冠亞(ya)水分儀資(zi)訊(xun):降低(di)種(zhong)子水分zui有效的措施是通風。通風可分兩種(zhong):
1、自然通風根據倉內外溫、濕度,合理的啟閉門窗,利用空氣對流通風,其效果取決于內外溫差、風速、堆裝方式、堆垛大小、種子的孔隙度等等。當外溫、外濕低于倉內,風速大,堆垛小,孔隙度大時通風效果好,否則效果差。自然通風只要有溫差和風速就會空氣流通,為此,必須選擇合理的通風時間。通風前測定倉內外的溫度和相對濕度,凡倉外的溫、濕度均低于倉內時,可通風;倉外的溫、濕度一項與倉內相同,另一項低于倉內時也可以通風;倉外溫度低于倉內,而相對濕度略高于倉內時,通過空氣進入倉內后相對濕度明顯低于原來倉內的濕度,可通風。
2、機械通風(feng)(feng)將外界干冷空氣(qi)吹入(ru)種(zhong)(zhong)(zhong)堆(dui)(dui)或將種(zhong)(zhong)(zhong)堆(dui)(dui)內(nei)(nei)的濕(shi)熱空氣(qi)吸(xi)出(chu)。機械通風(feng)(feng),一種(zhong)(zhong)(zhong)是(shi)壓入(ru)式(吹風(feng)(feng)),把風(feng)(feng)機的出(chu)風(feng)(feng)口(kou)(kou)和(he)風(feng)(feng)管(guan)相(xiang)連,使外界冷空氣(qi)壓入(ru)種(zhong)(zhong)(zhong)堆(dui)(dui),種(zhong)(zhong)(zhong)堆(dui)(dui)內(nei)(nei)的濕(shi)熱空氣(qi)由種(zhong)(zhong)(zhong)面散發;另一種(zhong)(zhong)(zhong)是(shi)吸(xi)出(chu)式,把風(feng)(feng)機的通風(feng)(feng)口(kou)(kou)和(he)風(feng)(feng)管(guan)相(xiang)連,將種(zhong)(zhong)(zhong)堆(dui)(dui)內(nei)(nei)濕(shi)熱空氣(qi)從風(feng)(feng)管(guan)內(nei)(nei)吸(xi)出(chu),達到(dao)溫(wen)、濕(shi)度適宜。