The late stage of wheat growth refers to the stage from heading to maturity, and it is also the period in which the economic output (grain) of wheat is formed, and it is the most critical and most important period in wheat management. During this period, the water and nutrient supply of wheat fields have a direct impact on yield formation. Therefore, it is necessary to effectively regulate water and fertilizer to meet the physiological needs of wheat for normal development.
Special attention should be paid to prevent two extreme phenomena: one is defertilization (premature attenuation due to malnutrition), and the other is greed (because of overnutrition often leads to prosperous growth and late ripening and dryness).
The late stage of wheat growth refers to the stage from heading to maturity, and it is also the period in which the economic output (grain) of wheat is formed, and it is the most critical and most important period in wheat management. During this period, the water and nutrient supply of wheat fields have a direct impact on yield formation. Therefore, it is necessary to effectively regulate water and fertilizer to meet the physiological needs of wheat for normal development.
Special attention should be paid to prevent two extreme phenomena: one is defertilization (premature attenuation due to malnutrition), and the other is greed (because of overnutrition often leads to prosperous growth and late ripening and dryness).
Later management should focus on "rooting, leaf protection, grain preservation, and weight gain". Booting to heading is the critical period for wheat to require water throughout its life. If the wheat is affected by drought in this period, the yield will be severely reduced. Therefore, it is required that the soil moisture in the wheat field in this period should be suitable. At the same time, the application of fertilizers should be cautious. According to the conditions of the wheat seedlings, spray fertilizers on the outer roots and leaves. For wheat fields with normal seedling conditions, potassium dihydrogen phosphate should be added to increase the intensity and rate of grouting, increase grain and weight and increase yield. For wheat fields with signs of defertilization (yellow leaves, small and weak population growth, and red spider hazards), urea, amino acids, and micro-fertilizers should be added to promote greening, greening, and delaying aging.
For wheat fields that grow too vigorously and tend to grow greedy and green (the leaves are black and green, the population is too large and dense), it should prevent falling, disease, and late maturity, strictly control watering, and prohibit the use of *** fertilizers. Avoid droughts and watering, and do not spray nitrogen-containing foliar fertilizers, and only spray relevant pesticides to prevent diseases and insects in the later stage. Generally, spraying fertilizer can be combined with the prevention and control of plant diseases and insect pests, making overall planning and comprehensive utilization, and implementing "one spray and three prevention" from the booting stage to the filling stage. It can be used per acre with 150 grams of potassium dihydrogen phosphate (fertilizer), 20 ml of 1.8% abamectin EC (for insect control), 40 ml of 20% triadimefon EC (for disease prevention), and 5 grams of 0.1% 481 brassinolide (to promote growth) ), spray with 50 kg of water, spray 2-3 times in an interval of 7-10 days. However, it is necessary to adjust the increase or decrease of pesticides and fertilizers according to the conditions of wheat field seedlings, diseases and insects, to ensure the actual effect of preventing diseases and pests, reducing disasters and increasing production.
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These test kits are new to the market and rely on the detection of viral proteins in swab samples They consist of monoclonal antibodies specific for the viral antigens and results are seen by the naked eye by way of chromatographic particles. There have only been a few of these tests commercialized and normally require a high viral count to work effectively. In the first few months of the pandemic some national health authorities questioned the reliability of these tests, as they usually require a higher viral count that qPCR to show positive. Therefore, false-negatives can occur.
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