First, prevent premature aging
Premature senescence of maize refers to the late stage of corn growth, that is, the filling stage. The leaves below the ear of corn are yellow, the stems are dry, the photosynthesis ability is lost prematurely, and even the lodging is reversed. As a result, the corn kernels are empty and the 100-grain weight is reduced, causing serious damage. Reduce production. During the growth of corn, it will inevitably consume a lot of nutrients and water, and too much water in the growth will cause the soil to be deprived of oxygen. At this time, the root activity is weakened and the water absorption is difficult, but the leaf transpiration is not reduced, especially the eye, the leaves consume more water. It is easy to cause physiological metabolic disorders, and the leaves are curled and grow slowly. If the fertilizer is lacking at this time, the plants will be short and even withered. Control method: If there is rainy area, it should be done to prevent and stain the sputum; if there is a trend of premature aging or leaf tribute, spray the phosphate fertilizer at the beginning of flowering to extend the green period of the leaf and increase the weight of the ear.
Second, anti-air stalk
Empty stalk refers to the phenomenon that corn has no ears or has no granules. If the corn plant lacks mineral nutrition, it can not meet the nutrient requirements during the ear differentiation stage, or the planting density is too large, the photosynthesis is weak, and the nitrogen fertilizer, the phosphate fertilizer and the potassium deficiency will cause empty stalks. Control method: Pay attention to the density when planting, and require large rows of corn not to be sealed to ensure the plant is ventilated; supply nutrients and water in appropriate amount at appropriate time to facilitate the differentiation and development of the ear; pay attention to the proper combination of nitrogen, phosphorus and potassium in fertilization. .
Third, prevent granules and baldness
Baldness refers to the phenomenon that the top of the corn ear harvested in autumn is not strong. In the soil, there is a lack of phosphate fertilizer. If the sugar plant is in the flowering stage of the booting stage, if the sugar metabolism and egg protein synthesis and cell division are blocked, the top of the ear will shrink, the filament elongation will slow down, affecting pollination, which will lead to baldness and even empty ear; soil such as potassium deficiency Soluble carbohydrates are hindered from transporting to the granules, and the starch is less in the grain; or the insects and wind damage in the early stage cause the seedlings to transport insufficient nutrients; or the rain during the flowering period can cause baldness, mites or empty grains. Prevention and treatment methods: to prevent premature aging of plants, prevent pests and diseases; apply more phosphorus and potassium fertilizers; if drought occurs during spinning, it should be watered in time; artificial pollination is best during flowering.
Fourth, anti fall
The density of the seedlings is too large, and the fertilizer and water are not properly managed when the stems are elongated, which is likely to cause lodging and affect the yield. Control methods: When planting, deepen the tillage layer and increase the application of base fertilizer; when cultivating, properly cultivate the soil to make the corn stabilize the root frame; pay attention to the combination of nitrogen, phosphorus and potassium when fertilizing, and pay attention to the plant density should not be too large, to ensure that the leaves in the growing season have Sufficient sunlight makes the plants thicker to increase the lodging resistance.
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