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2022年吉林省大豆春播技術(shù)指導(dǎo)意見

2022-04-18 09:29:09 來源:吉林省農(nóng)技推廣總站 閱讀量:19146 評論

導(dǎo)讀:去年秋季吉林省大部降水較多,底墑較好。另據(jù)氣象部門預(yù)測,春季氣溫較常年略高,冷暖波動(dòng)較大;降水較常年略少,時(shí)空分布不均。綜上所述,省農(nóng)業(yè)技術(shù)推廣總站結(jié)合生產(chǎn)實(shí)際提出2022年大豆春播生產(chǎn)技術(shù)指導(dǎo)意見。

  【農(nóng)機(jī)網(wǎng) 地方農(nóng)機(jī)】去年秋季吉林省大部降水較多,底墑較好。另據(jù)氣象部門預(yù)測,春季氣溫較常年略高,冷暖波動(dòng)較大;降水較常年略少,時(shí)空分布不均。綜上所述,省農(nóng)業(yè)技術(shù)推廣總站結(jié)合生產(chǎn)實(shí)際提出2022年大豆春播生產(chǎn)技術(shù)指導(dǎo)意見。
 
  一、 合理輪作
 
  結(jié)合大豆擴(kuò)種計(jì)劃,合理優(yōu)化結(jié)構(gòu)布局,選擇優(yōu)質(zhì)、高產(chǎn)大豆品種,推廣大豆與玉米、小麥、馬鈴薯隔年輪作,發(fā)揮大豆養(yǎng)地作用,以減少化肥投入,促進(jìn)農(nóng)業(yè)可持續(xù)發(fā)展。
 
  二、適時(shí)整地
 
  春整地要在土壤化凍18cm~20cm時(shí)整地封墑,采取耙地和起壟復(fù)式作業(yè),前邊耙地,后邊起壟,減少水分散失。起壟后要及時(shí)鎮(zhèn)壓,使壟體緊實(shí),防止跑墑。土壤水分含量高時(shí)耕期后延,避免濕耕起大塊,起明條。
 
  三、精細(xì)播種
 
  (一)品種選擇。選擇優(yōu)質(zhì)、高產(chǎn)、耐密植、適合于機(jī)械化作業(yè)品種,禁止越區(qū)種植。
 
  (二)種子處理。播前要進(jìn)行種子精選,剔除病斑粒、蟲食粒及雜質(zhì)。純度、凈度不低于98%,發(fā)芽率不低于90%,含水量不高于13%;播種前7天用35%多克福懸浮種衣劑拌種,低洼易澇根腐病嚴(yán)重的地塊加20%噻蟲嗪·咯菌清·精甲霜靈,防治大豆苗期病蟲害。
 
  (三)播種時(shí)期。根據(jù)吉林省氣候,播種最佳時(shí)間為5月1日~5月15日,東部地區(qū)最遲在5月25日前播完種。
 
  (四)播種方法。提倡進(jìn)行機(jī)械播種,加快播種進(jìn)度。開展機(jī)械壟上雙行等距精量播種,雙行間小行距10~12厘米,播深一般3~5厘米為宜,播后視土壤墑情及時(shí)鎮(zhèn)壓。
 
  (五)播種密度。東部山區(qū)小粒豆公頃保苗株數(shù)建議30~35萬株;中西部大粒豆播種一般公頃保苗20~23萬株。具體播量依據(jù)品種的耐密性、土壤肥力、施肥量、降雨及灌溉情況適當(dāng)調(diào)整。
 
  四、科學(xué)施肥
 
  總施肥量每畝15~20公斤,一般氮、磷、鉀可按1:1.1~1.5:0.8~1.2的比例??偸┓柿恐锌鄢N肥作為底肥。播前扶壟結(jié)合施底肥,底肥要做到分層側(cè)深施,上層施于種下5~7cm處,施肥量占底肥量的1/3。下層施于種下10~12cm處,肥量占底肥量的2/3(積溫較低冷涼地區(qū),適當(dāng)減少下層施肥比例)。肥料磷酸二銨為100~150kg、鉀肥100~150kg,或者使用45%復(fù)合肥250-350公斤/公頃。一般播種前5~10天進(jìn)行。播種時(shí),施種肥每畝地2~3公斤磷酸二銨,切忌種肥同位,以免燒種。
 
  五、化學(xué)除草
 
  (一)土壤封閉處理。播種鎮(zhèn)壓后1~2天,根據(jù)主要雜草種類選擇安全、高效、低毒的除草劑適時(shí)進(jìn)行化學(xué)除草,禁止使用長殘效除草劑。同時(shí)在春季干旱區(qū)宜采取苗后除草,土壤墑情好的地區(qū)宜采取土壤封閉處理的方式施藥。通常選擇的苗前封閉除草劑主要有異丙甲草胺、噻吩磺隆、2,4-D異辛酯等,按說明書施藥。
 
  (二)苗后莖葉處理。在大豆出苗后1~3片復(fù)葉期,雜草2~4葉期,依據(jù)雜草種類進(jìn)行苗后葉面噴霧處理。通常選擇的苗后除草劑主要有氟磺胺草醚、精喹禾靈、異噁草松、克闊樂等,按說明書施藥。
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