned purple or blue-purple, with vertical cracks in the middle and lower cortex of the stalks and cracks in the upper part. Prevention and remedial measures: 1 Boron-poor soil, 0.5 l kg Borax was used as basal fertilizer for site preparation; seedlings were transplanted with rapeseed, and 15-25 kg of Boron-Magnesium fertilizer was applied before transplanting, with good results. 2 In rape seedlings, before bolting, during the early flowering period or when boron deficiency was found in the plants, foliar spraying with 0.10.2% borax was used.

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