Lao Zheng of Zhuoxun Village, Yundian County, Yunmeng County asked: Why did the base of the blade appear red cracks before drawing? Why do pods appear when seeding?
A: Some rapeseeds show that the roots and necks of the leaves of the sunny side are enlarged and the cortex is cracked, showing purple-red cracks, and developing upwards and downwards. The leaves are thick and brittle, the tip of the leaf is rolled down, the buds are green and yellow, some are withered, the petals are shrunk, and the flowering is not normal. The appearance of this symptom indicates that the application of boron fertilizer was neglected in the potential boron deficiency of the soil or the base fertilizer. Rapeseed is very sensitive to boron fertilizer, and adding boron fertilizer can greatly increase yield. The boron fertilizer should be sprayed outside the roots in the middle and late stages of management. It can be sprayed with a 0.1% to 0.2% borax solution or a 0.1% to 0.15% sule boron solution.
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