Extremely potassium-deficient cotton fields will kill a lot of dead trees

Most of the soil in North China was originally rich in available potassium. Since it has not been supplemented or supplemented in the past 30 years, the soil available potassium content has decreased year by year. Cotton is also a potassium-sensitive crop. Especially after the development of BT transgenic cotton, potassium-deficient cotton fields often show serious diseases, premature aging, small bells and bells, poor bolls and poor fiber quality. Five years ago, the quick-acting nutrient rapid test results for the soil in the central and southern cotton fields showed that most of the soil available potassium was less than 80 parts per million, which was a serious potassium deficiency, and some soils were less than 40 parts per million, reaching extreme potassium deficiency. Degree. The soil nutrient rapid tester test data is not accurate. Some soil samples have a quick-acting potassium content of 0. Many test sites have experienced this situation, and the degree of potassium deficiency is serious.

Due to the advocacy and practice of increasing potassium fertilizer, the cotton farmers who apply potassium fertilizer with high potassium content have increased year by year, which has played a role in disease control and yield increase. The available potassium content in the soil has also been restored, but there are also farmers. Fuzzy understanding, that the reuse of fertilizer (most of the ratio of nitrogen, phosphorus, potassium: 1:1:1) can be used instead of potassium, or with high-concentration compound fertilizer containing 19% of nitrogen, phosphorus and potassium. More potassium fertilizer, and some cotton farmers mistakenly believe that "potassium sulfate compound fertilizer" is potassium fertilizer, the result is no less money but no potassium.

Recently, there have been more rainy and cloudy weather in the north. Some cotton farmers have reported that some cotton fields in the cotton field are yellow and then dry, and even begin to die, and some believe that it is an outbreak of Verticillium wilt. The most important basis for judging whether or not buckwheat is the stalk is that as long as the xylem of the cotton stalk does not turn brown, the blight is eliminated, which is most likely caused by extreme potassium deficiency (potassium deficiency can also cause disease and aggravate the condition) The low-lying area, the place where the water is accumulated, the cotton tree with many peaches is serious, and the most serious even the whole cotton plant is prematurely dying. I have seen such cotton fields every year; Caused a lot of dead trees.

Why do some cotton stalks of corn mash have a lot of dead trees? Because corn is a crop that requires more potassium and absorbs potassium. If the corn field contains less potassium and the corn yield is high, the available potassium in the soil is almost exhausted by the corn. If the potassium is not added after the cotton is replanted, the same Will cause a lot of dead trees.

The cotton plant began to show potassium deficiency. It started from the lower part of the old leaves in early August. It was raining heavily, and more cotton peaches were formed. At this time, even if the potassium fertilizer was sprayed three times, it would not be made or a large number of dead trees later. By mid-August, some cotton plants showed potassium deficiency, but there were green leaves in the upper part, and then they could increase potassium and reduce losses. If the upper leaves of the cotton plant are already yellow, most of the cotton plants have already withered, and it is too late to add potassium.

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November 11, 2018