First, the sowing period
"The late broadcast is weak, the early broadcast is prosperous, and the wheat seedlings are planted at the right time." Wheat is planted late, due to low temperature, late emergence of seedlings, small plants before winter, less tillering, poor growth and development of roots, no strong seedlings, weakened cold resistance of wheat seedlings. At the same time, due to low tillering before winter, the tillering rate is low. The number of acres is small. Late broadcast is not good, so it is not good to plant too early. Because the early sowing of wheat seedlings grows rapidly under higher temperature conditions, the quality of seedlings is weak, not only vulnerable to pests and diseases, but also many tillers, large groups, easy to form Wang Miao, but Wang is not healthy, less dry matter accumulation, there are In the winter before the jointing, it is easy to suffer from freezing damage during the winter. Therefore, it is necessary to determine the sowing date reasonably according to the characteristics of the variety.
Second, the amount of broadcast
The suitable amount of wheat to be used varies depending on the variety, sowing date, and soil fertility level. Under the condition of suitable sowing, the high-yield wheat field is finely sown, and the varieties with high ear-forming rate are 10 to 120,000 per mu, and the varieties with low ear-forming rate can increase the amount of sowing. The semi-precision mid-production field has 13 to 150,000 basic seedlings per mu. The basic seedlings per mu in the dry wheat field are 12 to 160,000; the basic seedlings per acre in the late wheat field are 20 to 300,000. It is necessary to vigorously promote the precision and semi-precision sowing techniques, especially the varieties with strong tillering ability, high rate of ear formation and plots with early sowing date, we must pay attention to reduce the amount of sowing. If the sowing date is postponed, it is necessary to increase the amount of broadcast appropriately. Generally, it is broadcasted every day for one day, and the amount of broadcast is increased by 0.25-0.5 kg. Seeding should be carried out with a seeder, requiring accurate seeding, uniform seeding, and uniform depth to ensure seeding quality.
Third, lyrics
The species under the ankle is the key to ensuring the seedlings, the seedlings, and the seedlings. "The wheat harvest every year" is to emphasize the importance of the bottom. The astragalus is sowed or the mouth is not enough, the emergence of the seedlings is slow and not uniform, the tillers are delayed, the tillers are absent, and the seedlings are thin and weak. Therefore, it is necessary to do the next kind. The suitable soil moisture for wheat emergence is 70% to 80% of the field water holding capacity. If the lyrical situation is appropriate during autumn planting, it should be ploughed in time after the harvest of the autumn crops, and planted on the whole land; In the appropriate period, we should master the principle of "we prefer to broadcast at the right time, but also to build a foothold".
Fourth, the depth of the broadcast
The suitable sowing depth of wheat varies with climatic conditions, soil quality, and lyric conditions. When the climate is dry, the soil is soft, and the sensation is insufficient, the sowing can be appropriately deeper. Generally, the sowing depth is 4-5 cm; the soil is sticky and the lyrical plot can be slightly shallower, generally 3 to 4 cm deep. It is appropriate. After the broadcast, pay attention to timely suppression, bridge the soil, and solidify the soil, so that the seeds and soil are closely combined, which is conducive to lifting the stalks, early emergence, and competition. Pour the land of the head water, so that the planting should be shallower. After the soil is dry, it should be drained in time to break the knot and facilitate the emergence of seedlings.
1. Features of tape measure
Gift rulers are used for advertising and promotion. They are divided into Steel tape (steel tape) and leather tape (PVC plastic fiber tape). They are usually cute and compact. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.
2, the characteristics of the tape measure
(1) The tape measure is too deformed and will not fail
Why didn't it fail? The spring in the tape measure is very long, and its range from completely relaxed to fully tightened is very large. The entire stroke of the tape measure includes it, and there is a margin at both ends, so the tape measure will not fail.
(2) Pull one meter long and pull two meters long, there is no difference in tension
The spring of the tape measure is very thin, and the amount of deformation when it is tightened is also small, so the reaction force is very small, and the force change is not felt when the rule is pulled.
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