The fertilizer applied before and after the jointing of wheat is called jointing fertilizer. Its main role is to be used for the development of leaf growth and young panicle growth during the development of wheat spike differentiation.
Fertility characteristics at jointing stage This period is the critical period for the growth of roots, stems, leaves and ears together. At this time, the roots were deeply distributed, the stem sections were short and thick, and the leaves were lifted. The organic nutrients required for the differentiation and development of spikelets were sufficient, which was conducive to high yield. The growth of stems at the jointing stage can be divided into four stages: the formation stage of differentiation between nodes and nodes, the elongation and thickening stage among nodes, the material enrichment stage, and the material output stage. The first three stages are related to the morphological characteristics of the stem. In the first and second periods, the period of elongation is long and thick, that is, when the spring three and the four leaves are exposed, the former is the formation period of the section and the internode, and then the material enrichment period is between the first and the second. This stage should be Control of fertilizer and water, to avoid overgrowth of stems and leaves, resulting in too long thin stems, stems too thin; but also pay attention to the rush to plant growth and demand for fertilizer and water. Therefore, at this time, the amount of irrigation water should not be too large, and strive to achieve both the plant's demand for fertilizer and water, but not too much lead to stem and leaf prosperous. During this period, the number, morphology, and size of leaves are the main aspects that make up the group's characteristics. According to the growth characteristics of the leaves and the relationship between them, the growth of the lower leaves must be controlled to avoid overgrowth of the inverted four leaves. Therefore, water and fertilizer should be controlled at the beginning of the growth stage so that the characteristics of the leaves can be reasonably long and short. To improve the quality of spring five leaves, so that in the later growth phase of booting, the leaves form a large number of photosynthetic products to the grain transport, increase wheat yield.
The method of jointing fertilizer application seized this period of reasonable application of jointing and panicle fertilizer. It is possible to preserve the panicles and prevent the internodes from growing too long. The high-yield cultivation should be based on the application of organic fertilizers, applying 18 to 20 kg of pure nitrogen per mu, and the amount of nitrogen applied to the seedlings will account for 60% of the total amount, and the balance will account for the balance. 10%~15%, jointing and booting, 25%~30%, the ratio of N, P and K increased to 2:1:1. General plots apply 25% three-element compound fertilizer 50 kg per acre, urea 10-15 kg; or urea 15-20 kg, superphosphate 50 kg, potassium chloride 10-15 kg, is to consolidate the tiller into a spike, cultivate strong Key measures for culm spikes. In the early stage of the jointing of wheat, the tillers with less than three leaves in the base part of the pods generally do not form a panicle and will gradually die later, and these tillers are called invalid tillers. Wheat production that promotes growth within 15 to 20 days before jointing usually does not result in emergence. The application of back green manure is too late to increase the final acres into a panicle; if it is applied too late, it will increase the number of invalid tillers in the field, and the percentage of spikes will decrease, which is not conducive to high yield. At the beginning of the jointing stage, the field main stem and more than 3 leaves of Oita 350,000 per acre field, should strictly control the application of jointing fertilizer, then allow moderate yellowing of wheat leaves, is conducive to promoting the death of the base of small ineffective delivery, reducing the number of groups. For over-emerging growth, the larger the group, the more the application time of panicle fertilizer is delayed. At the beginning of the jointing stage, the field main stem and more than 3 leaves of Oita are less than 350,000 pieces of land per acre. If the number of small tillers is not large, jointing fertilizer should be applied as early as possible to increase the number of tillers and spikes. 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 the formation of the panicle into the panicle, and the basic length is set between the second and the third. Big ear formation; if the leaves of young wheat seedlings are yellow in color at the beginning of jointing, and the seedlings are weak, one-off fertility can be applied to ensure that the total nitrogen reaches 5 to 7.5 kg. For weak and yellow thin wheat seedlings, the amount of nitrogen fertilizer can be increased, and Increase phosphorus and potassium fertilizers. In addition to the application of nitrogen fertilizer, joint-fertilizing and panicle-preparing panicle-fertilizers are suitable for increasing potassium fertilizer, which is conducive to stalk enrichment, improve lodging resistance, and is conducive to young panicle differentiation and development. Fertilizers are best applied in caves or in furrows, but they can also be applied after rain and snow. For some thin or thin seedlings can also be used 0.5% urea plus 0.3% potassium dihydrogen phosphate liquid foliar spray to quickly add fertilizer, promote the transformation of the situation, achieve balanced growth.
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