As the level of corn production increases, the critical growth period requires a corresponding increase in the availability of available potassium. The results of many long-term maize positioning tests have shown that when the yield is increased by 10% to 20%, the amount of potassium absorbed also increases accordingly. Appropriately increase the potassium content of corn plant tissue to maintain stable high yield. In the spring sowing corn area in the north, although the soil available potassium content is at a relatively high level (such as 70-130 mg / kg), the application of potassium fertilizer still has an effect of increasing yield. In particular, some soils with medium available potassium content and low-potential potassium capacity should consider increasing potassium fertilizer in high-yield fields. Therefore, when the production target is used as the main basis for recommending potassium application, the application of potassium fertilizer to soil with low effective potassium content is a necessary measure to ensure high yield. Also note that some soils with moderate potassium levels have moderate effects when applied with moderate amounts of potash.
Increase the impact of planting density on the amount of potassium required. At present, high-yield hybrid corn cultivation often increases the yield by increasing the density, and at the same time, the potassium absorption of the high-density plants on the farmland is also significantly improved. Therefore, when the density is increased, if the potassium fertilizer is not increased or the soil potassium is increased, the crop is difficult to be guaranteed due to potassium absorption, and the yield may fall or fall short of the desired level. However, after the application of potassium fertilizer 5-6 kg/mu, the yield will not decrease but will increase. Especially in corn plots where the effective potassium content is not high and there are irrigation conditions. Therefore, in the case of recommended fertilization for corn, in order to adapt to higher density and yield levels, the amount of potassium applied is appropriately increased than the conventional amount.
It is critical to coordinate the balanced supply of potash and nitrogen fertilizers in densely planted high-yield maize cultivation. In general, more nitrogen is applied to achieve high yield targets, thereby increasing the infection rate of plants such as stem rot, root rot, and bacterial wilt. If the potassium supply is not increased correspondingly, symptoms of nitrogen and potassium imbalance will form. Potassium deficiency first weakened the flexural strength and epidermal thickness of corn stems and leaves, which increased the possibility of lodging and increased the sensitivity of corn to insects and diseases. It is well known that nitrogen and potassium have a great influence on the disease resistance of maize in nutrient elements, but the direction of action of the two is different. Nitrogen tends to increase the sensitivity of corn to disease, while the effect of potassium can increase the crop. Disease resistance.
Potassium deficiency diagnosis and topdressing remedy in the field. When the spring corn enters the jointing stage, the growth period from the small bell mouth to the big bell mouth is its rapid growth period, and the demand for nitrogen, phosphorus and potassium elements has increased. Usually, in actual production, it is accustomed to only apply nitrogen fertilizer without paying attention to chasing. Apply potassium fertilizer. However, in the high-yield and dense-planting cultivation of spring corn, it is necessary to do not need topdressing. Just look at the corn grown in the field and observe the growth of the plant, you can get an answer. That is, I often go to the cornfield at 90 o'clock in the morning. Especially the windy weather depends on the wind. If you see the leaves of spring corn snoring in the morning, then it is telling you "I am short of potassium." . Because for the farmland that is not urgently needed for irrigation, the normal and robust corn plants will not have leaf snoring in the morning, and it is normal to have snoring after noon. Because potassium can affect the closure of leaf stomata and increase plant water retention. In the absence of potassium, the stomatal resistance is large and cannot be closed normally, resulting in serious water loss in the corn body and snoring. At this time, it is necessary to apply potassium fertilizer for remediation. The most feasible measure is to apply 5 to 8 kg of potassium chloride. After ditch application or acupoint application, the soil can be covered.
Peasant Daily (Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping)
Increase the impact of planting density on the amount of potassium required. At present, high-yield hybrid corn cultivation often increases the yield by increasing the density, and at the same time, the potassium absorption of the high-density plants on the farmland is also significantly improved. Therefore, when the density is increased, if the potassium fertilizer is not increased or the soil potassium is increased, the crop is difficult to be guaranteed due to potassium absorption, and the yield may fall or fall short of the desired level. However, after the application of potassium fertilizer 5-6 kg/mu, the yield will not decrease but will increase. Especially in corn plots where the effective potassium content is not high and there are irrigation conditions. Therefore, in the case of recommended fertilization for corn, in order to adapt to higher density and yield levels, the amount of potassium applied is appropriately increased than the conventional amount.
It is critical to coordinate the balanced supply of potash and nitrogen fertilizers in densely planted high-yield maize cultivation. In general, more nitrogen is applied to achieve high yield targets, thereby increasing the infection rate of plants such as stem rot, root rot, and bacterial wilt. If the potassium supply is not increased correspondingly, symptoms of nitrogen and potassium imbalance will form. Potassium deficiency first weakened the flexural strength and epidermal thickness of corn stems and leaves, which increased the possibility of lodging and increased the sensitivity of corn to insects and diseases. It is well known that nitrogen and potassium have a great influence on the disease resistance of maize in nutrient elements, but the direction of action of the two is different. Nitrogen tends to increase the sensitivity of corn to disease, while the effect of potassium can increase the crop. Disease resistance.
Potassium deficiency diagnosis and topdressing remedy in the field. When the spring corn enters the jointing stage, the growth period from the small bell mouth to the big bell mouth is its rapid growth period, and the demand for nitrogen, phosphorus and potassium elements has increased. Usually, in actual production, it is accustomed to only apply nitrogen fertilizer without paying attention to chasing. Apply potassium fertilizer. However, in the high-yield and dense-planting cultivation of spring corn, it is necessary to do not need topdressing. Just look at the corn grown in the field and observe the growth of the plant, you can get an answer. That is, I often go to the cornfield at 90 o'clock in the morning. Especially the windy weather depends on the wind. If you see the leaves of spring corn snoring in the morning, then it is telling you "I am short of potassium." . Because for the farmland that is not urgently needed for irrigation, the normal and robust corn plants will not have leaf snoring in the morning, and it is normal to have snoring after noon. Because potassium can affect the closure of leaf stomata and increase plant water retention. In the absence of potassium, the stomatal resistance is large and cannot be closed normally, resulting in serious water loss in the corn body and snoring. At this time, it is necessary to apply potassium fertilizer for remediation. The most feasible measure is to apply 5 to 8 kg of potassium chloride. After ditch application or acupoint application, the soil can be covered.
Peasant Daily (Senior Consultant of Sinofert, Professor of China Agricultural University, Cao Yiping)
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Diaphragm Pump,Air Operated Diaphragm Pump,Air Diaphragm Pump,Double Diaphragm Pump
Hengshui Yuanhan Trading Co.,Ltd , https://www.yuanhanpump.com