Reasons for baldness In addition to the genetic characteristics of maize varieties, the main reasons are as follows:
One is lack of nutrition. Phosphorus deficiency in the soil affects cell division. Especially in the filament elongation period, the phosphorus deficiency filaments are elongated slowly and affect pollination. If the grain at the top of the ear is small and is abnormally white, it is characterized by phosphorus deficiency and potassium deficiency, especially potassium deficiency.
The second is the degradation of spikelets. Spikelets at the top of the ear, degenerative malformations, sometimes male or female flowers or male flowers develop and female flowers do not develop. It affects the normal pollination of corn and is difficult to be strong.
Third, the filaments develop late. The filaments at the top of the ear are developed late, and the silking is delayed. It is often not matched with the pollination of the male flowers, so that it cannot be firm.
The fourth is dry and water shortage. Maize encountered drought during flowering pollination, and the flowering interval between male and female flowers was prolonged, which led to the missed tassel loose powder during the extension of the filament, resulting in poor pollination.
The fifth is excessive close planting. Excessive planting density causes poor ventilation and poor light transmission conditions in the late growth stage of corn, which affects the normal growth of corn.
Sixth, the soil lacks micro-fertilizer. Boron deficiency in soil has an adverse effect on the formation of pollen and pollination activity of maize male flowers. When zinc deficiency occurs, the leaves of the old seedlings appear white spots, and rapidly expand, forming local white areas and necrotic spots, shortening between the nodes, and easily causing the growth and development of the ears to be deformed, leading to baldness.
One is a selection of good varieties. It is necessary to select high-yield, full-bodied, and viable coated seeds suitable for local planting, and to be treated by air drying and seed dressing before sowing. The planting density is generally about 4,000, the number of plants is increased appropriately in fields with poor fertility, and the number of plants is appropriately reduced in fields with better fertility. At the same time, it is best to use wide and narrow rows to avoid weak seedlings due to unevenness of fertilizer, water and light.
The second is reasonable fertilization. Fertilization should be combined with nitrogen, phosphorus and potassium, and appropriate application of micro-fertilizer. The plots with low fertility should be re-applied with top dressing, but it should be noted that the front and the rear are light and light, and prevent late-maturing. In the seedling stage, watering should be controlled to promote the differentiation of young spikes and shorten the interval between silking and silking, and increase pollination opportunities. In fertilization: re-application of base fertilizer. Apply farmyard manure and phosphorus and potassium fertilizer as much as possible. For medium-fertilizer fields, 750-1000 kg of high-quality farmyard manure, 6 kg of urea, 60-60 kg of superphosphate, 1.5~2 kg of zinc sulfate, and fields with poor fertility or good fertility should be applied per acre. Appropriate or less application. Skillful application of panicle fertilizer. 10 days before the heading of corn, which is often said to be the big bell mouth period, generally 25 to 30 kg of ammonium bicarbonate is applied per mu, and when the ear begins to spun, 3 kg of urea per mu is applied. Spray zinc fertilizer. The corn leaf was evenly sprayed with a 2% zinc sulphate solution during the jointing stage of the corn.
The third is to water the male flowering water. The corn is sensitive to water 15 days before the male is swallowed. When the soil moisture content of the drought is lower than 80% of the maximum water holding capacity in the field, it should be watered immediately. Conducive to corn pollination and grouting.
The fourth is artificial assisted pollination. During the flowering period of corn, it is necessary to hurry up in the morning after the dew is dried, and the male flowers begin to be scattered. It can be carried out every 2~3 days by pulling rope method or shaking method, and it can prevent baldness from happening every 2~3 times.
Author: Wang Ming
Source: Science and Technology Information
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