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地點: 巴彥淖爾市
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2022年吉林省大豆春播技術(shù)指導意見
2022-04-18
09:29:09
來源:吉林省農(nóng)技推廣總站 閱讀量:19097
評論
導讀:去年秋季吉林省大部降水較多,底墑較好。另據(jù)氣象部門預測,春季氣溫較常年略高,冷暖波動較大;降水較常年略少,時空分布不均。綜上所述,省農(nóng)業(yè)技術(shù)推廣總站結(jié)合生產(chǎn)實際提出2022年大豆春播生產(chǎn)技術(shù)指導意見。
【農(nóng)機網(wǎng) 地方農(nóng)機】去年秋季吉林省大部降水較多,底墑較好。另據(jù)氣象部門預測,春季氣溫較常年略高,冷暖波動較大;降水較常年略少,時空分布不均。綜上所述,省農(nóng)業(yè)技術(shù)推廣總站結(jié)合生產(chǎn)實際提出2022年大豆春播生產(chǎn)技術(shù)指導意見。
一、 合理輪作
結(jié)合大豆擴種計劃,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,促進農(nóng)業(yè)可持續(xù)發(fā)展。
二、適時整地
春整地要在土壤化凍18cm~20cm時整地封墑,采取耙地和起壟復式作業(yè),前邊耙地,后邊起壟,減少水分散失。起壟后要及時鎮(zhèn)壓,使壟體緊實,防止跑墑。土壤水分含量高時耕期后延,避免濕耕起大塊,起明條。
三、精細播種
(一)品種選擇。選擇優(yōu)質(zhì)、高產(chǎn)、耐密植、適合于機械化作業(yè)品種,禁止越區(qū)種植。
(二)種子處理。播前要進行種子精選,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)播種時期。根據(jù)吉林省氣候,播種最佳時間為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。提倡進行機械播種,加快播種進度。開展機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調(diào)整。
四、科學施肥
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%復合肥250-350公斤/公頃。一般播種前5~10天進行。播種時,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
除草劑適時進行化學除草,禁止使用長殘效除草劑。同時在春季干旱區(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片復葉期,雜草2~4葉期,依據(jù)雜草種類進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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