Zhang Youhai, a grain grower in Zhangzhou, Hebei Province, planted 10 mu of spring corn, where the soil is light loam, slightly sandy, and the night tide. The soil fertility of the farmland is of medium and high quality, and the annual corn production is also over a thousand pounds. Before sowing corn this year, 10 kg of diammonium and 10 kg of urea were used as base fertilizer. After spreading the fertilizer on the ground, use a rotary plough to turn the soil so that the fertilizer is mixed in a 12-cm deep soil layer. At that time, the soil had a good sensation and the maize seedlings emerged neatly and quickly. However, after entering late June, as the temperature rises, the upper central blade of the corn plant appears snoring, but the plot does not lack water, because when the corn seedlings are in the small bell mouth, they do not dare to flood the seedlings until the big horn. When the mouth began to irrigation and top dressing. On a windy day, the leaves snored in the early morning and there was a fight at 10 a.m. on a windy day.
Expert analysis: The strange phenomenon demonstrated in this case is that the soil in the corn field is not short of water, but corn seedlings can start to fight early. This is obviously not the cause of drought. The general rule is that in the summer high temperature season, corn plants have high leaf area and strong transpiration under the condition that the soil moisture is not very good. Generally, it is easy to fight in the midday or 1 or 2 o'clock in the afternoon, and the sun goes down in the evening. Afterwards, the temperature decreases and the transpiration diminishes. The leaves of the plants will gradually recover. The situation here is rather abnormal. Corn has just been poured into water and the soil is night tide soil. Since plant snoring is not caused by drought, it is only because of what causes physiological drought. First of all, we must take a look at the situation of fertilization. The basal fertilizer for corn is applied only with urea and ammonium phosphate and no potassium fertilizer. The corn is a crop in which the potassium needs more potassium, and the large amount of nitrogen and phosphorus do not make up potassium, which may cause potassium deficiency. In addition, the soil in the local block is partial to sand and belongs to alluvial farmland. The content of total potassium and available potassium is not high. With these two reasons, the agricultural technicians believe that premature snoring of corn is caused by potassium deficiency. Symptoms, so he advised farmers to immediately apply 15 kg of potassium chloride. This decision is reasonable. As for the application of potassium fertilizer, it will not cure the disease until it is proved by practice.
The reason why potassium deficiency causes smashing of corn leaves is to talk about the physiological function of potassium. The accumulation of sufficient potassium in the roots and in the body of corn, the resulting osmotic gradient can enhance the absorption of water by roots; at the same time, potassium is protected in the stomata of the leaves. Enrichment in cells can regulate stomatal opening and closing, regulate the transpiration of water, prevent excessive loss of water in the body, thereby enhancing the drought resistance of the crop. This is the intrinsic reason why potash fertilizers in arid years are better than normal years.
Thus, it should be noted that the use of potash should be paid attention to when it comes to sandy soil or when planting potassium-rich crops. When planting food crops in most of the soils in the northern regions, it is not necessarily a symptom of potassium deficiency because most of the northern soils have stronger potassium supply than the southern acid soils. For food crops in the north, whether potassium should be applied annually or not should be considered comprehensively in consideration of crop types, yield levels, soil potassium supply, and the history of fertilization, such as the application of organic fertilizer and straw return. This case is rather typical. In the production of food crops in the north, limited potassium fertilizer resources should be used.
In the application method of potash fertilizer, generally 4 to 5 kg of potassium is used as a base fertilizer for deep application to the soil, or top dressing is performed together with urea during the corn jointing period.
Expert analysis: The strange phenomenon demonstrated in this case is that the soil in the corn field is not short of water, but corn seedlings can start to fight early. This is obviously not the cause of drought. The general rule is that in the summer high temperature season, corn plants have high leaf area and strong transpiration under the condition that the soil moisture is not very good. Generally, it is easy to fight in the midday or 1 or 2 o'clock in the afternoon, and the sun goes down in the evening. Afterwards, the temperature decreases and the transpiration diminishes. The leaves of the plants will gradually recover. The situation here is rather abnormal. Corn has just been poured into water and the soil is night tide soil. Since plant snoring is not caused by drought, it is only because of what causes physiological drought. First of all, we must take a look at the situation of fertilization. The basal fertilizer for corn is applied only with urea and ammonium phosphate and no potassium fertilizer. The corn is a crop in which the potassium needs more potassium, and the large amount of nitrogen and phosphorus do not make up potassium, which may cause potassium deficiency. In addition, the soil in the local block is partial to sand and belongs to alluvial farmland. The content of total potassium and available potassium is not high. With these two reasons, the agricultural technicians believe that premature snoring of corn is caused by potassium deficiency. Symptoms, so he advised farmers to immediately apply 15 kg of potassium chloride. This decision is reasonable. As for the application of potassium fertilizer, it will not cure the disease until it is proved by practice.
The reason why potassium deficiency causes smashing of corn leaves is to talk about the physiological function of potassium. The accumulation of sufficient potassium in the roots and in the body of corn, the resulting osmotic gradient can enhance the absorption of water by roots; at the same time, potassium is protected in the stomata of the leaves. Enrichment in cells can regulate stomatal opening and closing, regulate the transpiration of water, prevent excessive loss of water in the body, thereby enhancing the drought resistance of the crop. This is the intrinsic reason why potash fertilizers in arid years are better than normal years.
Thus, it should be noted that the use of potash should be paid attention to when it comes to sandy soil or when planting potassium-rich crops. When planting food crops in most of the soils in the northern regions, it is not necessarily a symptom of potassium deficiency because most of the northern soils have stronger potassium supply than the southern acid soils. For food crops in the north, whether potassium should be applied annually or not should be considered comprehensively in consideration of crop types, yield levels, soil potassium supply, and the history of fertilization, such as the application of organic fertilizer and straw return. This case is rather typical. In the production of food crops in the north, limited potassium fertilizer resources should be used.
In the application method of potash fertilizer, generally 4 to 5 kg of potassium is used as a base fertilizer for deep application to the soil, or top dressing is performed together with urea during the corn jointing period.
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