Maize is a crop that requires a large amount of potassium in production and is sensitive to potassium fertilizer. Rational application of potash is a necessary measure for high yield of corn. Some plots, due to the complexity of the field, are easily overlooked when the symptoms are mild, and may be misdiagnosed as a drought when the symptoms are severe. In order to facilitate observation and identification of potassium deficiency symptoms in the field, the following will describe the apparent identification of several potassium deficiency disorders according to the progress of the maize growth period:
1. The seedling color and growth rate are mainly observed in the seedling stage. When the soil potassium concentration is insufficient and the potassium concentration in the body is not high, not only the growth rate of the seedlings is slowed down, but also the area of ​​the corn leaves becomes smaller, and the leaf color will appear dark green or blue-green, which is due to the shortage of potassium to reduce the volume of the leaf tissue cells. The reason for the increase in chlorophyll density.
2. When the windy day is observed in the cornfield, you can see that some of the plots are tall and straight, and some of the plots are obviously listless. The leaves start to smash at 9 o'clock in the morning. Why do the same weather show signs of wilting? In fact, it is a typical symptom of potassium deficiency in corn! It indicates that the soil in these plots is insufficient for potassium supply, especially the soil is not strong enough. This physiological role of potassium is not replaced by nitrogen and phosphorus.
3. After the corn enters the rapid growth stage, the symptoms of potassium deficiency are mainly brown spots on the leaves, and the leaves are scorched in severe cases. From the whole plant, firstly, chlorosis and necrosis appear in the old leaves. When the old leaves mature, the symptoms of potassium deficiency will develop to the middle leaves, and the leaves and edges of the mature leaves will chlorotic, first spotted, then Connected into pieces. When the degree of potassium deficiency continues to increase, there are necrotic spots at the tip of the leaf and the edge of the leaf. The leaf edge is dry and burnt, and the farmers call it "focal edge", which is a typical symptom of potassium deficiency.
4. The change of stems of potassium-deficient plants is that the internodes become shorter and the stems become thinner and softer. The reason is that the activity of the formation layer is reduced, and the lignification of the vascular bundle is weakened, which is why the lack of potassium causes the corn plants to easily fall.
When it was found that farmland corn had potassium deficiency symptoms, its consequences not only directly affected the yield, but also made the corn susceptible to infection and quality decline. To this end, it is necessary to take remedial measures in a timely manner. The easiest way is to apply potassium fertilizer and carry out late potassium supplementation measures. In the corn big bell period or later, the plant height is shaped, the silk is started, and the potassium fertilizer is applied, and 4 to 8 kg of potassium chloride is applied per acre. The application method may be applied by a hole application or a strip, and combined with watering.
1. The seedling color and growth rate are mainly observed in the seedling stage. When the soil potassium concentration is insufficient and the potassium concentration in the body is not high, not only the growth rate of the seedlings is slowed down, but also the area of ​​the corn leaves becomes smaller, and the leaf color will appear dark green or blue-green, which is due to the shortage of potassium to reduce the volume of the leaf tissue cells. The reason for the increase in chlorophyll density.
2. When the windy day is observed in the cornfield, you can see that some of the plots are tall and straight, and some of the plots are obviously listless. The leaves start to smash at 9 o'clock in the morning. Why do the same weather show signs of wilting? In fact, it is a typical symptom of potassium deficiency in corn! It indicates that the soil in these plots is insufficient for potassium supply, especially the soil is not strong enough. This physiological role of potassium is not replaced by nitrogen and phosphorus.
3. After the corn enters the rapid growth stage, the symptoms of potassium deficiency are mainly brown spots on the leaves, and the leaves are scorched in severe cases. From the whole plant, firstly, chlorosis and necrosis appear in the old leaves. When the old leaves mature, the symptoms of potassium deficiency will develop to the middle leaves, and the leaves and edges of the mature leaves will chlorotic, first spotted, then Connected into pieces. When the degree of potassium deficiency continues to increase, there are necrotic spots at the tip of the leaf and the edge of the leaf. The leaf edge is dry and burnt, and the farmers call it "focal edge", which is a typical symptom of potassium deficiency.
4. The change of stems of potassium-deficient plants is that the internodes become shorter and the stems become thinner and softer. The reason is that the activity of the formation layer is reduced, and the lignification of the vascular bundle is weakened, which is why the lack of potassium causes the corn plants to easily fall.
When it was found that farmland corn had potassium deficiency symptoms, its consequences not only directly affected the yield, but also made the corn susceptible to infection and quality decline. To this end, it is necessary to take remedial measures in a timely manner. The easiest way is to apply potassium fertilizer and carry out late potassium supplementation measures. In the corn big bell period or later, the plant height is shaped, the silk is started, and the potassium fertilizer is applied, and 4 to 8 kg of potassium chloride is applied per acre. The application method may be applied by a hole application or a strip, and combined with watering.
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