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山東省印發2024年全省玉米大面積單產提升技術指導意見
2024-05-29
08:40:08
來源:山東省農業農村廳 閱讀量:16289
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【農機網 通知公告】
關于印發2024年全省玉米大面積單產提升技術指導意見的通知
魯農技字〔2024〕17號
各市農業農村局:
為指導各地抓好玉米生產各環節關鍵技術措施落實,深入挖掘玉米單產潛力,促進大面積單產提升,我廳制定了《2024年全省玉米大面積單產提升技術指導意見》,現印發給你們,請結合當地實際,參照執行。
山東省農業農村廳
2024年5月25日
2024年全省玉米大面積單產提升技術指導意見
為深入挖掘玉米單產潛力,推動全省玉米實現大面積單產提升,特制定本意見。
一、提高播種質量,夯實高產基礎
全面提高播種質量是實現玉米高產穩產的基礎。小麥留茬過高、墑情不足、播種密度不合理等都會影響玉米播種質量,要重點抓好種子優選包衣、適期搶播、合理密植、防蟲除草等技術措施,確保苗全、苗齊、苗勻、苗壯。
(一)種子優選包衣。種子質量是提高玉米出苗質量的基礎,所選良種應符合純度≥98%、發芽率≥95%、凈度≥98%、含水量≤13%標準。應結合當地生產實際,科學選用高產穩產、耐密抗倒、多抗廣適、適宜機收的品種。魯南、魯西南地區小麥收獲較早,光溫充足,可以選用產量潛力大、生育期較長的品種;魯中、魯西北地區可選用生育期適中,高產穩產的品種;魯東地區可選用生育期略短、穩產的品種。籽粒機收地塊宜選擇生育期較短、穗位適中、抗倒伏、籽粒前期灌漿快、后期脫水快的品種。采用玉米密植精準調控高產技術的地塊,應特別注重選用耐密抗倒高產品種。玉米商品種大多進行了包衣,但包衣劑質量難以保證,應根據當地近年苗期主要病蟲害發生情況,科學選擇高質量種衣劑進行種子二次包衣或拌種,確保有效預防苗期病蟲害。預防玉米莖基腐病、絲黑穗病等,可選用吡唑醚菌酯、戊唑醇、精甲霜靈、咯菌腈、苯醚甲環唑等;防治灰飛虱、薊馬、地下害蟲等,可選用噻蟲嗪、吡蟲啉、氯氰菊酯、氟蟲腈或呋蟲胺等;可復配殺蟲殺菌藥劑,包衣防治蚜蟲、灰飛虱、地下害蟲、莖基腐病等。藥劑用量應嚴格按照登記用量或用藥說明施用。
(二)規范適墑播種。玉米生產“七分種,三分管”,提高播種質量是關鍵。貼茬直播是我省玉米的主要播種方式,應抓好小麥收獲與玉米播種的銜接,小麥收獲時應提高秸稈還田質量,留茬高度≤20厘米,秸稈切碎長度≤10厘米并拋灑均勻。玉米播種應采取單粒精播,宜選用多功能、高精度、氣力式或指夾式、種肥同播的高性能復式
播種機加裝北斗導航精量播種。等行距播種的,玉米行距為60厘米;寬窄行播種的,寬行70~80厘米,窄行40~50厘米。播種時應按照播種技術要求調試好
播種機械,先進行試播,達到要求后再進行大規模播種。要將播種機運行速度控制在5~7公里/小時,播深3~5厘米,做到播深、行距、覆土、鎮壓一致,防止漏播、重播或
鎮壓輪打滑。我省玉米播種期常年降水較少,近年因干旱影響玉米適期播種和出苗現象時有發生。各地應密切關注天氣預報,及早組織水源,確保在無有效降雨的情況下,有保苗水可用。播種后,灌溉水充足的建議澆“蒙頭水”,灌溉水有限的澆保苗水,確保玉米順利出苗。采用玉米密植精準調控高產技術的地塊,玉米單產提升工程縣和單產提升整建制推進縣宜采用滴灌節水方式確保播后滴水齊苗。同時也要注意極端強降雨,若小麥收獲期遭遇強降雨,應在播種機械具備進地條件后,收獲小麥后立即播種;播后苗前遭遇強降雨的,立即排水,防止因漬澇導致種子腐爛。
