Tobacco tobacco is a typical good potassium crop. In the absence of potassium, in addition to the macula and chlorosis between the veins, the severe loss of water, tissue contraction, and downward curling of the leaves (as opposed to upward curling of soybeans) often occur. In addition, potassium-deficient tobacco leaves will become smaller, and the elasticity and combustibility will decrease.
The initial symptoms of potassium deficiency in cotton cotton are yellow spots on the old leaves or chlorosis between veins along the leaf margins. As the degree of potassium deficiency becomes worse, the leaf margin tissues will dry up and the leaves will bend upwards or downwards. Due to the rust-brown necrotic tissue on the leaf surface, the symptoms at this stage are also called "cotton rust." Because of the lack of potassium in cotton, bolls are poor in boll opening.
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