Symptoms identification: Rice lacks potassium, starting from the lower position erythematous focal point and spots, and gradually expand the upper position of the foliage, in serious cases when the red rice field leaves resembles a kind of fire. The plant height decreased, the leaf color was dark, heading was uneven, the rate of spike formation was low, the panicle was small, the seed setting rate was poor, and the grain was not full.
Due to different cultivation seasons, varieties, and soil conditions, potassium deficiency can also present the following three symptoms or diseases: First, potassium deficiency type blight, or “bronze disease,†occurs during the return period of the climatic period; second, potassium deficiency type brown Spot; Third, potassium deficiency type leaf spot leaf disease.
Prevention methods: Reasonable application of potash fertilizer, increase the amount of potash fertilizer application; reasonable mix of nitrogen, phosphorus and potassium, increase of potash fertilizer ratio; application of bio-potash fertilizer; strengthening of field management, timely airing of field, enhancement of soil permeability, and improvement of root activity and absorption capacity.
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