Maize lack of grain has two manifestations: one is that there are several lines on one side of the ear from the base to the top are not strong, that is, lack of line; the other is the "starry sky" lack of grain, that is, only a few grains on the ear. The former occurs mostly when the ear of a woman is stranded on a cloudy day, and the filaments droop toward one side, affecting the normal pollination of the lower filaments. This phenomenon is more likely to occur when the growth angle is large. The latter occurred on plants with late ear development and late wire drawing. First, the main reasons for lack of corn 1. Improper density. When the density is too large, the plants are prematurely sealed and closed, so that the functional leaves of the ear are insufficiently exposed to light, lack of nutrition, and the axillary buds cannot be converted into flower buds, which affect the growth and development of the ear. At the same time, the overlapping of the leaves often causes the filaments to be covered by the leaves. , but can not pollinate caused by lack of tablets. 2. Malnutrition supply imbalance. If phosphorus and potassium are absent, ear differentiation is delayed, flowering is delayed, and even if nutrient transport is hindered, female flower development is destroyed. Male sterile pollen increased and pollination conditions deteriorated, causing deficiencies. 3. Impact of adverse weather conditions. If the soil moisture is insufficient, the interval between flowering of the male and female flower spikes can be prolonged for more than 10 days. When the filaments are taken out, the pollen source is often insufficient, and pollination opportunities are lost and baldness is formed. The male and female spike differentiation period is like rain and rain, lack of sunshine, long-term water accumulation in the soil, poor ventilation, weakened absorption capacity of the roots, less nutrient substances, and can not be normal after ear differentiation or differentiation, and affects normal pollination. For example, in late August this year, there will be continuous rainy and cool weather in some regions, which will be more detrimental to corn yield and should be guarded against. 4. Improper cultivation and management. Poor seed quality, extensive site preparation, and large soil masses have resulted in uneven seedlings, different plant growth potentials, strong bullishness, and low bullying. In addition, if the sowing date is too early and late, the management of the cultivator is not timely, resulting in weed damage. 5. Lay down. In the corn tassels or lodging after tasseling, the ability to restore upright corn is limited, lodging will have a greater impact on the nutrient accumulation during pollination and grain filling, mainly as a lack of grain, baldness and other phenomena. From the corn trumpet period to the present, there have been several severe wind and rainy weather conditions in central and southern Guizhou, with severe local lodging. Among them, the lodgings that occurred on August 15 are the most serious and management should be strengthened. Second, the lack of corn control measures 1. Select varieties with strong resistance, improve soil preparation, sowing quality, and reasonable density. 2. timely, appropriate amount of fertilizer. In addition to the application of base fertilizer in production, the requirements for nutrient requirements for different growth periods of maize, and reasonable top-dressing, with particular attention to top-dressing attacking grain fertilizer. 3. Artificially assisted pollination. Baldness and lack of grain are mainly due to poor pollination and lack of moisture and nutrients. Therefore, after heading (especially after encountering bad weather), artificially assisted pollination is performed to increase seed setting rate and 1000-grain weight. 4. Receive timely and late. Re-harvesting when the corn husk leaves dry quickly helps increase yield. Scalpel Blades,Surgical Blade,Safety Scalpel,Surgery Blade Surgimed Medical Supplies Co.,Ltd , https://www.surgimedcn.com