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2021年秋收農作物秸稈還田指導意見

2021-09-30 09:08:04 來源:農業(yè)農村部網站 閱讀量:14905 評論

導讀: 秋收期間,秸稈產生量大、時間集中、還田面廣,為做好糧食主產區(qū)主要農作物秸稈的高質量還田和還田地塊的科學管理,提升耕地地力,確保下茬作物穩(wěn)產豐收,提出如下指導意見。

  【農機網 科技創(chuàng)新】 秋收期間,秸稈產生量大、時間集中、還田面廣,為做好糧食主產區(qū)主要農作物秸稈的高質量還田和還田地塊的科學管理,提升耕地地力,確保下茬作物穩(wěn)產豐收,提出如下指導意見。
 
  一、東北地區(qū)
 
  (一)科學及時做好玉米秸稈還田
 
  1. 玉米連作和玉米大豆輪作是東北旱作區(qū)的主要種植模式,在玉米成熟后及時收獲并粉碎秸稈還田,為秋季耕整地作業(yè)搶出時間。病蟲害較嚴重的地塊,秸稈應收集離田處置。一般情況下,秸稈粉碎的長度越小,蟲害的發(fā)生現(xiàn)象越小。
 
  2. 為節(jié)約成本、不誤農時,玉米聯(lián)合收割機需加裝秸稈粉碎拋撒還田裝置,收獲玉米的同時將秸稈粉碎,均勻地拋撒在地表。秸稈粉碎作業(yè)質量要求:秸稈留茬高度≤ 10 cm,切碎長度≤ 10 cm、成撕裂狀,秸稈粉碎長度及留茬高度不合格率≤ 10%,拋撒不均勻率≤ 20%。
 
  3. 玉米秸稈覆蓋條帶耕作、翻埋還田和碎混還田的地塊在土壤封凍前完成整地作業(yè),免耕地塊留茬覆蓋越冬。
 
  玉米秸稈覆蓋條帶耕作:秸稈粉碎拋撒后,采用條帶耕作機將秸稈進行歸行處理,使播種帶地表裸露、在封凍前完成播種帶的表層耕作,翌年春季精量播種;或采用秸稈歸行機將秸稈進行歸行處理,翌年春季免耕播種。
 
  玉米秸稈翻埋還田:秸稈粉碎均勻拋撒地表,在封凍前完成翻地、耙地等作業(yè),翻耕深度25 cm以上,壟作地塊一并完成起壟,鎮(zhèn)壓后越冬。
 
  玉米秸稈碎混還田:秸稈粉碎拋撒后,在封凍前進行深松耙地或深旋耕,耙(旋)深15 cm以上,壟作地塊一并完成起壟,鎮(zhèn)壓后越冬。
 
  4.未有深翻和深松基礎的地塊進行免耕播種,須配合苗期深松作業(yè)。
 
  (二)科學及時做好水稻秸稈還田
 
  1. 東北地區(qū)水稻主要采取連作的種植模式,病蟲害較嚴重的地塊,秸稈應收集離田處置。
 
  2. 秸稈還田地塊,水稻聯(lián)合收割機需加裝秸稈粉碎拋撒還田裝置,收獲的同時粉碎秸稈。秸稈粉碎作業(yè)質量要求:秸稈留茬高度≤ 10 cm,切碎長度≤ 10 cm,秸稈粉碎長度及留茬高度不合格率≤ 10%,均勻地拋撒在地表。
 
  3. 收獲前稻田應及時排干水,秋季稻田土壤水分適合機車下田作業(yè)的地塊,在封凍前完成整地作業(yè),可結合秋整地每畝施尿素3-4 kg;田間水分多不適合整地的地塊,待翌年春季整地。
 
  水稻秸稈翻埋還田:秋季秸稈粉碎后及時翻地,立垡越冬;翻耕深度18-25 cm,實現(xiàn)秸稈全部深埋還田,漏耕率≤ 2.5%,重耕率≤ 5%,水田池邊翻地整齊。
 
  水稻秸稈旋耕還田:秋季秸稈粉碎后及時旋耕整地,旋耕深度14-16 cm,實現(xiàn)秸稈全部深埋還田,漏耕率≤ 2.5%,重耕率≤ 5%,水田池邊旋耕整齊。
 
  二、黃淮海地區(qū)
 
