With the reduction of seeds height, the multiple-seeding index increased firstly and then fell, and the missing-seeding index rose gradually. Although a higher seeds height increased the possibility for sucking multiple tubers simultaneously, the tubers amount detached from the nozzle was raised. Because more intense friction and collision happened in tubers are caused by the longer time that the nozzle through the seed pile. Therefore, the multiple-seeding index was not very high. The lower seeds height is, the weaker friction and collision between tubers are. So the multiple-seeding index was risen gradually. When the height was less than 20 cm, the missing-seeding index increased because of the shortened contact time. Also it was found that tubers entrainment between two arms became much more obvious when the seeds height was greater than 20 cm. But the tubers entrained would not be thrown out the seed box, so it does not affect the operational quality. The overall trend is that lower seeds height corresponds to a poor qualified index. Therefore, B1 was a better operating condition.
With the reduction of seeds height, the <br>multiple-seeding index increased firstly and then fell, and <br>the missing-seeding index rose gradually. Although a <br>higher seeds height increased the possibility for sucking <br>multiple tubers simultaneously, the tubers amount <br>detached from the nozzle was raised. Because more <br>intense friction and collision happened in tubers are <br>caused by the longer time that the nozzle through the seed <br>pile. Therefore, the multiple-seeding index was not very <br>high. The lower seeds height is, the weaker friction and <br>collision between tubers are. So the multiple-seeding <br>index was risen gradually. When the height was less <br>than 20 cm, the missing-seeding index increased because <br>of the shortened contact time. Also it was found that <br>tubers entrainment between two arms became much more <br>obvious when the seeds height was greater than 20 cm. <br>But the tubers entrained would not be thrown out the seed <br>box, so it does not affect the operational quality. The <br>overall trend is that lower seeds height corresponds to a <br>poor qualified index. Therefore, B1 was a better <br>operating condition.
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