機械大小(xiao)的選擇

水稻聯合收(shou)(shou)(shou)割(ge)(ge)機(ji)的功(gong)率(lv)一般為9--107kW。因(yin)此，所選機(ji)型(xing)(xing)大小(xiao)(xiao)要與田(tian)(tian)(tian)(tian)塊(kuai)大小(xiao)(xiao)及集中(zhong)連(lian)片(pian)的狀況相適應。如(ru)(ru)果田(tian)(tian)(tian)(tian)塊(kuai)平(ping)整，田(tian)(tian)(tian)(tian)塊(kuai)較(jiao)大，高差小(xiao)(xiao)，應選擇較(jiao)大機(ji)型(xing)(xing)；如(ru)(ru)果田(tian)(tian)(tian)(tian)塊(kuai)較(jiao)小(xiao)(xiao)，而且分(fen)(fen)散，應選擇小(xiao)(xiao)型(xing)(xing)收(shou)(shou)(shou)割(ge)(ge)機(ji)。如(ru)(ru)果小(xiao)(xiao)田(tian)(tian)(tian)(tian)塊(kuai)選用大型(xing)(xing)收(shou)(shou)(shou)割(ge)(ge)機(ji)，收(shou)(shou)(shou)割(ge)(ge)機(ji)的效率(lv)不能(neng)充分(fen)(fen)發揮；大田(tian)(tian)(tian)(tian)塊(kuai)選用小(xiao)(xiao)型(xing)(xing)收(shou)(shou)(shou)割(ge)(ge)機(ji)，則生產率(lv)低，不能(neng)滿(man)足農忙季節(jie)快速(su)收(shou)(shou)(shou)獲的要求(qiu)。

喂入方式的選擇

按喂入(ru)方式不同(tong)，水稻聯合收割機(ji)分為半喂入(ru)與全喂入(ru)機(ji)型(xing)(xing)。兩者的根本區別在(zai)于對(dui)水稻秸(jie)稈的處(chu)理(li)不同(tong)。半喂入(ru)機(ji)型(xing)(xing)秸(jie)稈輸送裝置比(bi)較(jiao)復雜(za)，價格(ge)高，故障較(jiao)多。全喂入(ru)機(ji)型(xing)(xing)結構簡(jian)單，可靠性好，故障較(jiao)少，價格(ge)相對(dui)較(jiao)低(di)。

行走裝置的選擇

對(dui)沙(sha)(sha)性(xing)、半(ban)沙(sha)(sha)性(xing)土(tu)(tu)壤，承(cheng)載力較強，可(ke)(ke)選用(yong)輪(lun)式行(xing)走裝置的收獲(huo)機(ji)(ji)械(xie)。對(dui)于粘(zhan)(zhan)性(xing)、半(ban)粘(zhan)(zhan)性(xing)土(tu)(tu)壤，以選用(yong)履帶式行(xing)走裝置的收獲(huo)機(ji)(ji)型(xing)為(wei)宜(yi)。另外，輪(lun)式行(xing)走裝置的背負式收獲(huo)機(ji)(ji)械(xie)，農(nong)(nong)(nong)閑(xian)時(shi)(shi)可(ke)(ke)卸(xie)下收獲(huo)機(ji)(ji)具，拖拉機(ji)(ji)可(ke)(ke)從事(shi)運輸(shu)作(zuo)(zuo)業(ye)；農(nong)(nong)(nong)忙時(shi)(shi)，還可(ke)(ke)配(pei)犁、耙或(huo)旋(xuan)耕機(ji)(ji)進行(xing)農(nong)(nong)(nong)田(tian)作(zuo)(zuo)業(ye)。而履帶式行(xing)走裝置的收獲(huo)機(ji)(ji)械(xie)，是專用(yong)的收獲(huo)機(ji)(ji)械(xie)，利用(yong)率低。在選購時(shi)(shi)，購機(ji)(ji)者也應仔(zi)細考慮。

收獲方式的選擇

水(shui)稻聯合收割(ge)機集(ji)收割(ge)、脫(tuo)粒(li)及清(qing)選(xuan)(xuan)等(deng)數道(dao)工序(xu)一次完(wan)成(cheng)，機械化程度高(gao)，割(ge)后的籽粒(li)基本清(qing)潔干(gan)凈(jing)，一般(ban)應優先考慮。有的地區受經濟(ji)條件的限(xian)制和(he)傳(chuan)統收獲方式(shi)的影響，長期(qi)以來(lai)習(xi)慣(guan)先收割(ge)，曬干(gan)后再進行脫(tuo)粒(li)，可考慮選(xuan)(xuan)擇水(shui)稻割(ge)曬機。