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2021年秋收農(nóng)作物秸稈還田指導(dǎo)意見

2021-09-30 09:08:04 來源：農(nóng)業(yè)農(nóng)村部網(wǎng)站 閱讀量：14881 評論

導(dǎo)讀： 秋收期間，秸稈產(chǎn)生量大、時間集中、還田面廣，為做好糧食主產(chǎn)區(qū)主要農(nóng)作物秸稈的高質(zhì)量還田和還田地塊的科學(xué)管理，提升耕地地力，確保下茬作物穩(wěn)產(chǎn)豐收，提出如下指導(dǎo)意見。

　　【農(nóng)機網(wǎng) 科技創(chuàng)新】 秋收期間，秸稈產(chǎn)生量大、時間集中、還田面廣，為做好糧食主產(chǎn)區(qū)主要農(nóng)作物秸稈的高質(zhì)量還田和還田地塊的科學(xué)管理，提升耕地地力，確保下茬作物穩(wěn)產(chǎn)豐收，提出如下指導(dǎo)意見。
 
　　一、東北地區(qū)
 
　　(一)科學(xué)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(yīng)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(nóng)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(zhì)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(chǔ)的地塊進行免耕播種，須配合苗期深松作業(yè)。
 
　　(二)科學(xué)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(yīng)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(zhì)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(yīng)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(jié)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(yīng)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(yīng)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(zhì)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(zhì)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(guān)注返青期、拔節(jié)孕穗期、灌漿期等關(guān)鍵生育期的土壤墑情，根據(jù)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(nèi)連續(xù)降雨或干旱情況時有發(fā)生，在水稻收割時，應(yīng)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(yīng)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(zhì)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(zhuǎn)滅茬旋耕機、或鏵式犁、或犁旋一體復(fù)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(yīng)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(jù)播種期溫度、墑情、秸稈還田整地質(zhì)量等影響因素適當調(diào)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(yīng)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(xué)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(yīng)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(zhì)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(jié)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(diào)節(jié)碳氮比加速秸稈腐解，后期可根據(jù)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(yīng)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?qū)捳蟹N植水稻的可將秸稈均勻覆蓋于廂面或?qū)捫兄小?br /> 
　　有灌溉排水條件的田塊，農(nóng)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(yīng)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(xué)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(yīng)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(zhì)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(diào)節(jié)碳氮比加速秸稈腐解，后期可根據(jù)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(yīng)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)。
 
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