Abstract
Traditional millet drilling method has a problem of labor-intensive artificial thinning-out, so a negative-pressure precision millet seed-metering device was designed to realize millet precision dibble seeding. Single factor experiment researches effect of rotational speed and air-chamber vacuum of seed-metering device on its seed-metering passing rate, repeat-sowing rate and leak-sowing rate. By means of orthogonal experiment method, optimal parameters of seed-metering device were defined, which was 20 r/min rotational speed, 4 mm bore diameter, 1.5 KPa air-chamber vacuum and 55 mm air cut valve arc length. The field test result shows that the seed-metering device meets completely standards of “Single-seed (Precise) Seeder Technological Requirements†and agronomic requirements.
Highlights
As the head of grains, millet is nutritious and rich in protein, fat, carbohydrates, crude fiber and trace elements, containing 11.42% average gross protein value
The planting areas for millet in north China occupies 10-15% of the grain-sown area, ranking the third following those for wheat and corn
Millet precise seeding is the crucial process of production
Summary
As the head of grains, millet is nutritious and rich in protein, fat, carbohydrates, crude fiber and trace elements, containing 11.42% average gross protein value. Considering population effect of millet seedling emergence and agronomic requirement, minimizing leakage sowing, combining re-seeding index curve diagram (Fig. 2c), it confirms that when the rotating speed is 20 r/min, the seed-metering device has stable seed metering performance and better seed metering uniformity.
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