The lack of grain in corn manifests itself in many forms. On one side of the ear, there was no grain on the side of the whole root from the base to the top, and the panicles were often bent to the side of the lack of grains; some of the whole fruit had few seeds and scattered on the ear; some seeds on the top of the ear were small and white or Yellowish white, called baldness. Due to lack of grain and baldness each year, corn causes great losses to corn production, which can reduce production by more than 10-15%, and it has a tendency of increasing year by year. Therefore, prevention of corn deficiency and alopecia is a key measure to increase corn yield.

First, the main reasons for lack of grain and corn

1, the density is not suitable, lack of nutrition. The lack of moisture affects the manufacture and rotation of organic matter, especially if the density is too high is an important cause of lack of grain and alopecia. Because the farmers believe that they have the experience of “the money to buy seeds and no money to buy seedlings”, the sowing density is too high. The number of normal maize seedlings per mu is 3,500-3,800, and that of some mu farmers is over 4500-5000. In 2006, we investigated the 3,400-3,800-mu plot of the Mubao seedlings, and the corn grain alopecia rate was 4-6%, while the musk-seedling seedlings in the 4500-5000-mass plot had a 10% lack of grain and apices, and spikes. Small, many empty stalks, production decline.

2. In case of high temperature and dry weather during flowering, the soil moisture is insufficient, and the lifespan of pollen filaments is shortened. When loose powder is used, even cloudy rain or drought may affect normal flowering and pollination.

3. The pollen on the underside of the ear is not pollinated well or the silking is late. The pollen in the field is rare. As winter is generally higher in winter in our county, the temperature in spring is low, the temperature is slow, and the internal temperature is slow. This causes the corn planting period to be delayed and the growing period to be delayed. The tasseling of corn is later, affecting the pollination of the filaments, resulting in lack of grain and baldness.

4, due to improper use of pesticide residue or application of pesticides before, the amount of medication is too large to cause injury to corn. In particular, fomesafen, clomazone, and 2,4-D butyl ester cause phytotoxicity to corn, resulting in the inhibition of corn growth, delaying the growth period or not attracting males, and resulting in lack of grain and baldness in maize.

5. The quality of the variety is poor. Due to the interests, the unscrupulous trader distributes poor quality seeds with low quality. The unqualified varieties do not cause corn grain and baldness.

Second, prevent maize lack of grain and bald measures

1, to seize the soil moisture preemptive sowing: the main factors affecting the growth period of corn is temperature and light, corn is a warm, happy light, like fertilizer crops. Corn seeds can germinate quickly when the temperature is above 10-12°C. Therefore, when the temperature is stable through 10 °C, timely sowing should be timely and promote early maturing. The best sowing time in my county is around May 25.

2, increase the base fertilizer: due to the development of corn root system, the need for more fertilizer, relying solely on the nutrition of the soil is far from meeting the needs of the entire growth period of corn fertilizer. Therefore, the application of basal fertilizer is an important condition for the increase of corn yield. Maize base fertilizer should be dominated by delayed organic fertilizers, supplemented by chemical fertilizers, and reasonably matched by N, P, K, and Zn. During the development of corn, the slow decomposition of basal fertilizer can continuously supply corn nutrients.

3, rational dense planting: planting density should be properly planted according to the characteristics of the species, can not be too dense or too thin. When the density is too dense, photosynthesis is low and organic matter is small, affecting normal pollination and increasing the lack of grain and baldness. Excessive dilution results in an unacceptable number of harvested plants, which affects yield. Generally, on the basis of ensuring the number of trees per mu, remove the weak seedlings and keep strong seedlings, and strive to harvest 3500-3800 plants/mu.

4, due to artificial seeding caused by seedlings are not neat or produce weak seedlings, and the number of acres of seedlings can not reach the plot, the weak seedlings to be partial. Strive to achieve a well-developed, consistent drawing.

5, artificial pollination: for some late development of the ear or poor development pollination, should be artificially assisted pollination, can reduce the incidence of alopecia areata.

6. Applicable varieties: Some varieties themselves have a lack of grain and baldness, and they should be selected from the local effective accumulated temperature as early as 100°C to adapt to the local climate characteristics.

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