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2022年“三秋”機械化生產技術指導意見

2022-09-20 09:56:58 來源:農業機械化管理司 閱讀量:16226 評論

  【農機網 熱點關注】當前,秋糧生產進入關鍵期,為切實做好“三秋”機械化生產工作,確保顆粒歸倉、應種盡種,針對機收減損、“雙晚”技術、倒伏作物收獲、過濕地塊作業等情況,特制定2022年“三秋”機械化生產技術指導意見,供各地參考。
 
  一、機收減損技術
 
  (一)選擇適宜收獲期
 
  適期收獲可增加粒重、減少損失、提高產量和品質。作業前,應準確判斷確定適收期,過早或過遲收獲會增加損失率和破碎率。如遇自然災害等特殊情況,可適當提前收獲。
 
  (二)選擇適宜收獲方式和機具
 
  收獲水稻時,一般選用全喂入履帶式谷物聯合收割機,優先采用大喂入量機型,提高作業效率和質量;收獲難脫粒品種(脫粒強度大于180g)或倒伏水稻時,可選用半喂入履帶式谷物聯合收割機。收獲玉米時,如籽粒含水率在25%以下,優先選用玉米籽粒聯合收獲機一次性完成摘穗和脫粒作業,宜選用縱軸流機型;如不具備籽粒收獲條件,可選用摘穗型玉米收獲機進行果穗收獲,待果穗籽粒含水率降低或進入冬季果穗結凍后再脫粒。收獲大豆時,優先選用配置撓性割臺的大豆聯合收獲機;如無專用大豆聯合收獲機,可通過調整改造谷物聯合收割機并更換撓性割臺方式實現。
 
  (三)做好機具檢查調試
 
  作業前,依據產品使用說明書對機具進行一次全面檢查與保養,確保機具技術狀態良好;應根據地塊條件(大小、坡度等)、作物條件(品種特性、成熟程度、產量水平、籽粒含水率、秸稈水分含量等)、環境天氣、農藝要求(留茬高度、秸稈粉碎程度等)等對收獲機作業參數進行調整,并進行試收,試收作業距離一般為30—50m。試收后,應按照作業質量標準檢驗作業效果,如作業效果欠佳,應再次對收獲機進行調整和試收檢驗,直至作業質量優于標準,并達到滿意的作業效果。
 
  (四)機收作業注意事項
 
  1.提前規劃行走路線
 
  玉米收獲時,機具行進方向應盡量保證與種植行平行,避免與種植行垂直方向收獲;水稻、大豆收獲作業一般采用向心回轉法。作業前,應提前查看地塊,對地塊中的溝渠、田埂、通道等予以平整,并將水井、墳頭、電桿拉線、樹樁等不明顯障礙進行標記,并據此合理規劃路線,科學避讓。作業時,應根據地塊形狀,依次進行作業;如有必要,可提前開出收割道。
 
  2.合理控制作業速度
 
  應根據機型特點、作物產量、植株密度、自然高度、干濕程度、留茬高度等因素選擇合理的作業速度;當作物密、植株大、產量高、地塊起伏不平、早晚及雨后作物濕度大時,應適當降低作業速度;作業時,一般先低速收獲,然后逐步提高至正常作業速度;嚴禁使用行走檔位進行收獲作業;低速行駛作業時,不能降低發動機轉速。
 
  3.科學規范駕駛操作
 
  作業時,應通過調整作業速度和幅寬實時控制喂入量,使機具在額定負荷下工作,降低夾帶損失,避免發生堵塞故障;應注意幅寬銜接,避免相鄰兩個作業帶之間出現漏收損失。地頭轉彎時,應停止作業,采用倒車法轉彎或兜圈法直角轉彎,直線行駛后再開始作業。應注意地頭、邊角和障礙物附近作物收獲情況,做到應收盡收,減少損失。
 
  (五)及時烘干
 
  收獲后的水稻稻谷、玉米籽粒含水率如未達到儲藏要求,應及時烘干。烘干作業應遵循就近原則,提前聯系烘干地點,統籌安排,合理拉運,隨收隨烘,避免濕糧長期堆放。
 
  水稻宜采用低溫烘干,可選用循環式或連續式烘干機。收獲的玉米籽粒,宜選用連續式烘干機;收獲的玉米果穗,應先離地儲存,通風降水,待籽粒含水率降至25%以下或進入冬季果穗結凍后,再脫粒并烘干。
 
