In the process of corn planting, due to poor growth environment, cultivation management and other factors, there is often a phenomenon that only sticks are not strong, which has a great impact on corn yield.
Symptom Analysis There are many different types of corn ear-skinning, but there are roughly five categories:
1 empty tree, the whole plant does not bear 2 "half face", the whole ear of the corn has no child 3 "tips", the top of the corn has no seeds or dried seeds, 4 "starry", the ear of corn is scattered, 5 ears of corn The reason for the lack of grain at the base of the stalk is that the optimum temperature for temperature and humidity is not suitable for corn flowering is 22~26°C, and the optimum relative humidity is 65%~90%. The drought before tasseling makes the florets at the top of the ear dysplasia, the ear Delayed silking; drought and water shortage after tasseling, the silking of the ear will be postponed, so the interval between tassel flowering and female silking is relatively prolonged, resulting in no flowering period, affecting pollination; high temperature during drying, low relative humidity, pollen Loss of vitality, only a small amount of filaments are pollinated, resulting in lack of grain.
Poor climatic conditions During the period from the big trumpet to the heading, it is the period when corn needs the most fertilizer. If the weather is dry, it will affect the normal flowering of the tassel and the extraction of the fringe of the ear, causing the tassel to advance and the silking delay, the vitality of the pollen is weak, the filament is easy to wither, and the pollination is poor.
During the pollination period of corn, if the rainy weather is insufficient and the weather is insufficient, the pollen will swell and rupture to death or stick into a mass, losing the ability to pollinate, so that the fringe of the ear can not be pollinated in time, which will result in empty or "stars".
During the pollination period of corn, the temperature of the weather exceeds 35 °C for several days. The air temperature is high and the relative humidity is lowered, which will cause the pollen ability of the fringe to be weakened, the pollen viability of the tassel is reduced, and the survival time is shortened, resulting in poor fruiting.
Poor nutrition, malnutrition, lack of nutrition in the stage of ear differentiation, weak photosynthesis, less accumulation of organic matter, causing poor development of the ear, leading to empty trees, or affecting the rate of pollination; overnutrition will cause strong vegetative growth, weakened reproductive growth, affecting females Normal development of the ear results in poor or weak corn. In the late growth stage, nutrients and water are insufficient, and the top filaments are spit out late, the female flowers are degenerated, the stigma is metamorphosed, and the filaments are stacked, and the grains are also formed.
The cultivation problem is too large, resulting in serious shading, poor illumination, poor ventilation and light transmission, reduced photosynthetic efficiency, affecting the development of the filaments of the ear, resulting in poor pollination of the corn.
Insufficient soil fertility Soil fertility is one of the important reasons for corn to produce empty stalks. Under the same planting density, the fertilization is less than that of fertilization; the lower the fertility, the higher the density, the worse the firming; the application of single fertilizer is higher than that of formula fertilizer, and the application of nitrogen, phosphorus and potassium is reasonable. It can effectively increase the seed setting rate, increase the rate of spikes in the absence of potassium; decrease the seed setting rate in the soil when nitrogen and phosphorus are absent; when the boron is deficient, the photosynthesis of the plant is affected, the transport of nutrients is blocked, and the ear is damaged by energy. The seed setting rate will also drop.
If the pests are damaged by aphids, corn borers, spider mites, spider mites, large-sized spotted diseases, smut, herbicides, etc., they may lead to premature senescence of the functional leaves, intrusion of the pests into the ears, insufficient supply or obstruction of nutrients. , often form empty spikes or can not be properly grouted after being pollinated.
Red spiders mainly harm the leaves, making corn unable to perform normal photosynthesis and seriously affecting fruiting.
The mites mainly harm the tassels, causing the tassels to lose their juice and dry up.
Corn borer mainly damages stems and leaves, ear, and hinders the transmission of water and nutrients. The grouting is not true and the plants are prematurely debilitated.
Corn smut and sheath blight mainly damage the leaf sheath and leaves. In severe cases, the ear can not be silked and dried or rotted, and even the whole plant is dead.
Large corn and small spot disease mainly damage leaves, and in severe cases, damage to leaf sheath and ear mites, resulting in insufficient amount of paternal pollen and obstruction of maternal silk, affecting corn seed production and pollination.
Preventive measures should be broadcast early in time: let the corn pollination period advance, avoid the hot weather, and let the corn pollinate at a suitable temperature.
Reasonable close planting: According to the characteristics of corn varieties, reasonable close planting is conducive to ventilation and light transmission, improve photosynthetic efficiency, increase ear nutrition, and promote ear differentiation.
Corn emasculation: Appropriate emasculation during corn tasseling, weakening the apical dominance of maize plants, promoting the development of female ears, assisting artificial pollination, and increasing pollination rate.
Reasonable irrigation: to prevent the occurrence of "ka neck drought" in the corn big bell period, timely watering in case of drought in the big bell mouth period, promote the development of ear and promote normal pollination and fertilization of corn.
Scientific fertilization: Using the formula fertilization technology, master the principle of “applying sufficient base fertilizer, lightly applying seedling fertilizer, re-applying joint fertilizer and booting fertilizer, and skillfully applying seed fertilizerâ€. The base fertilizer is mainly organic fertilizer, and is applied with appropriate amount of nitrogen, phosphorus and potassium fertilizer. The topdressing is mainly based on nitrogen fertilizer, which is mainly carried out at jointing and booting stage, and the attacking fertilizer is properly applied in the later stage.
Strengthen pest control: During the silking period of corn stalking, pay attention to the prevention and control of corn mites and mites. The main chemical control is spray.
Plastic frame shaker screen,High Quality Plastic frame shaker screen,Plastic frame shaker screen Details, CN
Anping Shengjia Hardware Mesh Co.,ltd , https://www.oilshakerscreen.com