  1. 黃淮海地區(qū)玉米多為活稈成熟,應在玉米秸稈水分含量高、易粉碎時及早粉碎還田,避免其從土壤中繼續(xù)吸收養(yǎng)分,造成土壤養(yǎng)分浪費。病蟲害較嚴重的地塊,秸稈應收集離田處置。
 
  2. 選用帶有粉碎拋撒裝置的聯(lián)合收割機或秸稈粉碎還田機。秸稈粉碎作業(yè)質量要求:秸稈留茬高度≤ 5 cm,切碎長度≤ 8 cm,秸稈粉碎長度及留茬高度不合格率≤ 10%,拋撒不均勻率≤ 20%,漏切率≤ 1.5 %。機械在地頭拐彎時易造成秸稈聚堆,整地前要均勻散開。
 
  3. 后茬種植小麥時,在完成粉碎、施肥作業(yè)后,可采用深旋耕、深耕翻壓或隔兩年深翻一次的輪耕方式使秸稈還田整地;小麥播種后要及時鎮(zhèn)壓。
 
  玉米秸稈深旋耕還田:秸稈粉碎拋撒后,進行深旋耕1-2遍,旋耕深度15-18 cm,使秸稈均勻地分布在表層土壤中;深旋耕后及時鎮(zhèn)壓 ,有利于小麥播種深度一致,確保苗齊苗壯。
 
  玉米秸稈深耕翻壓還田:秸稈粉碎拋撒后,進行翻地、耙地等作業(yè),耕深要求25 cm以上,使秸稈完全被掩埋在耕層中;深耕后及時耙實鎮(zhèn)壓,達到地平土碎,有利于秸稈腐解和小麥出苗、生長。
 
  玉米秸稈輪耕還田:秸稈粉碎拋撒后,以3年為一周期,第1年采用深耕翻壓還田方式,耕深25 cm以上;第2和3年采用旋耕還田方式,耕深15 cm左右。輪耕還田方式在確保秸稈還田質量前提下,可有效降低機械作業(yè)成本和能耗。
 
  4. 整地后如土壤墑情不好,須澆足底墑水再播種,為小麥出苗提供充足的水分,塌實土壤,保墑防寒,利于秸稈腐解。冬小麥生長季重點關注返青期、拔節(jié)孕穗期、灌漿期等關鍵生育期的土壤墑情,根據實際情況進行灌溉,建議冬前灌水,利于小麥安全越冬。
 
  三、長江中下游地區(qū)
 
  1. 秋收期間區(qū)域內連續(xù)降雨或干旱情況時有發(fā)生,在水稻收割時,應選用配備秸稈切碎勻鋪裝置的聯(lián)合收割機完成秸稈的粉碎、拋灑。病蟲害較嚴重的地塊,秸稈應收集離田處置。需要秸稈移除的重金屬污染管控區(qū),秸稈另行按離田方法處理。
 
  2. 選用帶有粉碎拋撒裝置的聯(lián)合收割機或秸稈粉碎還田機。秸稈粉碎作業(yè)質量要求,秸稈留茬高度≤ 15 cm,切碎長度≤ 10 cm,秸稈粉碎長度及留茬高度不合格率≤ 10%,均勻地拋撒在地表。另可選用75馬力以上拖拉機,配置撒肥機施用基肥,配置反轉滅茬旋耕機、或鏵式犁、或犁旋一體復式機進行水稻秸稈還田作業(yè),配置播種、開溝機具,進行油菜或小麥播種、鎮(zhèn)壓和開溝,優(yōu)選帶旋耕滅茬、開溝起壟、施肥播種等多種功能的一體機進行全過程一次性作業(yè)。
 
  3. 后茬作物為油菜的,應基于秸稈還田腐解規(guī)律和養(yǎng)分釋放特征,氮肥適當前移,將80%左右的氮肥用于基肥。稻田油菜免耕飛播田塊,建議水稻秸稈留茬高度40-50 cm,減少稻草覆蓋厚度以利油菜出苗,秸稈切碎長度≤ 10 cm,均勻覆蓋還田。
 
  4. 后茬作物為小麥的,根據播種期溫度、墑情、秸稈還田整地質量等影響因素適當調節(jié)播種量,播種時隨種隨壓,未帶鎮(zhèn)壓裝置或鎮(zhèn)壓不實的田塊要在小麥播種后及時鎮(zhèn)壓,確保種(根)土密接,培育壯苗。應基于秸稈還田腐解規(guī)律和養(yǎng)分釋放特征,氮肥適當前移,將70%左右的氮肥用于基肥。
 