  烘干前,應進行初清,含雜率≤2%,不得有長莖稈、麻袋繩、塑料薄膜等雜物;應測定谷物初始含水率,同一批烘干的谷物水分不均度應≤3%。烘干時,玉米籽粒(不包括制種玉米籽粒)溫度一般不超過50℃,最高不超過55℃,應控制一次降水幅度不大于18%或平均干燥速率不大于2.5%/h,防止玉米裂紋率增大;水稻籽粒溫度一般不超過40℃,最高不超過43℃,應控制干燥速率不大于1.5%/h,防止爆腰率增大。烘干后,谷物色澤氣味應無明顯變化,無熱損傷粒、焦糊粒。
 
  二、“雙晚”機械化配套技術
 
  “雙晚”是指小麥、玉米一年兩熟區玉米適期晚收、小麥適期晚播技術模式,可有效利用光、熱、水、氣等自然資源,增加玉米粒重,避免小麥冬前旺長,實現周年高效高產。
 
  (一)玉米晚收機械化配套技術
 
  玉米晚收,灌漿更充分,成熟度更佳,籽粒含水率降低,果穗籽粒堅實,有利于降低機收損失率,收獲機一般不需要過多調整。如采用果穗收獲方式,玉米苞葉(俗稱“玉米皮”)含水率降低,與剝皮輥摩擦力減小,有利于減少果穗損傷(俗稱“啃屁股”現象),提高剝凈率,降低損失率;作業時應注意調整壓送器與剝皮輥間距,并適當調整每對剝皮輥之間的壓緊度。如采用籽粒收獲方式,“晚收”可緩解黃淮海地區收獲時籽粒含水率過高問題,有利于提高脫凈率、降低籽粒破碎率和損失率;作業時,應注意調節脫粒滾筒轉速和脫粒間隙。
 
  此外,玉米晚收,植株含水量降低,秸稈硬度降低、韌性增強,植株倒伏風險增大,應注意加強防范。如已發生倒伏,參照倒伏玉米收獲技術開展作業。玉米植株秸稈韌性增強,機械化秸稈還田作業難度增加,機收作業時,應注意秸稈還田質量,如不達標,應降低收獲作業速度,或收獲后進行二次秸稈粉碎還田作業,為耕整地環節和小麥播種環節創造良好條件。
 
  (二)小麥晚播機械化配套技術
 
  為保證晚播小麥形成足夠的群體,可根據當地光熱資源、品種特性、栽培技術等條件適當增加單位面積播種量。播種作業時,根據不同機型,可通過多檔變速箱檔位手柄調整排種軸至合適轉速方式,或通過增加排種盒外槽輪工作長度方式(松開種箱調節器鎖緊螺母,轉動手柄拉動芯軸,調整播種槽床長度)達到所需播種量;必要時,可通過更換排種槽輪進行調整。
 
  為保證晚播小麥養分需求,可按照與土壤地力和目標產量相匹配的原則適當增加單位面積施肥量。播種機排肥裝置結構一般與播種裝置結構差異不大,可根據不同機型,參照播種量調整方式達到所需施肥量。
 
  調整后應進行試播,確保作業質量達標。作業時,應下種均勻,深淺一致,不漏播,不重播;播后應及時鎮壓,確保苗全、苗勻、苗壯。
 
  三、倒伏作物收獲技術
 
  (一)收獲倒伏水稻
 
  1.選擇適用機具
 
  收獲倒伏水稻時,半喂入谷物聯合收割機作業效果一般優于全喂入谷物聯合收割機;如嚴重倒伏且倒伏方向一致,優先選用半喂入機型;如倒伏不嚴重且倒伏方向交錯,優先選用全喂入機型。選用全喂入機型收獲倒伏角大于60度水稻時,應加裝“伏倒器”和“防倒伏彈齒”裝置,并調整撥禾輪與割刀的相對位置,調整彈齒角度后傾,將割臺降至適宜高度。
 
  2.作業注意事項
 
  倒伏角小于45度時,對收獲作業影響有限,一般不進行特殊處理。倒伏角大于45度時,如選用半喂入機型,應采用順向收獲或側向收獲方式;如選用全喂入機型,應采用逆向收獲或側向收獲方式。作業時,應降低作業速度,減少作業幅寬;應將檔位保持低速檔,采用最大油門或中大油門;應根據作物情況實時調整撥禾輪高度和速度;應經常檢查作業質量,注意觀察凹板篩和清選篩,根據收獲效果及時調整機具參數;應及時清除割刀和喂入筒入口處堆積的泥土和秸稈,防止堵塞。
 
