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臺風吹倒的玉米如何機械化收割能減小損失?黑龍江省發布技術指導意見
2020-09-10
10:09:58
來源:農機網整理發布 閱讀量:42787
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【農機網 熱點關注】 由于近期東北部分地區連續多次遭遇臺風暴雨等惡劣天氣侵襲,致使玉米嚴重倒伏,為有效應對臺風災害,科學開展秋季收獲,努力減少倒伏玉米收獲損失,9月8日,黑龍江省農業機械化技術推廣總站發布《倒伏玉米機械化收獲減損技術指導意見》,供各地結合本地實際參照執行。
《指導意見》從機車調試、改裝機具、收獲時間、作業方式、收儲烘干等幾方面進行了指導,以期科學開展秋季收獲,努力減少臺風帶來的損失。
一、抓緊機車調試,務求良好工況
各地農機化部門要立即行動起來,組織農機合作社、農機大戶按照玉米抗倒伏收獲的要求,做好試運轉,先局部后整體,認真檢查行走、轉向、割臺、輸送、剝皮、脫粒、清選、卸糧等機構的運轉、傳動、操作、調整等情況,檢查升降系統是否工作正常,檢查有無異常響聲和漏油、漏水情況;割臺、機架等部件有無變形等,發現問題逐一解決,使機具達到工作狀態,并做好易換零配件的儲備,預防和減少作業故障的發生,提高收獲質量和效率。
有條件的地區要準備好履帶式玉米
收獲機,本地抗災能力不足的要及時溝通協調機車跨區作業服務。
二、改進改裝機具,提高收獲效能
各地農機部門要迅速組織技術力量,動員農機維修企業,廣泛借鑒各地經驗,視情對現有收獲機進行合理加裝、改進和調整,減少糧食收獲作業損失,主要有以下幾種改進方式:
1.加長扶禾裝置。在收獲機割臺上加長分禾尖或加裝倒伏扶禾裝置,增加扶禾作業行程,適當降低割臺小傾角度數,使倒伏玉米更加平順進入割臺。
2.加裝強制喂入裝置。通過加裝輔助撥禾輪或螺旋扶倒器,增加作物強制喂入功能,使玉米秸稈喂入割臺前盡量扶正,有條件的地區也可加裝動力撓爪,進一步提高倒伏玉米歸集喂入質量。
3.改裝內部功能結構。一是視情將鐵膠混合剝皮輥改裝為全膠剝皮輥,提高扒皮效果,防止鐵輥溝槽粘連泥土降低作業效果;二是將排雜輥改為浮動狀態,加裝強力風機,將喂入割臺的玉米整株有效排出;三是調整脫粒滾筒轉速和凹板間隙,避免過度揉搓,防止莖葉中的水分進入玉米籽粒。
三、選準收獲時間,適時早收搶收
當前,要首先加大田中積水排泄力度,保證玉米后續生長,為機械進地收獲創造條件。其次,根據天氣情況、地塊特點、品種特性和栽培條件,合理安排收獲順序適時搶收,盡量選擇露水消退后進行收獲,減少莖葉中的水分進入籽粒,防止霉變發生。對于倒伏嚴重且發生莖折或根折的玉米,符合青貯條件的可及早進行青貯或直接粉碎還田。
第二年準備實施保護性耕作地塊,收獲、運輸等車輛進地作業時要求不破壞原壟形,減少進地次數,確保玉米原壟免耕播種質量。
四、選擇作業方式,確保收獲質量
1.確定收獲方向。對于玉米倒伏方向與種植行垂直的玉米宜采取對行收割方式;對于倒伏方向與種植行平行的作物宜采取逆向對行收割方式,有利于強制扶起倒伏玉米,減少掉棒及籽粒損失。
2.降低作業速度。收獲時通過降檔加油門方式勻速作業,使喂入速度與脫粒速度相協調,防止倒伏后玉米籽粒濕度較高和果穗粘連泥土等原因造成的堵塞;也可將收獲機清選風量盡可能調大,進而使收獲的籽粒清潔度更高,降低籽粒水分,減少玉米霉變的可能性。
3.降低割臺高度。視玉米倒伏情況,調整收獲機分禾器尖與地面的距離,盡量扶起倒伏玉米,割臺要及時清理,防止秸稈和泥土在割臺堆積,影響作業效果和效率。
4.選用還田裝置。有人工撿拾條件的地區,收獲作業時可斷開秸稈還田裝置動力或將該裝置提升至高位置,防止漏收玉米果穗被打碎,方便人工撿拾,減少收獲損失。需要秸稈還田的可利用秸稈粉碎還田機進行再次作業。
5.加裝履帶裝置。有積水或土壤濕度大的地塊,建議采用履帶式收獲機或收獲機加裝半履帶進行搶收作業。
五、科學開展收儲,抓好顆粒歸倉
一是采取果穗收獲方式,要及時對收集的果穗進行清選,剔除霉變,果穗應離地儲存,及時通風降水,有條件的可適時脫粒、烘干、倉儲,保證糧食質量;二是采取籽粒收獲方式時,應及時采用連續式
糧食烘干機進行烘干,水分降低后倉儲,以防霉變損失。
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