Rape is the most sensitive crop for boron. Boron deficiency in the seedling stage will bring hidden dangers of “flowers and unrealityâ€, and it is difficult to remedy even if the boron fertilizer is applied during the flowering period. Serious or even bad. The reasons for the investigation of boron deficiency in rapeseed are as follows:
1 Soil factors Soil boron deficiency is the main reason for boron deficiency in rapeseed. When the effective boron content in the soil is less than 0.4mg/kg, it will show the symptoms of boron deficiency. The effective boron content of the soil is 0.5-0.7mg/kg, and boron will still be potential.
2Climate factors Soil drought and damage will increase the soil's fixation of boron, and affect the absorption of boron by rapeseed roots, thus increasing the boron deficiency of rapeseed.
There were differences in boron content between different varieties and growth stages of different rapeseed varieties. Brassica napus hybrids required more boron than other varieties. The absorption of boron by rapeseed increased with the growth period, and with the promotion of high-yield varieties, the amount of boron needed to increase while increasing production. The longer the growth period, the greater the demand for boron, the more sensitive it is to boron, the more likely it is to be deficient in boron. This is because the early-ripening rapeseed varieties on the same field are not deficient in boron, and the late-ripening rapeseed varieties will be deficient in boron during planting. s reason.
4 The layout of the rapeseed will take away a lot of trace elements in the soil, especially boron, which will cause the lack of boron in the malnutrition of the lower rapeseed.
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