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Abstract
In order to solve problems that traditional mechanical wheat seed-metering device has defects such as poor seeding uniformity and consistency, instability and high seed-injuring rate, a kind of pneumatic wheat precision seed-metering device is designed. The seed-metering device with internal and external circular tube grip seeds in vertical slit of the external circular tube by the negative pressure of the internal circular tube. We optimized slit width, rotating speed and negative pressure of the seed-metering device by the orthogonal experiment. In the field, we did contrast experiment through contrasting the existing mechanical seeder for wheat and measured and analyzed seeding uniformity, seedling emergence rate, consistency of each line seeding quantity, stability of total seeding quantity and rate of damaged seeds of the seed-metering device. The experiment data shows its each seed distance variation coefficient increases more 20% than current domestic mechanical wheat seed-metering device and its seeding uniformity gains obvious improvement.
Highlights
Wheat precision seeding technology promotes its output and quality, being significant to stable and high yield (Zheliang et al, 2012; Ruixue et al, 2009)
In USA, Australia, Canada and France it researched and applied pneumatic precision seeding machines, of which air flow first-order distributive central type seed metering system is mostly applied to grain drills, but is not applied in China due to high cost (Zheng, 2007; Sun, 2003)
New type wheat precision seeding seed-metering device with combined suckers developed by China Agricultural University, small type pneumatic wheat precision seeding sample machine developed by Wheat Engineering Research Center in Shandong Province and twin-disk pneumatic precision seeding machine developed by Hui (2003) in Shandong Agricultural University, all of them have some defects and have no products in the market (Liang et al, 2001; Jun et al, 2000; Hui et al, 2002)
Summary
Wheat precision seeding technology promotes its output and quality, being significant to stable and high yield (Zheliang et al, 2012; Ruixue et al, 2009). Wheat field seeding mainly uses mechanical wheat seeder, having high rate of damaged seeds and unstable seeding quantity (Zhao et al, 2005; Hui, 2003; Liu et al, 2011, 2009). Traditional mechanical wheat seed-metering device has poor seeding uniformity and consistency, instability and high seed-injuring rate, which cannot match the wheat precise seeding agronomic requirements.
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