How to prevent corn lacking
Maize lack of grain manifestations in many forms, one is that the side of the ear from the base to the top of the whole row without the grain, the ear shape more than the side of the grain defect; the second is that the whole fruit node with few seeds, scattered in the ear distribution; The top of the ear is fine, white or yellow-white, known as bald, severe bald tip can account for more than half of the entire ear, bald tip is the main form of corn granules. First, the main reasons for the lack of grain in corn The reasons for the occurrence of alopecia areata are closely related to the severity of the occurrence of varieties, soils, nutrients and fertilizers, climate, cultivation and management, and pests and diseases. 1. Varieties Due to different varieties of adaptability to the external environment and resistance to adverse environments are different, when the bad external environmental conditions exceed the range of adaptation of the varieties, it is prone to alopecia areata. 2. The soil salinity soil has high salinity, low grazing and easy hoeing, shallow ploughing layer, poor water storage and fertilizer retention capacity, and thin soil, baldness, and lack of grain. 3. When nutrients, fertilizers, and fertilizers are applied, N, P, and K are improperly combined, and organic fertilizers and trace fertilizers are not applied or applied less, especially phosphorus and boron fertilizers are insufficient in the soil; or in the middle and later stages of maize growth, the water supply is insufficient, especially corn flowering grouting. The lack of water and fertilizer will affect the production and operation of the organic matter of the plant, which will lead to later spinning of the corn, reduce pollen in the field, shorten the life of the pollen and filaments, and lead to the lack of grain in the corn. 4. The continuous drought during the mid-term of maize production caused many times of leaf curling, or high temperature and dry weather during flowering. The lack of supply of soil moisture affected the development of male and female corn ear, or the continuous rain and pollination during the corn powder loosening affected the normal flowering and pollination. Or pollination when the weather is poor wind pollination, can cause alopecia areata. 5. Cultivated management and management Excessive planting density or planting, resulting in poor ventilation and light in the field, lack of light, plant photosynthesis weakened, reduced synthesis of organic matter, affecting the development of the male and female corn ear, causing alopecia areata. 6. Degree of occurrence of pests and diseases Various corn leaf spot diseases and corn seedling blight, sheath blight, and stem rot may affect the normal growth and development of corn, resulting in poor corn growth, especially corn worms It began to occur in large quantities, causing corn to fail to flower and pollinate normally, causing alopecia areata. Second, prevention measures 1. Planting good varieties According to the local climate characteristics and cultivation conditions, select and plant varieties with resistance to disease, insect resistance and adaptability. 2. Improve the soil's ability to enhance soil moisture and fertilizer retention. Promote the use of composting, deep plowing, and cultivating techniques that are fermented with enzymes to improve the structure of the soil, promote the growth and development of corn, and increase its ability to resist adverse environmental conditions. 3. Appropriate organic fertilization for reasonable fertilizing water, reasonable application of nitrogen, phosphorus and potassium, especially to prevent the lack of phosphate fertilizer and boron fertilizer in the field; in the water supply, to prevent drought damage and crop damage, vigorous development of reproductive organs after jointing of corn The water supply should be timely and appropriate to promote the development of male and female ear. 4. To strengthen the cultivation and management First, it should be closely planted. According to varieties, soil strength and cultivation methods, the density should be determined according to local conditions to create good ventilation and light transmission conditions, meet the light requirements of the middle and upper leaves, and promote the development of male and female ear. The second is to strengthen the cultivator weeding and earth-cultivation techniques, especially after the jointing of soil, can increase the permeability of the soil and promote the development of corn root system. The third is the use of large and small ridge planting techniques to improve the ventilation and light transmission conditions in the field. Fourth, when poor weather conditions are encountered and normal pollination is affected, artificial pollination techniques should be used. 5. Control pests and diseases 1 For the control of corn seedling blight, sheath blight, and stem rot, 30% of the seedlings can be used as an enemy wettable powder for 0.3% of the seed, or 12% of the triadimenol with 12.0% of the seed, 12.5%. The diniconazole EC seed dressing; can also be found in the field of diseased plants, with 30% of the seedlings of the enemy wettable powder 800 times, 50% thiophanate-methyl WP 800 times or 80% of the Green Hunter No.2 700-800 times liquid and diluted Tianda 2116 with a 1000-fold dilution spray have good control effect on corn seedling blight, sheath blight, and stem rot. 2 Prevention and treatment of various leaf spot diseases In the middle and later stages of corn growth, when corn leaf spot occurs, 50% thiophanate-methyl WP 800 times solution or 50% carbendazim WP 800 times solution can be used. Spray control.
It is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs. Its aim is often to find a source of a disease or to exclude pathology. The practice of examining pregnant women using ultrasound is called obstetric ultrasound, and was an early development and application of clinical ultrasonography.
Ultrasound are sound waves with frequencies which are higher than those audible to humans (>20,000 Hz). Ultrasonic images, also known as sonograms, are made by sending pulses of ultrasound into tissue using a probe. The ultrasound pulses echo off tissues with different reflection properties and are recorded and displayed as an image.
Ultrasound Machine, Ultrasound Probe, Ultrasound Mindray,Ultrasound Diagnostic System Unimedsume Trading Co., Ltd , https://www.ums-labmed.com