Standard wheat seedlings before winter
The pre-winter seedlings of wheat have the following criteria: the main stem of the spring species grows 6 leaves or 6 leaves and 1 heart, and the individual plants have 3-4 lice, plus the main stem should reach 4-5; The species grows 7 leaves or 7 leaves and 1 heart. There are 5-6 individuals in each plant, plus 6-7 main stems. The collective performance is that the total number of plants should be 10 million plants per hm2. Should account for more than 1/2;
Strong roots per plant, with more than 10 secondary roots, long-phased piers, plant height generally not exceeding 27cm, but not less than 20cm; normal panicle differentiation, spring type should reach the ridge, semi-winter species should reach the single Above the rib period; the plant dry weight is about 1.2g, and the dry weight is 250kg/hm2 or more.
Pre-winter strong seedling cultivation techniques
Timely cultivation
The early sowing or late sowing of wheat is not conducive to transforming into reproductive growth and shortening the composition and development of young panicles; on the other hand, it hinders normal nutrient function and leads to incoordination of organic and inorganic nutrients in wheat. The most important kind of cultivation is to select suitable types of crops based on local climatic conditions and soil conditions. With respect to thin and sandy lands, the scale of cultivation is relatively narrow, so early sowing should be organized. For deep-seated, soil-viscous, and water-reserving and strong-fertilized wheat fields, the farming season is of a large scale and can be properly organized for late planting.
Seedlings and Miao
Checking seedlings and making up seedlings promptly after sowing is an important way to ensure collective excellence. During the three to four leaf stages of wheat, it should be promptly packed and replenished. It is also possible to supplement seeds early with the same moist seeds. The process of transplanting must ensure that the depth of the earth covering is “no pressure and no whitenessâ€. After replanting or replanting, watering should be promptly performed and the fertilizer should be reasonably compensated.
Controlling Wang Miao
As for the cultivation of Wang Miao that can be cultivated too early, it can be used to suppress and control the appetite. After the pressure is applied, it must be plucked in time, and appropriate amount of water and fertilizer should be applied. With regard to Wang Miao caused by excessive cultivation, we must promptly sparse the seedlings, and then combine watering to make up the appropriate amount of quick-effect fertilizer. Inadequate selection of species can also result in the development of Wang Miao phenomenon. It is not only necessary to cultivate and pressure early in this situation, but also to adopt measures such as soil sealing and root closure.
With regard to Wang Miao caused by excessive fertilizer and water, when the main stem of the wheat seedling grows 5-7 leaves, it is necessary to cut off part of the root system to control the growth of the aerial part of the wheat seedling. With regard to Wang Miao caused by the excessive cultivation of arable cows and clods in wheat fields, it should be suppressed before freezing on the ground. Saline-alkali soil should not be used to control the seedlings by suppressing pressure. Other land-use pressures should be carried out at noon.
Scientific management of water and fertilizer
Appropriate amount of watering can also play a role in crushing clods, building up soil and eliminating pests. Therefore, it is very important to pour overwintering water, especially in areas with poor soil quality. Sprinkling before wintering should be done in the sunny morning. The amount of watering should not be too large, but it must be ensured. When the watering is completed, the water must be removed in time and the compacted soil must be removed.
Applying base fertilizer is also an important guarantee for safe winter wheat. The wheat fields that are suitable for the collective and the soil, and have normal growth, generally need to be ploughed, and do not need to be topped with water. For wheat fields that lack application of fertilizer, soil quality is poor, and fertilizer deficiency symptoms are significant, they should take advantage of opportunities to spray fertilizer before winter. Http://Content/21c4c415-00c5-4d49-83c2-f5268141ea26?cType=2
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