  (二)收獲倒伏玉米
 
  1.選擇適用機具
 
  收獲倒伏玉米時,優先選用割臺長度長、傾角小、分禾器尖能夠貼地作業的高性能玉米收獲機;也可在普通玉米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,并適當減小割臺傾角。收獲嚴重倒伏(倒伏角大于60度)玉米時,在上述割臺調整改造基礎上,將鐵膠混合剝皮輥更換為全膠剝皮輥,防止鐵輥溝槽粘連泥土降低作業效果;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;必要時,在割臺上加裝輔助撥禾輪或螺旋扶倒器,實現玉米植株強制喂入;玉米籽粒聯合收獲機還應調整脫粒滾筒轉速和凹板間隙,避免過度揉搓,造成高水分籽粒破損。
 
  2.作業注意事項
 
  倒伏角小于45度時,對收獲作業影響有限,一般不進行特殊處理。倒伏角大于45度時,應在對行收獲原則下,采用逆向收獲或側向收獲方式。作業時,應減少機具負荷,通過降檔加油門方式勻速作業,使喂入速度與各系統作業能力相協調,防止倒伏后玉米籽粒濕度較高、果穗粘連泥土和倒伏玉米植株不規則喂入等原因造成的堵塞;應根據倒伏情況,實時調整收獲機分禾器尖與地面的距離,盡量扶起倒伏玉米;應及時清理割臺,防止秸稈和泥土在割臺堆積。為方便機收作業后人工撿拾,應斷開秸稈還田裝置動力或將該裝置提升至最高位置,防止漏收玉米果穗被打碎;如需秸稈粉碎還田,可在收獲作業后進行二次秸稈粉碎還田作業。
 
  (三)收獲倒伏大豆
 
  1.選擇適用機具
 
  收獲倒伏大豆時,應選用配置撓性割臺的大豆聯合收獲機,實現割臺貼地作業。收獲嚴重倒伏(倒伏角大于60度)大豆時,應加裝“伏倒器”和“防倒伏彈齒”裝置。
 
  2.作業注意事項
 
  收獲倒伏大豆時,應盡量降低割臺高度,保證較低位置的大豆能夠進入割臺。倒伏角小于45度時,對收獲作業影響有限,一般不進行特殊處理;倒伏角大于45度時,應采用逆向收獲或側向收獲方式。其他作業注意事項可參照倒伏水稻收獲。
 
  四、過濕地塊機械化作業技術
 
  (一)創造良好地塊條件
 
  機械化作業前,應盡力減少地塊積水量,為機具進田作業創造良好條件。對于田間積水嚴重的地塊,應采用排灌設備及時抽排積水;對于已無法抽排的積水地塊,應疏通溝渠排水,開挖深溝瀝水。
 
  (二)機具的選擇與調整改造
 
  過濕地塊機械化作業時,輪式農業機械易發生陷機,應優先選用履帶式農業機械;如不具備條件,可將輪式農業機械改造為半履帶式農業機械(將驅動輪更換為三角履帶),或加裝一對驅動輪胎,增加接地面積,減少接地壓力。應急搶收過濕地塊玉米時,可通過調整改造履帶式谷物聯合收獲機進行作業,注意調整滾筒轉速、凹版間隙等工作參數,并更換玉米專用割臺或在割臺加裝接穗板。應急搶種小麥時,宜采用多功能復式作業機具或免耕播種機,減少作業環節,避免重復進地破壞土壤;播種機可增加覆土彌合疏松表土裝置。
 
  采用履帶式農業機械作業時,應根據地塊情況對履帶張緊程度進行調整,泥濘地塊適當調緊一些,干燥地塊適當調松,以提高機具通過能力、減少履帶磨損。
 
  (三)作業技術要點
 
  作業前,仔細觀察地塊泥濘程度,針對性地采取作業措施。作業時,應降低作業速度,避免急進、急退;應緩慢轉彎,避免在同一位置多次轉彎調頭;如遇機具打滑、下陷、傾斜等情況,應及時停車處理。收獲作業時,應及時卸糧,盡量減輕整機重量。收獲作業同步開展秸稈還田作業時,應注意觀察秸稈還田作業質量,如不滿足生產需求可適時開展二次秸稈還田作業。小麥播種時,應盡量將前茬作物秸稈離田處理;應堅持播期服從墑情,如實際播種期遲于最晚適宜播期,應根據種植經驗視晚播天數適當加大播量;作業時,應注意機具行走對播種作業質量影響;應適當淺播,行走速度不宜超過5公里/小時。
 
  農業農村部農業機械化管理司
 
  農業農村部農業機械化總站
 
  農業農村部農作物生產全程機械化專家指導組
 
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