1. Insufficient potassium investment
Insufficient potassium supply in soil is the main cause of potassium deficiency in broad beans. Potassium nutrients mainly rely on organic fertilizer. In recent years, the proportion of organic fertilizer has been declining, and the loss of potassium has increased year by year. As the input of nitrogen and phosphorus continues to increase, crop yields have increased substantially, and the demand for potassium in crops has increased.
2. Years of continuous cultivation, destroying the balance of potassium in the ecosystem
Due to its own nitrogen fixation, broad beans can also be harvested under conditions of coarse or coarse crude tubes. The masses are accustomed to planting wheat and rapeseed with good soil fertility performance and good ploughing, and planting broad beans every year in fields with poor fertility and poor ploughing. In some areas of our county, there are even 30 to 40 years of continuous fields of broad beans. Years of continuous cropping not only benefit the occurrence of faba bean pests and diseases, 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 the potassium content of the soil. Therefore, the longer the continuous operation of broad bean, the more prominent the contradiction of potassium deficiency in the soil.
3. Ion antagonism
According to the study, there is ion antagonism between K+ and NH4+. From the ion hydration radius, K+ is 5.32 and NH4+ is 5.37. They are the same binding sites on the carrier and inhibit each other. The presence of NH4+ ions inhibits K+ ions. Absorption, so the high nitrogen content in the soil is also an important cause of insufficient potassium supply in the soil. According to the test, in the diseased field, with the increase of nitrogen application rate, the incidence index of potassium deficiency in broad bean increased, the yield of broad bean and the body of the plant The potassium content decreased in steps.
4. The imbalance of N, P and K ratio in soil leads to high N/K ratio of plants.
According to the soil sample analysis of the affected fields, the N/K ratios of different soil types are different in the affected fields, and the gap is large. The N/K ratio of the soil caused a change in the N/K ratio of the plant. The dominant factor of soil available nitrogen-potassium ratio imbalance is the content of soil available potassium; followed by the content of available nitrogen. When the content of available nitrogen is similar, the increase of nitrogen-potassium ratio depends mainly on potassium, which is to prevent and control potassium deficiency. The occurrence of symptoms provides a basis for potassium application.
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