1. Insufficient potassium input
The shortage of potassium in soil is the main reason for the deficiency of potassium in broad bean, and potassium nutrients mainly depend on organic fertilizer. In recent years, the proportion of organic fertilizers has continuously decreased, and the loss of potassium has increased year by year. As the input of nitrogen and phosphorus has increased, the crop output has increased substantially, and the demand for potassium by crops has increased.
2. Continuous breeding for many years destroyed the balance of potassium in the ecosystem
Because of its nitrogen fixation, the broad bean can also obtain the harvest under the conditions of coarse or coarse tube. The masses are accustomed to planting broad beans year after year for fields with good soil fertility and ploughing fields for planting wheat and rapeseed, poor fertility and poor cultivation. In some areas of my county, there are even a few plots of 30 to 40 years of broad bean varieties. Years of continuous cropping not only benefit the occurrence of pests and diseases of broad bean, but also destroy the ecological balance of farmland. In the soil ecology, the one-way flow of potassium is formed, resulting in a decrease in soil potassium content. Therefore, the longer the duration of continuous bean production, the more contradictory the lack of potassium in the soil.
3. Ion antagonism
According to the study of ion antagonism between K+ and NH4+, K+ is 5.32 and NH4+ is 5.37 from the ion hydration radius. They are the same binding site on the carrier and inhibit each other. The presence of a large amount of NH4+ inhibits K+ ions. As a result, the high nitrogen content in the soil is also an important cause of the shortage of potassium in the soil. According to the test, the incidence index of potassium deficiency in broad bean increases with the increase of nitrogen application level in the diseased field, the yield of broad bean and the plant body Potassium content decreased step by step.
4. The imbalance of N, P and K in soil resulted in high N/K ratio
According to the analysis of the soil samples in the affected field, the ratio of N/K of different soil types in the diseased field is different, and the gap is larger. The N/K ratio of the soil caused a change in the N/K ratio of the plant. The dominant determinant of the ratio of soil available nitrogen and potassium ratio is the content of soil available potassium; followed by the content of available nitrogen, when the content of available nitrogen is basically similar, the increase of nitrogen and potassium ratio mainly depends on potassium, which is to prevent potassium deficiency. The occurrence of symptoms provides a basis for potassium application.
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