Increased production requires increased potassium. As the level of maize production increases, the supply of available soil potassium will increase correspondingly during the key growth period. The results of many long-term maize trials showed that when the production increased by 10% to 20%, there was a corresponding increase in potassium uptake. Appropriate increase in the potassium content of corn tissue can maintain a stable high yield. In the spring maize field in northern China, although the content of available potassium in soil is at a relatively high level (eg, 70-130 mg/kg), the application of potash fertilizer still has an effect of increasing yield. In particular, some soils with a moderately available potassium content and a low-potassium capacity have to be considered for increasing potash fertilizer in high yield fields. Therefore, when using yield targets as the main basis for the recommended potassium application, it is necessary to pay attention to increasing potassium fertilizer in soil with low effective potassium content as a necessary measure to ensure high yield, and also to note that some soil available potassium levels even if moderate, increase the appropriate amount Potash also has good results.

Increased planting density requires increased potassium. In the current high-yielding hybrid corn cultivation, the yield is greatly increased by increasing the density, and at the same time, the potassium uptake by the high-density plants to the farmland is also significantly increased. Therefore, when the density increases, if the potassium fertilizer is not applied accordingly or the potency of the soil potassium is increased, it is difficult to ensure that the crop is absorbing potassium, and the yield may drop or reach an ideal level. However, after increasing potassium fertilization by 5 to 6 kg/mu, the yield did not drop but increased. Especially in the corn plots with low effective potassium content and irrigation conditions. Therefore, in order to adapt to higher density and yield levels when applying corn fertilization, the amount of potassium applied should be increased more than the conventional amount.

Nitrogen and potassium balance, the need for potassium increased. In dense planting of high-yield corn, it is critical to coordinate the balanced supply of potash and nitrogen fertilizers. Under normal circumstances, in order to achieve high-yield targets and more nitrogen, thereby increasing the plant pests and diseases such as stem rot, root rot, bacterial wilt and other infection rates. If there is no corresponding increase in potash supply, symptoms of nitrogen and potassium imbalances can develop. The lack of potassium first weakened the corn's stems and leaves' flexural strength and epidermis thickness, which increased the possibility of lodging and increased the corn's sensitivity to insect pests and diseases. It is well known that nitrogen and potassium in nutrient elements have a large impact on the disease resistance of maize, but the direction of action of the two is different. Nitrogen is more likely to increase the sensitivity of corn to diseases, while the role of potassium is the opposite and can increase crops. The disease resistance.

So, how to diagnose potassium deficiency in the field? How to reduce potassium potassium?

When spring maize enters the jointing stage, the fertility period from the small bell mouth to the big bell mouth is its period of rapid growth, and the demand for N, P, and K elements has increased. Usually in actual production, we are accustomed to topdressing nitrogen fertilizers without paying attention to topdressing potassium fertilizers. However, in high-yield and close-growing cultivation of spring maize, it is not necessary to top-dress. If you ask the corn growing in the field to observe the plant growth status, you may get Reply. That is, often at 90:00 in the morning to go to the cornfield to see, especially windy weather is even more to see, if you see the spring corn leaves in the morning to fight, then it is to tell you "I lack potassium". For normal and irrigated farmland, normal and robust corn plants do not have leaf snoring in the morning, and it is normal to have snoring after noon. Because potassium can affect leaf stomatal closure and increase plant water retention. In the absence of potassium, the stomatal resistance is large and cannot be closed properly, resulting in severe water loss in the corn and snoring. At this time, topdressing potassium must be used to remedy the situation. The most feasible measure is to chase 5-8 kg of potassium chloride. After the application of the ditch or hole, the soil can be reused.

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