(三)合理密植施肥。提高玉米單產的關鍵措施是合理增加播種密度。播種密度應比預定收獲密度增加10%左右,未采用玉米密植精準調控高產技術的地塊,耐密型玉米品種一般大田每畝播種5000粒左右,示范田5500粒左右,攻關田5800~6000粒;大穗型品種一般大田每畝播種4600粒左右,高產田5300粒左右;配合施用配方肥或緩控釋肥,肥料控釋時間60~70天,控氮比30%左右,可選用N:P2O5:K2O配比為28-6-12或26-8-8等相近配方的肥料,普通地塊推薦用量40~45公斤,高產地塊每畝推薦用量45~55公斤,播種行外帶狀側深施8~10厘米,防止燒種和燒苗,同時添加鋅肥。采用玉米密植精準調控高產技術的地塊,播種密度應根據管理水平在原密度基礎上增加10%~20%。應在小麥收獲后立即免耕播種,采用寬窄行方式導航播種,寬行70~80厘米,窄行30~40厘米,行距偏差小于5厘米,滴灌帶鋪設在窄行內,種肥同播,種肥用量每畝純氮3~5公斤,P2O5 6~10公斤,K2O 6~8公斤。播后1~2天完成滴水齊苗,滴灌濕潤范圍超過播種行5厘米為宜。玉米單產提升工程縣和單產提升整建制推進縣有等條件的地區提倡推廣應用密植精準調控高產技術。
二、加強田間管理,挖掘單產潛力
培育健壯個體、構建合理群體,確保穗足穗大、粒多粒重是玉米出苗后田間管理的主攻方向。應綜合采取化學除草、合理化控、病蟲害綜合防治、精準水肥管理、抗逆減災等關鍵措施,深入挖掘單產潛力。
(一)科學運籌水肥。科學運籌水肥是形成健壯個體、合理群體、減少空桿、增加粒重、發揮品種高產潛力的重要保障。
玉米苗期對肥料需求不多,施用緩控釋肥的地塊和施用速效種肥的高產地塊,在苗期一般不需要施肥。苗期適度干旱可以促進根系下扎,起到蹲苗的作用,形成壯苗,提高抗逆性。苗期對淹水和漬澇比較敏感,若出現積水或漬澇,應立即排水。
小喇叭口期到大喇叭口期是玉米需肥的關鍵時期,大喇叭口至抽雄期是玉米需水的臨界期,此期肥水供應不足,容易造成植株細弱、群體整齊度差、生物量不足,導致雌雄穗發育異常或花期不遇。此期應保證充足的水肥供應,土壤相對含水量不低于70%,墑情較差時應進行灌溉;施用緩控釋肥的地塊如無缺肥癥狀可不追肥,只施用種肥和采用密植精準調控高產技術的地塊則應借水追肥或利用水肥一體化設備補充水肥,追肥以速效氮肥為主,占全生育期需氮量50%左右,機械追肥的應側深施。
灌漿期應保持土壤相對含水量應不低于60%,高產地塊追施總氮量20%左右,用作花粒肥,有條件的用無人機噴施1%~2%的磷酸二氫鉀和尿素,防止葉片早衰,延長灌漿持續期,增加粒重。
采用玉米密植精準調控高產技術的地塊,應于化控后5~7天、大喇叭口期、吐絲授粉期、乳熟期分次進行滴灌沖肥,畝追施純氮11~13公斤。蠟熟期如天氣干旱,可再進行1次滴灌,以延長葉片功能期。
(二)加強病蟲草害綠色防控。據有關部門預測,2024年全國玉米病蟲害預計總體偏重發生,黃淮地區,草地貪夜蛾偏重發生,玉米螟、棉鈴蟲、桃蛀螟和甜菜夜蛾穗期混合發生,南方銹病重發態勢明顯,對玉米生產安全構成較大威脅。應堅持“預防為主、聯防聯控”的防控策略,綜合應用抗性品種、生態調控、理化誘控、生物防治和科學用藥等措施,保障玉米生產安全。
玉米播種后出苗前,土壤墑情較好的地塊可用乙草胺、異丙甲草胺、乙·莠懸浮劑等進行封閉除草;未進行封閉除草或效果較差的地塊,可在玉米3~5葉期,雜草2~4葉期用煙嘧磺隆、苯唑·莠等進行苗后莖葉噴霧除草。煙嘧磺隆除草地塊避免使用有機磷農藥,以免產生藥害,同時注意噴灑均勻,不重噴、不漏噴,確保除草質量并注意用藥安全。種子包衣或拌種的地塊,苗期一般常規病蟲害不會嚴重發生,但突發、偶發性病蟲害無法精準預測,要加強預測預報,一旦發生,要趁早防治,切斷傳播路徑,降低損失。
大喇叭口期至開花授粉期,應實施“一防雙減”,通過組配殺蟲劑和殺菌劑,對病蟲害進行一次性防治,達到減少后期害蟲基數和減輕病害危害程度的目的。要提高飛防質量,確保藥液能夠滲透到群體中下層。應加強對南方銹病、蝸牛等偶發重發病蟲害的預報,提前做好預案,一旦發生重點防治。
根腐病、絲黑穗病、紋枯病和莖腐病等土傳病害主要通過種子包衣預防。如遇強降雨,應及時排出田間積水,努力減輕紋枯病和莖腐病的發生程度。紋枯病在發病初期(玉米拔節時),可噴施井岡霉素A等殺菌劑防治,并視發病情況隔7~10天再噴1次。南方銹病、大斑病、小斑病、褐斑病、彎孢葉斑病、白斑病、北方炭疽病等病害在發病初期,可選用枯草芽孢桿菌、井岡霉素A、苯醚甲環唑、氟環唑、吡唑醚菌酯、丙環·嘧菌酯、肟菌·戊唑醇、唑醚·氟環唑等殺菌劑防治,并視發病情況隔7~10天再噴1次。
