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設(shè)施蔬菜冬季生產(chǎn)技術(shù)指導(dǎo)意見
2022-11-02
15:36:28
來源:全國農(nóng)技推廣中心 閱讀量:13999
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導(dǎo)讀:全國農(nóng)業(yè)技術(shù)推廣服務(wù)中心組織農(nóng)業(yè)農(nóng)村部蔬菜專家指導(dǎo)組、國家大宗蔬菜產(chǎn)業(yè)技術(shù)體系,研究提出設(shè)施蔬菜冬季生產(chǎn)技術(shù)指導(dǎo)意見。
【農(nóng)機(jī)網(wǎng) 熱點(diǎn)關(guān)注】為提升設(shè)施蔬菜冬季生產(chǎn)技術(shù)水平,有效防范應(yīng)對(duì)災(zāi)害性天氣,促進(jìn)蔬菜穩(wěn)產(chǎn)保供,全國農(nóng)業(yè)技術(shù)推廣服務(wù)中心組織農(nóng)業(yè)農(nóng)村部蔬菜專家指導(dǎo)組、國家大宗蔬菜產(chǎn)業(yè)技術(shù)體系,研究提出設(shè)施蔬菜冬季生產(chǎn)技術(shù)指導(dǎo)意見。
一、北方地區(qū)日光溫室生產(chǎn)
(一)強(qiáng)化設(shè)施維護(hù)加固
1.加固溫室。注意加強(qiáng)對(duì)日光溫室骨架和墻體、
卷簾機(jī)、放風(fēng)機(jī)、電路、應(yīng)急加熱等設(shè)施設(shè)備的檢查和維護(hù),尤其是對(duì)老舊溫室和抗風(fēng)雪承壓性能存在隱患的溫室,及早進(jìn)行維護(hù)和加固。
2.更換棚膜。在入冬前選擇無風(fēng)天氣及時(shí)更換破舊棚膜。其中,果菜類蔬菜生產(chǎn)溫室應(yīng)選擇長壽無滴高透光和高保溫的多功能塑料薄膜,薄膜厚度至少在0.10mm以上。東北高寒地區(qū)可選擇保溫性能更好的PVC多功能薄膜或PO膜,黃淮海及環(huán)渤海地區(qū)日光溫室可選擇防霧滴性能和流滴持效期長的PO膜或EVA多功能膜;西北與西藏地區(qū)、日光溫室采用東西向栽培模式的可選擇轉(zhuǎn)光膜或漫散射薄膜。
3.增強(qiáng)覆蓋。及時(shí)更換已經(jīng)損壞或保溫性能達(dá)不到冬季生產(chǎn)需求的保溫被等覆蓋物,一般草苫重量應(yīng)達(dá)3.5-4kg/m2,保溫被厚度達(dá)到2cm以上。前屋面保溫覆蓋物要緊密均勻,保溫覆蓋材料要干爽;高緯度地區(qū)要加蓋紙被或采用雙層保溫被,提高保溫效果,確保冬季溫室保溫性能達(dá)到溫室設(shè)計(jì)和蔬菜生產(chǎn)要求。
(二)加強(qiáng)生產(chǎn)環(huán)境調(diào)控
1.溫度管理。10月中旬以后,尤其夜間溫度低于10℃時(shí),及時(shí)覆蓋保溫覆蓋物,保證夜間溫室內(nèi)溫度15℃以上;12月至2月溫室內(nèi)白天溫度控制在26—32℃,晚上前半夜溫度保持在18—20℃,凌晨最低溫度保持在8℃以上。冬季只進(jìn)行頂部通風(fēng)即可;通風(fēng)時(shí)逐漸增加通風(fēng)量,同時(shí)采取棚室門口和棚前臉處懸掛薄膜、上通風(fēng)口的下方懸掛緩沖膜等措施;雨雪天氣時(shí),采取在保溫被外覆蓋塑料薄膜等措施,確保保溫被干爽保溫。連續(xù)陰天等極端天氣時(shí),采取多層覆蓋或使用增溫塊、高壓鈉燈、電熱爐、自動(dòng)加熱風(fēng)機(jī)等進(jìn)行臨時(shí)加溫。
2.光照管理。要經(jīng)常清掃清潔棚膜,保證透光率。在確保溫度前提下盡量早揭晚蓋保溫被以延長光照時(shí)間??稍跍厥液笃聮旆垂饽?,改善溫室北側(cè)光照,使溫室內(nèi)溫光分布趨于均勻,增加北側(cè)蔬菜產(chǎn)量。遇到連續(xù)陰雨雪天氣,只要不下雨下雪就要適當(dāng)短時(shí)間拉起保溫被,讓作物利用散射光進(jìn)行光合作用。有條件的地方可安裝高壓鈉燈,在補(bǔ)光的同時(shí)提高溫室內(nèi)溫度。遇到久陰乍晴天氣,中午前后要適當(dāng)放一半保溫被,避免植株失水萎蔫。
