First, sowing date
"Weak late sowing, sowing early, timely planting wheat seedlings." In late sowing of wheat, due to low temperature, late emergence, small plants before winter, fewer tillers, poor root growth, poor seedlings, cold hardiness of wheat seedlings; at the same time, due to low tiller in winter and low tillering rate, Ears less. Late planting is not good and sowing is not good too soon. Because seedlings are sown prematurely under higher temperature conditions, the quality of seedlings is weak, not only susceptible to diseases and insect pests, but also more tillers, large groups, easy to form Wang Miao, but prosperous but not healthy, dry matter accumulation is small, there are The jointing before the winter, the wintering period is very vulnerable to frost damage. Therefore, we must reasonably determine the sowing date according to the characteristics of the variety.
Second, the amount of broadcast
The suitable sowing amount of wheat differs depending on the variety, sowing date, and soil fertility level. In the case of appropriate sowing, finely seeded high-yield wheat fields, high spike rate varieties of 10 to 120,000 per acre basic seedlings, varieties with low percentage of spikes can be appropriately increased sowing. Semi-finished sowing in the production of basic seedlings per acre 13 to 150,000. Dry wheat fields have 12 to 160,000 basic seedlings per acre; late seedlings have 200 to 300,000 basic seedlings per mu. It is necessary to vigorously promote precision and semi-precision sowing techniques, especially for varieties with strong tillering ability, high spike-forming rate, and plots that are earlier in the sowing period, so we must pay attention to reducing the sowing volume. If the sowing date is postponed, it is necessary to appropriately increase the sowing volume. Generally sowing every day for one day, the sowing volume will increase by 0.25--0.5 kg. When planting sowing seedlings to be used, require accurate sowing, the next kind of uniform, the same depth, to ensure sowing quality.
Third, lyricism
The following is the key to ensure that seedlings are full, Miao Qi, and Miao Zhuang. "Every year the wheat is harvested" is the importance of emphasizing the bottom. Astragalus seeding or lack of oral hygiene, slow emergence but not homogeneous, delayed delivery, lack of delivery, thin seedlings weak. Therefore, we must do enough. The suitable soil moisture for wheat emergence is 70%-80% of field water capacity. If the autumn season is suitable, it is necessary to plough the crops in time after the autumn crops are harvested, and sow the plots; if the plot lacks sensation, attention should be paid to crop cultivation. In the appropriate period, we should master the principle of "appropriate late sowing, we must also make footwork".
Fourth, broadcast depth
The suitable sowing depth of wheat varies according to weather conditions, soil quality, and lyricism. When the climate is dry, soil is soft, and there is a shortage of lye, sowing can be appropriately deepened. Generally, the sowing depth should be 4 to 5 cm. The soil with heavy clay and sufficient moisture can be slightly lighter. The sowing depth is usually 3 to 4 cm. It is appropriate. After sowing, attention should be paid in time to repression, bridging earth seams, and consolidating the soil so that the seed and the soil can be closely combined. This will facilitate the lifting of the earthworms, early emergence of seedlings and competition for seedlings. Pour the land of the headwaters, soaking should be a bit shallow. When the ground is dry, it should be removed in time and the compaction should be removed to facilitate the emergence of seedlings.
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