Most of the soils in North China were originally rich in available potassium, and since the past 30 years only used no supplements or supplements, the available potassium content in soil decreased year by year. Cotton is also a crop sensitive to potassium. Especially since the development of BT transgenic cotton, potassium-deficient cotton fields often exhibit severe disease, premature aging, small bells, poor boll opening, and poor fiber quality. Five years ago, the results of fast-track nutrient measurements of soils in the cotton fields of central-southern South China indicate that most of the soil available potassium is less than 8 parts per million, which is a severe shortage of potassium, and some soils are less than 40 parts per million, reaching extreme potassium deficiency. Degree. The soil nutrient tester test data is not accurate, and some soil samples have a measured available potassium content of 0. Many test points have experienced this phenomenon, which shows that the degree of potassium deficiency is serious.
Due to the advocacy and practice of potash fertilizer application, the increase in the use of potash fertilizers containing high-potassium cotton fertilizers has increased the number of cotton farmers year by year, all of which have played a role in controlling disease and increasing yield, and the content of available potassium in soil has also been revived, but there are also cotton farmers. Understand ambiguously that potassium contained in multiplex fertilizer (with a ratio of nitrogen, phosphorus, and potassium of 1:1:1) can be used instead of potassium fertilizer, or replaced with high-concentration compound fertilizer containing 19% nitrogen, phosphorus, and potassium. More potassium fertilizer, and some cotton farmers mistakenly believe that "potassium sulfate compound fertilizer" is potash fertilizer, the result is no less money but not play a role in potassium.
The northern part of the country has seen more rain and cold temperatures in recent days. Some farmers believe that some cotton plants have yellow leaves after they become yellow, and they have even begun to die, and some people think that it is an outbreak of yellow wilt. The most important basis for judging whether it is withering is wilt disease. As long as the xylem of the cotton stalk does not turn brown, it can eliminate the brown wilt disease, which may be caused by extreme potassium deficiency (K deficiency may also induce disease and aggravate the disease). The low-lying areas, over-watered areas, and heavily-clumped cotton trees perform severely. Even the worst cotton fields in the whole field are prematurely dying and dying. I have seen such cotton fields every year; the cotton fields that use potash fertilizer will not grow late. Cause a lot of dead trees.
Why is there a lot of dead corn in corn fields? Because corn is a crop that requires more potassium and strong potassium absorption capacity, if there is not much potassium in the corn field and the corn yield is high, the available potassium in the soil is almost consumed by the corn, and if potassium fertilizer is not added after the cotton is changed, the same applies. Will cause a lot of dead trees.
The cotton plants began to show more potassium deficiency from the lower part of the old leaves in early August. Under heavy rains, more cottonseeds were formed. At this time, even three sprays of potassium fertilizer will not be made or a large number of dead trees will be formed later. As of mid-August, if some of the cotton plants showed a lack of potassium, but there are still green leaves on the upper part, and then they will pay close attention to reducing potassium, which will also reduce losses. If the upper leaves of the cotton plants are already yellow, most cotton plants have decayed and it is too late to add potassium.
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