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Phosphorus deficient leaves are slow, leaves are small, dark green. The lower leaves and petioles of the lower leaves are purplish red, and the roots are slowed down. Poor resistance to stress, not normal precocity. The grain is not full, the yield is reduced, and the oil yield is low.
Potassium-deficient plants are short. Initially the leaves were dark green and the leaf edges began to curl down, even worse in dry and hot weather. In the future, when potassium deficiency is severe, white spots appear on the outer edge of the leaves, and the old leaves dry before maturity. The pods are small and the yield is reduced.
There are purple-red plaques on the middle and lower leaves of magnesium deficiency, and the leaves are yellow-purple and green-purple.
The sulfur-deficient plants are short, the leaves are light green, and the back of the leaves turns red. The leaves are erect or curled, the growth period is late, and the flowers are small and small. The tip of the pod is dry and about half of the seeds are stunted.
Boron-deficient plants grow slowly and are dwarfed. The stem is long and thick, and the wood is damaged. In the case of mild boron deficiency, blue-violet spots appear between the veins, and purple plaques are produced on the edge of the old leaves. Malformed buds and atrophic flowers appear. The top is continuously flowering, the flowering period is prolonged, the pods are few, and the fruit is not strong. It is commonly called "flowers and not real". Rational application of various fertilizers can increase rapeseed yield and income.
Indispensable fertilizer for rape
The nitrogen-deficient plants are not prosperous, short and thin. The branches are short and the whole plant is large and small.
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