Rapeseed lack of recovery

Rape enters the early spring field tube stage, due to improper fertilization during planting and transplanting or lack of a certain nutrient elements in the soil, causing poor growth of rapeseed, if not promptly taken remedial measures, it will affect the yield.

The general lack of rapeseed

Nitrogen deficiency. In the absence of nitrogen in rapeseed, the leaves are yellowish and weak, and the plants are short. In general, nitrogen deficiency and red leaves are prone to occur when drought and fertilizer are released.

Remedial measures: Apply 7.5 kg urea per mu, or 15 to 20 kg of ammonium bicarbonate water 500-700 kg.

Phosphorus deficiency. Rapeseed plants lack phosphorus, grow slowly and dwarf, the leaves become smaller, the leaves become thicker, and the leaves are dark green or gray-green, lacking luster. Petiole purple, purple veins spots or plaques. The leaves had q2-3 pieces less than normal plants, and the bolting was slow and the moss color was red.

Remedial measures: top-up superphosphate 25-30 kg per acre, or continuous spraying of potassium dihydrogen phosphate 2-3 times.

Potassium deficiency. The shortage of potassium in rape began with the old leaves and developed toward the heart. The yellow spots initially appeared. The "focal edge" and the pale brown spots gradually appeared on the tips of the leaves and leaves. The leaves became thicker, harder, brittle and the tissues of the leaves were presented. Obviously "scald" followed by wilting. These tissues remain brown after they die.

Remedial measures: Apply per gram of 7.5-10 kg of potassium chloride to water 500-700 kg of transfusion or 100-150 kg of ash.

Boron deficiency. Rape needs more boron, but the amount of boron in the soil is less, so rape is most likely to lack boron. The boron-deficient plant roots ceased to grow, with no root hairs and lateral roots, some with small nodules, and the root bark turning brown. Purple patches or blue-purple patches appeared on the leaves, leaf margins were recurved, and rhizomes were enlarged. Boron deficiency during flowering will appear "flower but not real", which means that after flowering, there is no scarring.

Remedial measures: Use 150-200 grams of borax for 150-200 kilograms of water per acre, or 50-100 grams of borax for 50 kilograms of water sprayed on a sunny afternoon.

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