一般來說，在進行種子千粒重測定的時候
，用到的種子粒數會比較多，如果采取人工數粒的話，會嚴重影響工作效率，因此需要真空數粒儀來進行種子數粒。

千(qian)粒(li)重(zhong)是(shi)以(yi)克(ke)表(biao)示(shi)的(de)一(yi)千(qian)粒(li)種(zhong)子(zi)的(de)重(zhong)量(liang)，它(ta)是(shi)體(ti)現(xian)種(zhong)子(zi)大(da)小(xiao)與(yu)飽(bao)滿(man)程(cheng)度(du)的(de)一(yi)項(xiang)指(zhi)標(biao)，是(shi)檢(jian)驗(yan)種(zhong)子(zi)質(zhi)量(liang)和(he)作(zuo)物(wu)考(kao)種(zhong)的(de)內(nei)容(rong)，也(ye)是(shi)田(tian)間(jian)預(yu)測(ce)產(chan)量(liang)時(shi)的(de)重(zhong)要(yao)依(yi)據(ju)。一(yi)般(ban)測(ce)定(ding)小(xiao)粒(li)種(zhong)子(zi)千(qian)粒(li)重(zhong)時(shi)是(shi)隨(sui)機(ji)數(shu)出(chu)三(san)個(ge)一(yi)千(qian)粒(li)種(zhong)子(zi)
，分(fen)別(bie)稱(cheng)重(zhong)，求(qiu)其(qi)平(ping)均(jun)值(zhi)。大(da)粒(li)種(zhong)子(zi)可(ke)取(qu)三(san)個(ge)一(yi)百(bai)粒(li)分(fen)別(bie)稱(cheng)重(zhong)，取(qu)其(qi)平(ping)均(jun)值(zhi)
，稱(cheng)百(bai)粒(li)重(zhong)。

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