草地貪夜蛾、玉米螟、粘蟲、棉鈴蟲、桃蛀螟等成蟲發生期,可使用燈誘、食誘、性誘劑等進行誘殺;產卵初期釋放赤眼蜂或夜蛾黑卵蜂等天敵滅卵;幼蟲低齡階段可選用蘇云金桿菌、球孢白僵菌、核型多角體病毒、金龜子綠僵菌、印楝素、短穩桿菌等生物農藥防治;化學防治可選用四氯蟲酰胺、氯蟲苯甲酰胺、甲氨基阿維菌素苯甲酸鹽、乙基多殺菌素、四唑蟲酰胺等殺蟲劑,抓住低齡幼蟲窗口期實施統防統治和聯防聯控。
(三)強化防災減災。玉米生育期正是遭遇干旱、高溫、強降雨、陰雨寡照、強風等氣象災害的高發期。應及早謀劃,科學制定預案,寧可十防九空,不可失防萬一。
強降雨。強降雨容易造成田間漬澇。如出現農田積水,應抓緊組織排澇,土壤濕度飽和形成漬澇的地塊要及時開挖瀝水溝,盡量在2天內排除積水,降低植株漬害程度。漬澇解除后應及時進行中耕松土,加快土壤水分散失,促進根系恢復生長。強降雨容易造成土壤養分淋失,降雨排澇后應及時補充速效氮肥,也可適當噴施葉面肥,促進玉米及時恢復生長,減少對產量的影響。
大風。強降雨往往伴隨強風,容易造成玉米植株倒伏。要根據倒伏時期和倒伏程度,因地因情施策。玉米小喇叭口期前遭遇大風,出現倒伏,可不采取措施,靠植株自我調節進行恢復。小喇叭口期后遭遇大風而出現的根部倒伏,應及時扶正,并淺培土,以促根下扎,增強抗倒伏能力,恢復葉片自然分布狀態,降低產量損失。對于開花后穗上部莖折的地塊,要及時割除莖折部分,改善玉米田通風透光條件,提高灌漿強度;對于穗下部莖折嚴重的地塊,可及早收獲,作為青貯飼料。
干旱。玉米不同生育期,抗旱能力不同,若出現嚴重干旱,均應及時灌溉。玉米苗期抗旱能力較強,適當干旱可以起到蹲苗的效果,促進根系下扎和基部節間粗壯,提高植株抗倒能力。大喇叭口到抽雄期如遇旱會造成“卡脖旱”,導致雌雄穗發育不同步,嚴重影響授粉,應及時灌水。因干旱造成植株生育遲緩的,應隨水適當補充速效氮肥。
高溫熱害和陰雨寡照。玉米開花授粉及灌漿階段如遭遇高溫熱害,容易影響花粉活力,造成結實性差、花粒、禿尖等現象,影響玉米產量。高溫發生前,可適當灌水,增加田間濕度,降低冠層溫度,并采用無人機低空飛行,增加擾動輔助授粉。開花授粉及灌漿階段如遭遇陰雨寡照,應及時噴施葉面肥,提高光合能力,增加有機物質運轉。
倒伏。種植密度增大,可能增加倒伏的風險。高產田尤其要注意合理化控。群體較大、水肥充足、存在旺長風險的夏玉米可在6~10片展開葉期間進行化控,最佳化控時間為7~9片展開葉期,可選擇矮壯素、乙烯利、胺鮮酯、胺鮮酯·乙烯利、胺鮮酯·甲哌鎓等化控劑,于晴朗無風的早晨或下午4點以后采用無人機或噴桿噴霧機均勻噴施玉米上部葉片。
采用玉米密植精準調控高產技術的地塊,要在6~8片葉展開期進行化控,若因天氣原因未適時化控或化控效果不理想,二次化控不應晚于11葉展開期進行。應噴施均勻,不重噴不漏噴。藥液要隨用隨配,濃度應遵照產品說明書使用,一般不與其他農藥和化肥混合使用。
三、適期減損收獲,實現顆粒歸倉
應堅持增收和減損兩端發力,抓好玉米適期晚收和機收減損工作,實現顆粒歸倉、豐收到手。
(一)適期收獲。適期收獲可增加粒重、減少損失、提高玉米產量與品質。玉米成熟的標志是植株的中、下部葉片變黃,基部葉片干枯,苞葉干枯呈黃白色而松散,籽粒脫水變硬乳線消失,微干縮凹陷,籽粒基部(胚下端)出現黑帽層,并呈現出品種固有的色澤。普通地塊應在10月1日-5日收獲,高產地塊和玉米單產提升整建制推進縣應在10月10日-15日收獲。
(二)機收減損。要強化機手培訓,提高裝備調試水平,提高收獲效率和減少收獲損失。適期收獲應大面積連片推進、整村整鎮推進、農機農藝聯合推進,提高收獲效率。同時還要提升應急收獲能力,針對可能發生的強降雨、大風導致農田積水、作物因災倒伏、機具供給局部緊張等緊急情況,制定農機防災救災應急預案,協調收獲機械和就近匹配烘干用機需求,保障已收糧食安全入倉,減少產后損失。
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