First, prevent premature aging
Because corn plants are tall, they must consume a lot of nutrients and water during growth. From earing to milk ripening stage is the critical period of corn growing and fertilizer. Adequate water and fertilizer conditions are the key factors that determine the high yield of corn. If the lack of water and lack of fertilizer at this time, it is bound to cause premature aging in the middle and late. Therefore, to reapply jointing fertilizer, panicle fertilizer, for premature aging plots, should be divided in the pistil florets to the grain formation period, and then apply 20 kg of urea per acre. However, if there is too much water during the growth period, the soil will suffer from hypoxia. At this time, the root activity will be weakened and the water absorption will be difficult. However, the transpiration of the leaves will not diminish. In particular, on sunny days, the leaves will consume more water, which will easily lead to physiological metabolic disorders and leaf curling. Slow growth. Therefore, in rainy areas, drainage and anti-spotting work should be done to enhance root vitality.
The second is the air defense rod
Insufficient supply of minerals and malnutrition cannot meet the requirements for nutrients during ear differentiation, or the density is too large and the photosynthetic intensity is weak. However, many nitrogen fertilizers, low phosphorus, and potassium deficiency can cause empty rods. Prevention methods are: When planting, attention should be paid to the density, which requires Daehang corn not to be sealed, in order to ensure the ventilation and ventilation of the plant, timely and appropriate supply of nutrients and moisture, in order to facilitate ear differentiation and development. At the same time, attention should be paid to the reasonable ratio of nitrogen, phosphorus and potassium during fertilization so that long roots and strong stems can be used for top-fertilization. Seedlings should be properly recharged before and after heading. If too dense or weak strain should be unplugged in time.
The third is to prevent grain and baldness
Early defertilization, premature aging of middle and late stages of maize growth in the middle and late stages, poor male and female ear development, affecting pollination; lack of phosphate in soil, plant in the booting anthesis, such as sugar metabolism and protein synthesis, cell division blocked, the top of the ear will shrink The elongation of filaments also slows down, affecting natural pollination, which can lead to bald heads or even empty ears; during filling stage, if the soil is low in potassium, soluble carbohydrates are prevented from being transported to the grain, and the grain starch is also necessarily less. Or early by insects, wind damage, tasseling and silking period encounter drought caused by the transmission of nutrients lack of seedlings, or flowering in case of rain, pollen fertilization obstructed, etc. can cause baldness, pods or empty grains. Prevention methods: First, to prevent the premature decline of functional leaves should be enough to apply phosphorus and zinc fertilizer, phosphate fertilizer or nitrogen and phosphorus compound fertilizer can be used as seed fertilizer, seed soaking with zinc sulfate, or soaking with corn seed soaking; Second, to strengthen the control of pests in the later stages, For corn, small spot disease can be sprayed at the beginning of the disease; the third is to do a good job of drought relief. In addition, when the weather is not good, it is best to artificially pollinate pollination.
The fourth is to prevent lodging
The density of exudates is too large. When the stems elongate, the management of water and fertilizers is improper, and it is easy to cause lodging and affect the yield. Control methods: When planting, the depth of the cultivation layer should be deepened, base fertilizer should be added, and the soil should be properly cultivated when cultivating, so that the corn can take root firmly. Fertilizer should pay attention to the combination of nitrogen, phosphorus and potassium, and pay attention to the plant density to ensure that the growing leaves have enough sunlight to make the plants robust and increase their lodging resistance. At the same time, pay attention to the application of plant growth regulators and implement dwarfing cultivation. As corn gradually grows from thin to dense planting, with sufficient fertilizer and water, corn plants are more likely to increase. Therefore, reducing the height of tall plant corn and implementing dwarf cultivation are significant for reducing lodging losses. In addition to the use of medium and dwarf varieties in production, plant growth regulators such as “corn robustin†and “chlormechanin†spray plants can reduce plant height by 30-60cm and reduce ear position by 15-20cm. Strengthen the ability of corn to resist lodging and improve the harvest index.
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