Increase the effect of planting density on the amount of potassium needed. 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 the application of potassium fertilizer 5-6 kg/mu, the yield did not decrease, but increased, especially in the corn plot 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.
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, more nitrogen is applied, thereby increasing the infection rate of plants against pests and diseases such as stem rot, root rot, and bacterial wilt. 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.
Field potassium deficiency diagnosis and top dressing remedial measures: The spring maize entering the jointing stage, from the small bell mouth to the big bellmouth fertility period is its rapid growth period, the demand for nitrogen, phosphorus and potassium elements have increased, usually used in actual production Only topdressing nitrogen fertilizer without paying attention to topdressing potassium fertilizer. However, in the high-yielding and close-growing cultivation of spring maize, it is not necessary to top-dress. If you observe the plant growth status, you can get an answer. That is, often at 90:00 in the morning to go to the cornfield to see, especially the windy weather is more to see, if you see the spring corn leaves in the morning to fight, it is the lack of 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 potassium chloride 5 to 8 kg/mu. After applying the ditch or hole, cover the soil.
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