First, the density is too large. Because of poor ventilation and light in the field, lack of light, photosynthesis of plants weakened, thus affecting ear differentiation, so that the ear can not develop normally. Therefore, the greater the density, the more empty stalks and the more severe the lack of granules.
Second, the lack of phosphorus. Phosphorus has a great impact on the differentiation and development of the ear. Phosphorus is lacking, and the development of the ear is slow and even stops, resulting in a short and deformed stick, which increases the occurrence of corn stalk. According to the physiological requirements of high-yielding corn, it is necessary to have enough phosphorus, potassium, and nitrogen fertilizers for effective supply within 2 to 3 weeks before heading.
Third, excessive application of available nitrogen fertilizer. In the already densely planted plots, the stems and leaves are steep and long, even lodging, and the upper and middle leaves intersect each other, which not only affects the development of the lighting of the female ear, but also affects the pollination of the female ear. It can also lead to more empty stalks and deficiencies. Severe serious consequences.
Measures to prevent the abnormal differentiation of maize ear (in the order of production process time):
First, choose more resistant varieties. This point remains to be examined and accumulated in our future cultivation practices. It is the first time that we encounter the special drought once in 60 years.
Second, according to the characteristics of climate, grasp the sowing time. I plant the appropriate period for the late March to early April.
Third, according to species characteristics, soil properties (water retention and fertilizer supply capacity), do a good job of reasonable close planting.
Fourth, according to the law of fertilizer requirements of maize varieties and soil conditions, grasp the top dressing time and the type and amount of fertilization to avoid excessive use of fertilizer during the seedling period. Pay attention to the balance of nitrogen, phosphorus and potassium micro-multi-elements, and the total organic and inorganic components; pay attention to fertilizers in stages, catch seedlings and seedlings, and strengthen the quality.
5. When there is a phenomenon of multiple ears, keep the top 1 or 2 spikes and remove the lower ear in time to save nutrients, concentrate the supply of the upper ear, promote the large grains and increase the yield.
Sixth, in the maize ear and ear differentiation period and the critical period of water demand, (in the 2-3 weeks before and after flowering and pollination) in case of drought, timely watering, drought-resistant cooling, in order to facilitate the normal differentiation of maize ear.
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