Whether rape is deficient in boron can be judged by observing roots, leaves, stems, flowers and fruits.
First look at the "root". When the soil is seriously deficient in the seedling stage, the young roots stop growing, there is no root hair or lateral roots, the root bark becomes brown, and the cortex is cracked.
Secondly, look at the "leaf". In the seedling stage, the young leaves are chlorotic and brown, spreading to the whole growth point, and it is easy to become a dead seedling. In the middle of the flood season, the middle part becomes dark green, the leaf quality is thickened, brittle, rewinding and shrinking. The leaf edge turns purple and then turns blue-violet, and the leaves fall off in advance. Brassica napus extends from the leaf margin to the whole leaf with a purplish red color. During the wintering period, the red leaves appear more in the middle and lower parts. After the flowering period, the middle and upper functional leaves also appear purple due to boron deficiency.
The third is to look at the "stem". The stem of the boron-poor rapeseed has a slow extension or longitudinal fracture, and the growth of the stem is stagnant. In severe cases, the xylem hollow is yellow-brown or swollen. Longitudinal cracking occurred in the middle and lower cortex of the stem.
The fourth look at "flowers", rapeseed "flowers and not real" is a typical symptom of boron deficiency. In the flowering stage, the flower buds at the top of the inflorescence are greenish and yellow, atrophic and dry, or detached, and the flowering is abnormal. No seeding or formation of only a few deformed horns, the yield is sharply reduced or rejected. Normal rape leaves contain more than 20 mg/kg of boron, while boron-poor leaves have boron content of less than 10 mg/kg.
Huaxian Agricultural Technology Promotion Center Luo Junying
First look at the "root". When the soil is seriously deficient in the seedling stage, the young roots stop growing, there is no root hair or lateral roots, the root bark becomes brown, and the cortex is cracked.
Secondly, look at the "leaf". In the seedling stage, the young leaves are chlorotic and brown, spreading to the whole growth point, and it is easy to become a dead seedling. In the middle of the flood season, the middle part becomes dark green, the leaf quality is thickened, brittle, rewinding and shrinking. The leaf edge turns purple and then turns blue-violet, and the leaves fall off in advance. Brassica napus extends from the leaf margin to the whole leaf with a purplish red color. During the wintering period, the red leaves appear more in the middle and lower parts. After the flowering period, the middle and upper functional leaves also appear purple due to boron deficiency.
The third is to look at the "stem". The stem of the boron-poor rapeseed has a slow extension or longitudinal fracture, and the growth of the stem is stagnant. In severe cases, the xylem hollow is yellow-brown or swollen. Longitudinal cracking occurred in the middle and lower cortex of the stem.
The fourth look at "flowers", rapeseed "flowers and not real" is a typical symptom of boron deficiency. In the flowering stage, the flower buds at the top of the inflorescence are greenish and yellow, atrophic and dry, or detached, and the flowering is abnormal. No seeding or formation of only a few deformed horns, the yield is sharply reduced or rejected. Normal rape leaves contain more than 20 mg/kg of boron, while boron-poor leaves have boron content of less than 10 mg/kg.
Huaxian Agricultural Technology Promotion Center Luo Junying
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