Causes and solutions of potassium deficiency in broad bean

Broad bean is a common legume crop, named because it is shaped like silkworms, has good edible and medicinal value, and is a crop for both feed and green manure. Potassium is one of the necessary nutrient elements in the whole growth process of broad bean. In the later growth stage, the lack of potassium will lead to the decrease of yield and quality. So what is the reason for potassium deficiency in broad beans? Let's take a look.

1. Insufficient application of potash fertilizer

The lack of potassium in soil, resulting in insufficient supply of potassium, is the main reason for potassium deficiency of broad bean. Potassium in soil is mainly through the application of organic fertilizer or potassium fertilizer. With the less and less application of organic fertilizer, the potassium in the soil decreases gradually, while the application of a large number of chemical fertilizers leads to the continuous increase of nitrogen and phosphorus in the soil, which makes the crops grow rapidly, and the demand for potassium fertilizer is also increasing relatively.

Solution: organic fertilizer or organic fertilizer is recommended when applying base fertilizer, nitrogen, phosphorus and potassium fertilizer should be matched reasonably when topdressing, and the proportion of potash fertilizer should be increased.

2. Continuous cropping for many years

Continuous cropping for many years is one of the reasons for the lack of potassium in broad bean. Broad bean has excellent nitrogen fixation, so both coarse seeds and coarse tubes can obtain extremely high yield, so farmers often see that plots with poor soil fertility are used to grow broad beans, while plots with good soil conditions are often used to grow wheat, sorghum and other crops. Under this planting mode, the frequency and degree of diseases and insect pests become more and more serious, seriously destroying the ecological balance, resulting in the loss of potassium in the soil, the content of potassium continues to decline, resulting in potassium deficiency, and the longer the continuous cropping time, the more prominent the contradiction of potassium deficiency.

Solution: reasonable rotation, reduce the severity of diseases and insect pests, prevent the loss of soil potassium, and achieve balanced ecological development.

3. Too much nitrogen

Nitrogen and potassium are mainly resistant to ions, they will inhibit each other on the same carrier, and the ions of nitrogen will inhibit the absorption of potassium. Therefore, when there is more nitrogen in the soil, it is also one of the reasons for broad bean potassium deficiency. According to practical production, with the greater the amount of nitrogen fertilizer, the incidence index of plant potassium deficiency increases.

The solution: whether or not to apply nitrogen fertilizer alone, the essential elements for plant growth in the early stage of nitrogen fertilizer will lead to excessive growth and premature senescence in the middle and later stage, so it is necessary to reduce the use of nitrogen fertilizer and increase the application of phosphorus and potassium fertilizer in the middle and later stage. it can improve plant disease resistance and achieve the purpose of increasing production.

4. Imbalance of nitrogen, phosphorus and potassium in soil.

The imbalance of N, P and K ratio in soil will lead to higher N / K ratio of plants. Soil sampling analysis of diseased fields shows that the difference of N / K ratio in soil is different, and the change of N / K ratio in soil will lead to the change of N / K ratio of plants. The main factor of soil available N / K ratio imbalance is the content of soil available K. when the content of available N is similar, the increase of N / K ratio mainly depends on potassium.

Solution: reasonable adjustment of the proportion of soil nitrogen, phosphorus and potassium, fertilization must be a reasonable combination, should not be partial application.

The above are the causes and solutions of broad bean potassium deficiency. I hope I can help you. If you want to know more about broad bean planting, please pay attention to us.