The flowering of wheat - the late grouting period is crucial to ensure the yield, and the management of water and fertilizer can not be relaxed later. Especially for modern high-product species, they are characterized by a large potential for late-stage yield increase and a greater need for nitrogen. However, at the same time, the risks and difficulties of water and fertilizer management in the later period are relatively large. In this issue, experts are asked to answer questions for farmers' friends.
The current summer crop, winter wheat, enters the later growth stage and is undergoing developmental processes such as grain filling and maturation. Looking at the farmland and taking a look at it seems to feel that the year of the summer harvest crop is expected, but it is hoped that it is not yet ready. Now that there is still a crucial period for the harvest of the summer harvest crops, the late water and fertilizer management of the summer harvest crop cannot be relaxed. As far as winter wheat grouting is concerned, this is the final crucial period for determining the winter wheat harvest. As the farmer stated: The wheat is harvested for three or more, and the panicles and grains are full. Although the number of panicles in the wheat field has been established, the number of grains is not yet completely determined. It is determined by the growth and development of this period of time as to whether grain filling or grain weight is greater. This shows that although the growth of winter wheat is in the late stage, the management of water and fertilizer in the later period must not be relaxed. It is important for the formation of production. Wheat grain filling, from the milk stage to the mature stage, should maintain a certain area of â€‹â€‹green leaves to have a higher photosynthetic efficiency, at this time to properly supplement the nutrients, prevent the leaves from reducing weight due to premature aging. As for the fertilization method, soil fertilization can be used, and the technique of dressing fertilizer outside the root can also be adopted.
The principle of water and fertilizer management in the later period depends on the situation of wheat. It is neither necessary to top-up irrigation or irrigation, nor is it to control water and fertilizer. The characteristics of fertility in late wheat are based on grain formation, including flowering and fertilization, grain filling and other processes. It will determine the number of grain weight and number of grains and play a crucial role in wheat yield. Since the leaves are photosynthetic products of wheat and organs for transpiration, if the leaves are too late to be senescent at a later stage, they will be detrimental to grouting; if the leaves are too lush to ripen late, it will not be conducive to high yield. To this end, the goal of water and fertilizer management is to maintain the vitality of the root system, extend the leaf functional period, and prevent premature aging and late maturity. In order to promote the operation of photosynthetic products to grains, strive for grain weight, take the following management measures for different wheat conditions:
For wheat fields whose heading color is significantly reduced and whose population is not large, nitrogen fertilizer can be applied once. At the same time, watering the flower-grouting water. The amount of nitrogen fertilizer should be appropriate, you can make up a small amount of nitrogen, if more will lead to late maturity or even lodging, you must master properly to achieve the purpose of increasing the number of grain weight and grain number. Nitrogen fertilizers may use ammonium sulfate, ammonium bicarbonate or urea. Two days ahead of time with urea. The net amount of nitrogen does not exceed 1.5-2 kg per mu.
For large populations of wheat fields, in order to prevent lodgings caused by dry hot wind during the later period, two concentrations of humic acid and potassium dihydrogen phosphate (0.2% to 0.5%) plus urea (0.5%) were sprayed during the post-anthesis period. % to 1%) of the mixture; can also be sprayed with silicon fertilizer and humic acid fertilizer (concentration of about 1%). Where foliar spray fertilization materials, generally have to spray twice, interval 4 to 5 days. This will not only help preserve the weight of grain, but also help prevent the lodging problem caused by dry hot air.
In normal wheat fields with irrigation conditions, according to soil moisture conditions, timely irrigation of flowering water or grout water before the peak of grain filling, this water is conducive to the development of wheat endosperm, increase the skin and caryopsis, and thus increase the storage capacity.
In short, the post-natal fertility of wheat flowering and grouting is of vital importance in maintaining yield. Late water and fertilizer management must not be relaxed. Especially for modern high-product species, they are characterized by a large potential for late-stage yield increase, and a greater need for nitrogen at a later stage. Water and fertilizer management in later stages is the key to high-yield production. However, the risk and difficulty of the management of water and fertilizer in the later period is also greater. It must be appropriate to prevent it from causing greediness or premature aging, both of which will lead to a reduction in production.
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