陰雪天氣日光溫室蔬菜生產(chǎn)技術(shù)指導(dǎo)意見(jiàn)

2021-11-12 09:26:55 來(lái)源:農(nóng)業(yè)農(nóng)村部種植業(yè)管理司 閱讀量:19084 評(píng)論

  【農(nóng)機(jī)網(wǎng) 科技創(chuàng)新】 
農(nóng)業(yè)農(nóng)村部蔬菜專家指導(dǎo)組
 
  11月6日-10日,東北地區(qū)出現(xiàn)冰凍雨雪、大風(fēng)寒潮天氣,普降大到暴雪,部分地區(qū)大暴雪,局部特大暴雪,并伴有15℃左右的強(qiáng)降溫和陣風(fēng),其中遼寧中西部和北部、內(nèi)蒙古東部出現(xiàn)特大暴雪。此次極端天氣過(guò)程強(qiáng)度大、時(shí)間長(zhǎng)、范圍廣、危害重,導(dǎo)致塑料大棚、連棟溫室、日光溫室等被壓變形、垮塌。針對(duì)暴雪和連續(xù)多日的陰雪天氣影響,對(duì)日光溫室蔬菜生產(chǎn)提出如下指導(dǎo)意見(jiàn)。
 
  一、及時(shí)除雪和檢查修繕各類設(shè)施。及早清除日光溫室積雪,認(rèn)真檢查破損情況,積極快速修復(fù)破損棚膜、壓膜線、骨架、內(nèi)外電路及卷簾機(jī)、放風(fēng)器、照明、水泵等設(shè)備。組織力量盡快清運(yùn)設(shè)施園區(qū)四周和主要通路的積雪,以防積雪融化導(dǎo)致溫室四周積水、淤濕。同時(shí)要注意除雪人員安全,特別是避免棚架坍塌,造成人員傷害。進(jìn)一步加固設(shè)施設(shè)備,以防再次遭遇更大風(fēng)雪。
 
  二、陰雪天氣較長(zhǎng)時(shí)的管理要點(diǎn)。如果陰雪天數(shù)超過(guò)3天,要在白天外界溫度不很低的時(shí)段,及時(shí)揭開(kāi)日光溫室保溫覆蓋物;白天外界溫度較低時(shí),也應(yīng)在中午短時(shí)間揭開(kāi)日光溫室保溫覆蓋物,以便讓蔬菜接受一些散射光,避免連續(xù)數(shù)日不揭開(kāi)保溫覆蓋物導(dǎo)致蔬菜植株生育障礙。
 
  三、天氣放晴初期管理要點(diǎn)。這次連續(xù)陰雪天氣時(shí)間長(zhǎng),保溫覆蓋時(shí)間也長(zhǎng),因此天氣驟晴后要注意采取間隔、交替揭開(kāi)日光溫室保溫覆蓋物或逐漸打開(kāi)保溫覆蓋物的方式,不能立即全部揭開(kāi)保溫覆蓋物,以防作物葉片在強(qiáng)光下失水萎蔫。若揭開(kāi)保溫覆蓋物后發(fā)現(xiàn)葉片萎蔫應(yīng)隨即回蓋保溫覆蓋物,待植株恢復(fù)后再逐步揭開(kāi),同時(shí)及時(shí)恢復(fù)通風(fēng)排濕。一般1~2天后可回歸正常管理。待植株適應(yīng)后,葉面適當(dāng)增施磷酸二氫鉀和氨基酸類葉面肥。
 
  四、加強(qiáng)陰雪后的田間管理。主要是注意日光溫室光照管理、蓄熱保溫管理、作物肥水管理、通風(fēng)降濕管理等。
 
  一是加強(qiáng)蓄熱保溫管理。暴雪后,常常伴隨急劇降溫,除了維護(hù)和加強(qiáng)日光溫室保溫覆蓋外,還可采取在保溫被與棚膜間加墊氣泡膜,在進(jìn)出門內(nèi)外增設(shè)簡(jiǎn)易緩沖間或圍擋,密閉溫室縫隙,前底腳圍“裙簾”,溫室內(nèi)張掛二道幕等措施,全面提高日光溫室的蓄熱保溫抗寒能力。有條件的地方,應(yīng)預(yù)備燃熱塊、燃油或燃煤熱風(fēng)爐、移動(dòng)式電熱風(fēng)機(jī)、取暖器等應(yīng)急加熱設(shè)備。
 
