Rape deficiency prevention method

Phosphorus-deficient purple leaves: Phosphorus deficiency can make plants grow slowly, the leaves are small and thick, the number of leaves is reduced, and the leaves and petioles are purple-red, forming purple-red leaves.

Countermeasure: 20 to 30 kg of superphosphate or 6 to 8 kg of diammonium phosphate per 667 square meters, or 50 kg of 0.2% potassium dihydrogen phosphate solution can be sprayed on the leaves, and sprayed 2 to 3 times.

Potassium deficiency brown leaves: yellow spots at first, edge or brown spots on the edge of the tip, the leaves become thick, hard and brittle, showing a "scalding".

Countermeasure: Apply 8 to 18 kg of potassium chloride per 667 square meters, or spray 50 kg of 0.2% potassium dihydrogen phosphate solution, and spray 2 to 3 times.
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