Symptoms Rapeseed is a phosphorus-producing crop that requires more than one-fold more phosphorus than cereal crops. In the absence of phosphorus, the plants are short, with slow growth, delayed leaves, small foliage, dark green leaves, lack of luster, purple-red spots or patches on the edges, leaf veins on the back of leaf petioles and leaves turning purple; poor root development. The number of pods and 1000-grain weight significantly decreased, and the oil yield decreased. In addition, according to hydroponic experiments, if the true leaf of rape begins to lack phosphorus, the leaves of rapeseed are few, and the leaves are small. They can only convulsive, can not be strong, and the particles are not received; the phosphorus deficiency begins at the five-leaf stage, and the yield is reduced, only phosphorus nutrition. 0.44% of the normal supply; phosphorus depletion at the ten-leaf stage, the output increased significantly, 27.8% of the normal supply of phosphorus nutrition.
Remedial measures Phosphorus deficiency at seedling stage, with 25-30 kg of superphosphate per acre topdressing or pouring water, the earlier the better the effect; later with 1% of superphosphate calcium leachate can be sprayed.
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