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2024年東北地區(qū)大豆春播技術(shù)意見

2024-04-17 08:39:38 來源:農(nóng)業(yè)農(nóng)村部 閱讀量:15981 評論

導(dǎo)讀:吉林東部降水量50—100毫米,加之冬季積雪較厚,局地可能出現(xiàn)階段性春澇,影響適時整地春播。

  【農(nóng)機網(wǎng) 地方農(nóng)機】3月以來,東北大部氣溫偏高2—4℃,土壤化凍較快,墑情總體適宜。據(jù)氣象部門預(yù)測,4月東北大部氣溫正常、降水量10—25毫米,利于積雪融化、土壤化凍和整地備播。黑龍江東部、吉林東部降水量50—100毫米,加之冬季積雪較厚,局地可能出現(xiàn)階段性春澇,影響適時整地春播。針對當(dāng)前氣象條件和大豆生產(chǎn)特點,各地要以“五良”融合為核心,適時適墑播種、構(gòu)建高產(chǎn)群體,為大豆大面積單產(chǎn)提升奠定堅實基礎(chǔ)。
 
  一、合理輪作,精細(xì)整地
 
  在優(yōu)化農(nóng)作物種植結(jié)構(gòu)的基礎(chǔ)上,有條件的地區(qū)實行米-米-豆、米-豆、米-豆-麥、米-豆-薯輪作。采取輪作的地塊,要根據(jù)前茬作物種類及用藥情況,防止除草劑藥害發(fā)生。無法避免重茬時,可通過深耕整地、更新品種、種子包衣、合理密植、均衡施肥、加強病蟲害防治等方式減少重茬危害。秋整地起壟地塊,在土壤化凍3—5厘米時,進行頂凌鎮(zhèn)壓,防止跑墑。秋整地未起壟地塊,已完成秸稈翻埋或深松作業(yè)的,可在土壤化凍5—7厘米時開展耢地封墑作業(yè),土壤化凍12—15厘米時采用重耙或重耙與旋耕聯(lián)合作業(yè),再起壟、鎮(zhèn)壓,達到待播狀態(tài)。未進行秋整地的地塊,對于土壤墑情適宜、達到整地標(biāo)準(zhǔn)的,待土壤化凍15—18厘米時,深松、耙、耢、起壟、鎮(zhèn)壓連續(xù)作業(yè),避免跑墑。秸稈覆蓋免耕播種地塊,在播種前進行一次秸稈和根茬粉碎作業(yè),使其均勻分布在壟溝內(nèi)。干旱地塊要少動土,采取少耕或免耕的方式滅茬播種或原壟種。低洼積水地塊要及時排水降漬,確保在土壤宜耕期內(nèi)完成整地作業(yè)。
 
  二、精選良種,種子處理
 
  根據(jù)積溫條件和市場需求選擇優(yōu)質(zhì)高產(chǎn)、抗逆、廣適性強的品種或高油、高蛋白等專用品種,杜絕越區(qū)種植。播前進行種子精選,純度不低于98%、凈度在99%以上、發(fā)芽率在90%以上、含水量不高于13%。針對當(dāng)?shù)刂饕∠x害發(fā)生情況,選擇適宜的種衣劑包衣,可使用以咯菌腈+精甲霜靈為主要成分的大豆種衣劑或?qū)幠厦顾厮畡┓揽卮蠖垢。秽缦x嗪與其他殺蟲劑混用防治根蛆、蠐螬等地下害蟲及孢囊線蟲病。種衣劑和藥劑拌種用量要嚴(yán)格按產(chǎn)品說明書使用。有條件的地塊在臨近播種時用大豆根瘤菌劑拌種,拌后24小時內(nèi)播種,可用微噴設(shè)備將菌液施入種床。
 
  三、高質(zhì)量播種,合理密植
 
  在5—10厘米地溫穩(wěn)定通過8℃時即可播種。除了地溫適宜外,還要結(jié)合土壤水分狀況,做到因地制宜,靈活掌握,確保大豆播在適播期。凡是墑情適宜,地溫達到播種條件的,一定要適時早播、搶播。干旱地塊,可采用適時“搶墑”、深種淺蓋“接墑”和坐(濾)水種“造墑”等技術(shù)播種。條件允許的可原壟免耕種植。春澇地塊,不能濕耕濕種,可在散墑后適時晚播密植,播種時可采取大壟種植,適當(dāng)淺播淺種,并隔天輕鎮(zhèn)壓,促進早出苗。播種要嚴(yán)把質(zhì)量關(guān),做到精細(xì)播種、用種精量、下籽均勻、深淺一致、覆土嚴(yán)密。圍繞增密、保苗,因地制宜選擇大壟密植、壟三栽培、小壟密植等模式,有條件的建議采用大壟密植淺埋滴灌技術(shù)。根據(jù)當(dāng)?shù)胤e溫條件、土壤肥力、降雨量、施肥量和品種特性合理確定播種密度。常規(guī)栽培,黑龍江中南部地區(qū)畝保苗1.5萬—1.6萬株,東部地區(qū)保苗1.6萬—1.8萬株,西北部、北部地區(qū)畝保苗2.2萬—2.5萬株;內(nèi)蒙古東北部極早熟區(qū)畝保苗2.2萬—2.8萬株,東部早熟區(qū)畝保苗1.8萬—2.2萬株,東部中早熟區(qū)畝保苗1.5萬—1.8萬株;吉林東部地區(qū)畝保苗1.6萬—1.7萬株,中部地區(qū)畝保苗1.2萬—1.5萬株,西部地區(qū)畝保苗1.3萬—1.6萬株;遼寧省畝保苗1萬—1.2萬株。密植栽培,平均密度在常規(guī)栽培基礎(chǔ)上增加10%—20%。播種需均勻無斷條,機械壟上播種時應(yīng)對準(zhǔn)壟頂中心,偏差為±3厘米。
 
