Knowledge of rapeseed deficiency

The long growth of rapeseed before bolting has a great influence on rapeseed yield.

By observing the changes in the leaf color of rapeseed, we can understand the growth of rapeseed in a timely manner and take targeted measures to promote the steady growth of rapeseed and lay a foundation for seizing the rape harvest.

1. Red leaves: The order of occurrence of the whole plant begins with the old leaves and then develops towards the new leaves. One leaf occurs in order: gradually extending from leaf margin to whole leaf. The reason for the occurrence of nitrogen deficiency, can be applied per acre 8 to 10 kg of urea or ammonium bicarbonate 15 to 20 kg.

2. Dark purple: In the absence of phosphorus, the leaves of the plant are small, and the leaves are not flat. The dark green leaves are dark, the petiole is purple, and the dark purple stiff leaves are finally formed. The whole plant withered and died. Per acre can be superphosphated 20 ~ 30 kg or foliar spray 0.3% potassium dihydrogen phosphate solution 2 ~ 3 times.

3. Purple leaf: Start with the middle and lower leaves and then develop upwards and downwards. The leaves have a dark green color and a small leaf shape. The leaves are thick and brittle. The leaf margins are reeled, and the leaves are purplish red to violet-blue, and finally develop to purple-blue spots. This is due to the lack of boron, 0.1% to 0.2% per acre borax or boric acid solution 50 ~ 60 kg for foliar spray.

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