The order of occurrence of whole leaves of red leaves 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.
When the dark purple leaves are deficient in phosphorus, the leaves of the plant are small, the leaves are not flat, the leaves are dark green, the petiole is purple, and the dark purple stiff leaves finally become. 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.
Purple leaves begin with the middle and lower leaves and then develop upward and downward. 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 30 ~ 50 kg for foliar spray.
In the case of sulfur deficiency in purple-red rapeseed, the leaf margins have large defects and shrink into cups. The back, veins and stems of the leaves turn purple. Combined with cultivator, 1 to 2 kg of sulphur powder per hectare, or 50 kg of gypsum powder.
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