  四、高效除草,中耕提苗
 
  提倡苗前封閉除草,在土壤溫濕度適宜時,根據(jù)土壤有機質(zhì)含量、土壤墑情和降雨等因素,酌情確定除草劑施用量和施藥時期,可選用異丙甲草胺、乙草胺混配嗪草酮、異噁草松等。苗后除草一般在禾本科雜草3—5葉期、闊葉雜草2—4葉期莖葉噴霧處理,可使用烯草酮、精喹禾靈等。在大豆苗后莖葉除草劑噴施一周后,長勢明顯偏弱或受藥害的,可噴施蕓苔素內(nèi)脂等植物生長調(diào)節(jié)劑輔以氨基酸、腐殖酸水溶肥,促進大豆幼苗生長。中耕是提高苗情質(zhì)量的重要措施。一般進行3次中耕作業(yè)。第一次在大豆出齊苗后及時壟溝深松,間隔10—15天進行第二次中耕,封壟前完成最后一次中耕,可選擇雙桿尺、起壟鏵、擋土板,起到散土、滅草、培土作用。
 
  五、科學(xué)施肥,適時灌溉
 
  測土配方施肥、增施有機肥、微生物菌劑、分層測深施肥相結(jié)合,適當(dāng)降低化肥用量,提高肥料利用率。一般畝施化肥12—18千克,其中氮、磷、鉀比例為1:1.1—1.5:0.5—0.8。底肥分層側(cè)深施,上層施于種下5—7厘米處,肥量占底肥的1/3;下層施于種下10—12厘米處,肥量占底肥的2/3。積溫較低的冷涼地區(qū),適當(dāng)降低下層施肥比例。有條件的地區(qū)推行微生物復(fù)合菌劑+測土配方施肥,有機肥、生物菌肥與化肥配合使用。有滴灌條件的地塊,播種后及時滴出苗水1次,開花至結(jié)莢期根據(jù)土壤墑情滴水3次,每次畝灌水量20—25立方。干旱地塊,灌水間隔天數(shù)根據(jù)天氣、植株長相、土壤質(zhì)地與含水量確定,一般間隔7—10天。不具備滴灌條件的地塊,視干旱情況可在大豆分枝期、花莢期、鼓粒期進行適時補充灌溉,一般灌水量為分枝至開花期30毫米,開花至結(jié)莢期30—40毫米,結(jié)莢鼓粒期30—35毫米。
 
  六、病蟲防控,一噴多促
 
  加強監(jiān)測預(yù)報,農(nóng)業(yè)防治和化學(xué)防治相結(jié)合,推廣高效、低毒、低殘留藥劑,以及對癥適時適量用藥+科學(xué)輪換用藥等綠色防控技術(shù),減少農(nóng)藥施用次數(shù),降低農(nóng)藥使用強度,提高農(nóng)藥利用率和防控效果。大豆孢囊線蟲病采用合理輪作、選用抗病品種、種子包衣、藥劑拌種、增施有機肥等綜合措施防治;大豆根腐病采用種子包衣、淺播(播深≤5厘米)、合理密植等措施防治;大豆菌核病發(fā)生時及時拔除中心病株,帶出田外銷毀,或選用咪鮮胺、菌核凈等藥劑田間噴霧防治;大豆蚜蟲可選擇吡蟲啉、抗蚜威等藥劑防治;紅蜘蛛可選擇毒死蜱、阿維菌素、甲維鹽等藥劑噴霧防治;食心蟲可選擇高效氯氟氰菊酯噴霧。在大豆花莢期、鼓粒期,視大豆長勢葉面噴施磷酸二氫鉀、尿素、鉬酸銨、硫酸亞鐵、多元微肥、殺蟲劑、殺菌劑等,增加葉片營養(yǎng),?;ā⒈Gv、增粒重,實現(xiàn)一噴多效。密植、土壤肥力高或施肥量大等易出現(xiàn)旺長地塊,可在開花初期噴施烯效唑等化控劑進行控旺處理。
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