Mistakes were not properly selected. The sowing of spring and weak winter varieties in the middle and early springs will cause the wheat seedlings to prosper before winter, which is not conducive to safe wintering. Countermeasures: On the basis of early demarcation and repression, pre-winter soil shall be used to encircle the roots, or a cover shall be applied to “protect the head of manure†to protect the wheat seedlings from wintering safely.
Mistakes were sown early. The wheat sowing was too early. After the seedlings were unearthed, the leaves were narrow and long, and the pods were lacking. The main stem and a part of the big buckwheat were differentiated before entering the two-legged stage in winter. When winter was encountered at -10°C for 5 hours, the temperature was low. Freezing damage will occur. Countermeasures: timely repression, inhibition of the growth of the main stems and large maggots; pressure after the timely scratching, combined with watering, Mushi ammonium bicarbonate 15 kg, if necessary, with 0.2% ~ 0.3% chlorophyll solution spraying, Control leggy, resist freezing injury.
Mistakes were sown late. Due to the short growing period before winter and the lack of accumulated temperature, the growth of young wheat seedlings is thin and the number of tillers is small. Countermeasures: Mainly using paddling and replenishing fertilizers, and applying 10 to 15 kg of ammonium bicarbonate in the three-leaf stage; soils with poor soil moisture and fast water seeps, and timely pouring of drowning water after the three-leaf stage (however, suitable moisture or soil moisture, Poorly wetted plots should not be watered before the winter); the last time it is ploughed before freezing, it is necessary to pay attention to the soil surrounding the roots to protect the seedlings safely.
Four mistakes were sown. Wheat sowing depth of 3 to 5 cm is appropriate, sowing shallow (less than 3 cm), the growth of young wheat seedlings, bare tiller section, tiller is more than small, not drought tolerant, susceptible to frost and premature aging. Countermeasures: Squeeze a few times before emergence, and combine the roots of the soil after the emergence of seedlings. If necessary, cover the soil with a cover soil or cover the “headed manure†during the wintering period to prevent overwintering and freezing.
Mistakes were sowed five times. The wheat is sown too deep (more than 5 cm), the emergence is slow, the leaves are slender, the tillers are small and small, the secondary roots are weak, and the wheat seedlings are thin. Countermeasures: Timely clearing the earth. The method is to use a bamboo rake or shovel to start from the center of the sampan surface and cross the ridge. When clearing to the last line, all the remaining soil can be dragged onto the back of the squat. In addition, for the timely sowing of wheat, the sap It usually starts from the second leaf stage and ends when it is "little snow."
The number of errors six broadcasts is too large. The performance of the wheat seedlings is crowded, the plants are yellowish and thin, their individual development is poor, and there are few tillers. Countermeasures: First, sparse seedlings, especially in the fields, fields, and fields, should be sparsely and sparsely so as to establish a suitable group structure and promote individual development; finally, combine watering and topdressing with a small amount of nitrogen. Phosphorus-efficient fertilizer to make up for the excessive consumption of soil nutrients.
Mistakes in excess of seven bases. After unearthing, the wheat seedlings grow too prosperous and have more tillers, and the leaves are large, and the fields are extremely depressing. Countermeasures: When the main stem of wheat grows 5 leaves, it is 5-7 cm deep between the rows of wheat, cut off some secondary roots, control nutrient absorption, reduce tillers, and cultivate strong seedlings.
The lack of sensation after the error eight broadcasts. The performance of the emergence of wheat seedlings difficult, or after the birth of the childbirth is born slowly, leaf color grayish green, the heart is short, slow growth or stagnation, the base leaves gradually become yellow dry, small and thin roots. Countermeasures: After sowing wheat, it is necessary to check the soil moisture in time, affect the plots where the waterlogging condition is insufficient or drained, and conduct irrigation with small water. Water-free conditions can be promptly suppressed by 1 or 2 times.
After the error nine broadcasts, the soil is too wet. After the wheat seedlings were unearthed, the leaves were pale yellow and the tillers were born slowly. When they were severe, the tips of the leaves became white and dry. Countermeasures: Timely deep cultivating ventilation, and applying a small amount of quick-effect fertilizer to promote early-onset seedlings.
Mistakes occurred after the tenth seeding was incomplete. Countermeasures: After the sowing of wheat, the seedlings should be checked in time. Once the seedlings are found to lack seedlings, complete the supplements. The method is: replanting. Select the same variety as the lack of seedlings, first soaking seeds under suitable temperature conditions, germination, or soaking with 25,000 times naphthaleneacetic acid or 500 times potassium dihydrogen phosphate solution for 12 hours, and then sowing, to facilitate emergence and growth; plant. For land patches that are not ready for replanting and replanting, there is still a lack of seedlings that can be transplanted and planted on the spot in the wheat tillering period. Transplanting wheat seedlings should be selected to have 1 to 3 strong seedlings for transplanting. The depth of transplanting should be “not buried on the ground and not exposed on the groundâ€. The transplanting time can not be later than “little snow†to facilitate the growth. Seedlings and wintering.
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