Wheat dressing depends on seedlings

The return of green wheat can make wheat strong seedlings, increase glutinous rice, and prevent the group from becoming too large; wheat jointing fertilizer can make wheat maintain pods and promote ear and prevent internodes from growing too long. However, the returning green manure and the jointing fertilizer of wheat should all be made appropriate by the seedling system and be applied as appropriate to achieve the desired effect. Blind topdressing can also be counterproductive.

First, the rational application of green manure

The returning green manure of wheat is conducive to promoting the growth of wheat seedlings. The main manifestation is the increase of the tillering of the wheat seedlings, the increase of the wheat seedlings in the field, and the fertilization of weak seedlings can promote the transformation of the seedlings. In production, green manure was mainly applied to fields with weak seedlings and insufficient groups. When the field wheat population is too large, the application of returning green manure should be strictly controlled to prevent the population from becoming larger. In the early stage of returning green wheat, if there are more than 300,000 acres of seedlings per acre, if the leaf color is normal, no green manure will generally be applied. If the yellow color of the wheat seedlings is considered to be fertilization, it is necessary to strictly control the amount of fertilizer, generally according to the previous fertilization. , 5-10 kilograms of urea per mu can be used. In the beginning of returning to the Qing Dynasty, there are less than 300,000 acres of seedlings for seedlings with seedlings and mussels. See if sowing time and seedlings decide whether to apply green manure. Seeds that are sown early, with little emergence, or with poor growth during seedling stage should be fertilized properly to promote population growth. When sowing sow was sown, the temperature was low. On the one hand, the release of fertilizer was slow. On the other hand, the emergence of wheat sprouted late. After the roots were born late, the amount of basal fertilizer applied to the soil was absorbed less. These fertilizers were slowly taken until the temperature rose in the spring. Absorb large quantities. In these plots, unless the wheat seedlings show signs of falling yellow, do not generally use green manure.

Second, the rational application of joint fertilizer

At the beginning of the jointing stage, the field main stem and more than three-leaf Oita pods with more than 350,000 pieces of land per acre should be strictly controlled for the application of jointing fertilizer. Although wheat seedlings have entered the stage of panicle differentiation, the nutrients required for ear differentiation are less, allowing moderate yellowing of the wheat seedlings, which is conducive to the death of the ineffective small parts of the basal, and reduces the number of populations, so that the three basal parts of the wheat seedlings do not grow excessively long. This kind of plot can generally be regarded as the size of the group, and is set at a fixed length (2-3 cm) between the first internodes of the base of the young wheat seedlings, and the length of the second internode (3-6 cm) is then used as a panicle fertilizer. The larger the population, the more prosperous the field, the more the application time of panicle fertilizer is delayed.

If the number of small tillers is not large, the main stem and three or more leaves of Oita at the jointing stage should be applied as early as possible to increase the number of tillers and spikes and promote the early stage of jointing at about 2.5 leaves. The "shaking childbirth" became a spike. If the leaf color of young wheat seedlings does not fall in the early stage of jointing, the fertilizer is preferably applied in two stages. A small amount of fertilization at the beginning of the jointing stage promotes “shaking tillering” into the panicle, and then the fertilization is performed after the basic fixed length in the second season and the longest extension in the third internode. Promote the formation of large spikes; If the leaves of young wheat seedlings at the beginning of the jointing stage are yellow, the seedlings are weak and can be used for one-off fertility. In addition to the application of nitrogen fertilizer, jointing and booting of the joints, the appropriate addition of potassium fertilizer is conducive to stems and young spike differentiation and development. Generally about 5 kg of urea per acre. Fertilizers are best used for drilling or furrowing. They can also be applied before and after rain or during rain.

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