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Cotton deficiency symptoms and prevention measures
With the increase of multiple cropping index and yield, and the improper proportion of fertilization, the proportion of potassium in soil has been significantly lower in recent years. For cotton, the lack of potassium in the soil will not only reduce the production of cotton fields, but also reduce the quality of cotton fibers, causing economic losses to cotton farmers. The symptoms of potassium deficiency in cotton showed dappled yellowing, weak growth, and dwarf plantlets from the field. When there was a lack of potassium and nitrogen fertilizer, the symptoms were dry scorching of leaves, early shedding, and some of the red ( Yellow) leaf blight. From the perspective of individual plants, the symptoms of potassium deficiency developed from the bottom up, and the symptoms ranged from leaf margin to central, from leaf tip to leaf base. The results showed that the development of the lower fruit branches was poor, the bells were small and small, the middle fruit branches were slightly developed, and the fruit sections were still relatively small, which was in contrast with the normal pagoda plant type. The middle and lower leaves of cotton are characterized by the yellowing and scorching of the tip of the leaf tip, the leaf shrinking, and some forming a "chicken claw shape." The shortage of potassium in cotton caused a significant decrease in early-stage bell-rings, delayed premature aging, a large reduction in production, and poor cotton fiber quality. Control measures to increase potash fertilizer: The application of potash fertilizer should be combined with basal fertilizer and topdressing, with organic fertilizer as the base fertilizer. In the soils with severe potassium deficiency, the proportion of chemical potash fertilizer as the base fertilizer should be appropriately larger, when the cotton field shows the lack of potassium, To timely fertilizer and foliar spray fertilizer. In the peak period of cotton nitrogen absorption (flower and boll stage), topdressing potassium fertilizer should be applied in time to prevent the imbalance of nitrogen and potassium and promote potassium deficiency. Strengthen field management: Promote winter plowing to reduce or eliminate damage caused by reducing substances to cotton roots. On the other hand, it can also promote the release of potassium in the soil to increase the supply of potassium in the soil. In addition, when the use of potash fertilizer is not fully guaranteed, the amount of nitrogen fertilizer should be strictly controlled so as to prevent potassium deficiency in cotton caused by excessive application of nitrogen fertilizer.