  5. 水稻收獲后不接茬油菜或小麥的,或者后茬作物為免耕飛播紫云英等綠肥的,可選用配備秸稈切碎勻鋪裝置的聯(lián)合收割機進行高留茬收割水稻,同時將秸稈切碎后均勻鋪撒作業(yè)。
 
  四、西南地區(qū)
 
  (一)科學及時做好水稻秸稈還田
 
  1. 在平原和高原平壩區(qū),主要進行水稻秸稈粉碎覆蓋和粉碎翻埋還田。病蟲害較嚴重的地塊,秸稈應收集離田處置。水稻收獲時,采用帶有秸稈切碎拋撒裝置的聯(lián)合收割機進行收獲,同時完成秸稈粉碎和均勻拋撒。秸稈粉碎作業(yè)質量要求:秸稈留茬高度≤15 cm,切碎長度≤ 10 cm,秸稈粉碎長度及留茬高度不合格率≤ 10 %,拋撒不均勻率≤ 20%,均勻地拋撒在地表。
 
  水稻秸稈粉碎覆蓋還田:要求秸稈拋撒均勻,田塊落干無明水,避免秸稈覆蓋后隨水漂浮。
 
  水稻秸稈粉碎翻埋還田:需在下季作物播種時,結合整地通過翻旋機械進行滅茬、翻旋和秸稈翻埋還田一體化作業(yè)。耕整時用機械進行翻壓,將秸稈與表層土壤充分混勻,翻壓深度在8-10 cm;旋耕整地時每畝施用尿素5-8 kg,調節(jié)碳氮比加速秸稈腐解,后期可根據作物長勢適量減少氮肥用量。
 
  2. 在丘陵及山地區(qū)域,主要進行水稻秸稈整株覆蓋還田。病蟲害較嚴重的地塊,秸稈應收集離田處置。水稻人工收獲時,秸稈多采用整株覆蓋還田,將秸稈均勻覆蓋在稻樁行間,開廂或寬窄行種植水稻的可將秸稈均勻覆蓋于廂面或寬行中。
 
  有灌溉排水條件的田塊,農作物秸稈與土壤混勻后,可灌水浸泡田塊2-3天,加速秸稈在土壤中的水分吸收與腐解;無灌溉條件的田塊,應在秸稈翻壓與土壤混勻后及時整地,減少水分蒸發(fā)。采用秸稈覆蓋還田免耕的保護性耕作,宜每隔2-3年深耕深松一次。
 
  (二)科學及時做好玉米秸稈還田
 
  1. 在平原和高原平壩區(qū),玉米單作或輪作(玉米-油菜、玉米-小麥等模式)且機械化程度較高的情況下,主要進行玉米秸稈粉碎翻埋還田。病蟲害較嚴重的地塊,秸稈應收集離田處置。玉米收獲時,采用帶有秸稈切碎拋撒裝置的聯(lián)合收割機進行收獲,同時完成秸稈粉碎和均勻拋撒。秸稈粉碎作業(yè)質量要求:秸稈留茬高度≤ 10 cm,切碎長度≤ 10 cm,秸稈粉碎長度及留茬高度不合格率≤ 10%,拋撒不均勻率≤ 20%,均勻地拋撒在地表。玉米秸稈最佳粉碎期是在玉米成熟后,秸稈呈綠色,此時秸稈本身含糖分、水分大,易被粉碎,可加快腐解,增加土壤養(yǎng)分。
 
  待下季作物播種時,采用耕作機械進行翻壓,將秸稈與表層土壤充分混勻,翻壓深度在15-20 cm;旋耕整地時每畝施用尿素5-8 kg,調節(jié)碳氮比加速秸稈腐解,后期可根據作物長勢適量減少氮肥用量。
 
  2. 在丘陵和山地區(qū)域,玉米間套作(小麥-玉米//大豆、小麥-玉米//甘薯或油菜-玉米等模式)或單作的情況下,主要進行玉米秸稈整株條帶覆蓋還田。病蟲害較嚴重的地塊,秸稈應收集離田處置。玉米人工收獲時,將玉米秸稈按照歸行化方式處理,均勻方向一致順鋪在玉米原位種植帶或者下季空閑行上,不影響下季作物播種作業(yè)。
 
  農業(yè)農村部秸稈綜合利用技術專家組
 
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