  二是加強(qiáng)光照管理。在溫度允許情況下要盡量早揭和晚蓋日光溫室保溫覆蓋物,延長(zhǎng)光照時(shí)間。揭保溫覆蓋物時(shí)間應(yīng)以揭開(kāi)保溫覆蓋物后溫室內(nèi)溫度不下降為宜;同時(shí)要適時(shí)蓋保溫覆蓋物,保溫性能好的日光溫室,夜間最低氣溫在0~-15℃季節(jié)應(yīng)在日光溫室內(nèi)溫度降至15~17℃時(shí)蓋保溫覆蓋物;夜間最低氣溫在-15℃以下季節(jié)應(yīng)在日光溫室內(nèi)溫度降至17~19℃時(shí)蓋保溫覆蓋物。保溫不良的日光溫室應(yīng)早蓋保溫覆蓋物。及時(shí)清潔棚膜,后坡與后墻懸掛反光幕,增加光照。有條件的地方可增加人工補(bǔ)光,一般每個(gè)燈40W,每667平方米安裝25盞左右為宜,在弱光季節(jié)每天補(bǔ)光3~4小時(shí),可顯著增加蔬菜產(chǎn)量和質(zhì)量。
 
  三是加強(qiáng)肥水科學(xué)管理。冬季要嚴(yán)格日光溫室蔬菜肥水管理,在室外最低氣溫-15℃以下時(shí),一般盡量少澆水。應(yīng)選擇在最低氣溫-10℃以上的晴天澆透水,覆蓋地膜保墑。如果蔬菜表現(xiàn)缺水,應(yīng)選寒流剛過(guò)、天氣晴朗的好天,采用膜下滴灌或膜下溝灌澆小水,以免降低地溫。陰雪天氣日光溫室內(nèi)地溫氣溫均較低,蔬菜根系吸收能力弱且生長(zhǎng)發(fā)育緩慢,應(yīng)盡量少進(jìn)行土壤追肥,但可適當(dāng)進(jìn)行葉面追肥,以緩解由于低溫寡照導(dǎo)致蔬菜生長(zhǎng)發(fā)育不良。一般可葉面噴施0.3%磷酸二氫鉀加0.3%硝酸鈣加1%的葡萄糖液;或0.3%復(fù)合肥(NPK為15:15:15)加0.2%氯化鈣再加1%的葡萄糖液。
 
  四是強(qiáng)化控濕防病。持續(xù)陰雪低溫天氣,日光溫室內(nèi)空氣濕度大,易誘發(fā)病害,應(yīng)在中午短時(shí)間通風(fēng)排濕,控制病害發(fā)生。發(fā)病后選用煙霧劑、粉塵劑防治,以利于均勻施藥和避免溫室內(nèi)空氣濕度過(guò)高。此外,在溫室內(nèi)壟溝中,盡可能鋪墊玉米與稻麥碎秸稈、稻殼、鋸末等吸濕物料,降低溫室濕度。
 
  五是增加地溫促根壯秧。若日光溫室尚處在耕整土地和定植階段,要注重增加地溫。一般采用增施有機(jī)肥及有機(jī)物料、寬行栽培、高畦大壟、地膜覆蓋、壟溝鋪設(shè)有機(jī)物料(鋸末、稻殼、碎秸稈)、膜下滴灌、一次澆透水減少澆水次數(shù)等措施,可提高地溫3~4℃,促進(jìn)根系生長(zhǎng)和養(yǎng)分吸收。
 
  六是適當(dāng)控制結(jié)果。持續(xù)陰雪低溫天氣,蔬菜植株生長(zhǎng)發(fā)育弱,要及早采收果實(shí)和適當(dāng)疏花疏果,以免加重植株負(fù)擔(dān),導(dǎo)致植株生育更弱,降低抗逆抗病能力。
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