3.濕度管理。合理控制室內(nèi)濕度,降低病害發(fā)生概率。一般早晨保溫被打開后應(yīng)短時(shí)通風(fēng)排濕,時(shí)間不超過20分鐘;其后根據(jù)溫室內(nèi)作物生長及溫度等情況合理進(jìn)行通風(fēng)管理。遇到連續(xù)陰雨雪天氣,可在中午室內(nèi)溫度最高時(shí)段通風(fēng)10—20分鐘。灌水可采用膜下溝灌或膜下滴灌,并在壟溝中鋪蓋碎秸稈等吸濕物料;施藥可采用彌粉機(jī)、常溫?zé)熿F機(jī)、
臭氧發(fā)生器等新型藥械,以降低室內(nèi)濕度。
(三)落實(shí)關(guān)鍵農(nóng)藝措施
1.促根壯秧技術(shù)。增施充分腐熟優(yōu)質(zhì)有機(jī)肥、蚯蚓肥、腐殖酸肥等高碳堆肥,或采用秸稈生物反應(yīng)堆提高土壤溫度并同時(shí)補(bǔ)充CO2;果菜類蔬菜定植后覆蓋地膜前可進(jìn)行1—2次淺中耕,促進(jìn)根系深扎;低溫根系生長緩慢可施用腐植酸或海藻酸肥,提高根系活性,促進(jìn)生長;植株長勢弱可噴施葡萄糖或者氨基酸等含糖類、氨基酸類葉面肥,或噴施蕓苔素內(nèi)酯等植物生長調(diào)節(jié)劑,增強(qiáng)作物防寒抗凍能力。
2.?;ū9夹g(shù)。冬季低溫弱光時(shí),可施用植物生長調(diào)節(jié)劑進(jìn)行處理,確保低溫季節(jié)成功坐果和正常發(fā)育。番茄可在開花期使用對(duì)氯苯氧乙酸鈉1%可溶液劑400—670倍液,用手持式小
噴霧器均勻噴施盛開花果,噴濕為度。每個(gè)花朵用藥1次,不可重復(fù)噴施,用藥后的花序可作標(biāo)記以便區(qū)分。
3.植株調(diào)整技術(shù)。冬季溫室內(nèi)溫光條件相對(duì)較差,定植密度要適當(dāng)降低,一般是春季溫室栽培密度的70%—80%。茄果類、瓜類等蔬菜要適時(shí)進(jìn)行吊蔓、整枝、摘心、疏花、疏果、摘除老葉病葉等植株調(diào)整,改進(jìn)通風(fēng)透光條件,改善蔬菜營養(yǎng)狀況。遇到異常天氣時(shí),應(yīng)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)、降低抗逆能力。
4.肥水管理技術(shù)。優(yōu)先采用水肥一體化技術(shù)。冬季可使用海藻酸、魚蛋白、生物菌、甲殼素等促根肥料,再根據(jù)長勢選擇氮磷鉀含量不同的大量元素水溶肥。蔬菜生長前期選用高氮型水溶肥(推薦配方N-P2O5-K2O為22-12-16),每次每畝追施4—6kg,10—15天追施1次;番茄、辣椒、茄子等茄果類蔬菜生長中后期選用高鉀型水溶肥(推薦配方N-P2O5-K2O為19-6-25),黃瓜等瓜類蔬菜生長中后期選用高鉀高氮型水溶肥(推薦配方N-P2O5-K2O為20-8-22),每次每畝追施8—12kg,15天左右追施1次;優(yōu)先選用添加螯合態(tài)微量元素(TE)和海藻酸鉀、植物誘抗蛋白等植物刺激物(BS)的肥料產(chǎn)品。低溫季節(jié)可多噴施葉面肥,可葉面噴施0.3%磷酸二氫鉀+0.3%硝酸鈣+1%葡萄糖液,或0.3%高鉀型水溶性肥料+0.2%氯化鈣+1%葡萄糖液。對(duì)受冷害或凍害的植株,可噴施含氨基酸葉面肥、低溫誘抗劑等,再加施鈣鎂硼鋅鐵等中微量元素,促進(jìn)生長和花芽分化。
冬季蔬菜澆水要做到“三澆三不澆”,即晴天澆水、陰天不澆;午前澆水、午后不澆;澆小水、不澆大水。灌溉的水溫應(yīng)在10℃以上。應(yīng)選連續(xù)晴天的上午,采用膜下滴灌或膜下溝灌澆水,澆水后中午溫度高時(shí)及時(shí)通風(fēng)排濕。
5.病蟲防治技術(shù)。通過嫁接育苗、促根壯秧、膜下滴灌、通風(fēng)降濕等栽培和環(huán)境調(diào)控技術(shù)提高抗病能力,預(yù)防病害發(fā)生。在病害發(fā)生前定期噴施木霉菌、枯草芽孢桿菌、多粘類芽孢桿菌等微生物農(nóng)藥預(yù)防各類真菌、卵菌及細(xì)菌病害;病害發(fā)生初期及時(shí)施藥,低溫期盡可能用煙劑、熏劑和彌霧機(jī)施藥。要交替用藥,避免連續(xù)用一種有效成分藥劑或同一類藥劑。
二、南方地區(qū)塑料大棚生產(chǎn)
(一)加強(qiáng)生產(chǎn)環(huán)境調(diào)控
1.改善棚內(nèi)光照條件。選擇透光性好、流滴持效期長的多功能薄膜,薄膜厚度至少在0.08mm以上??蛇x擇PE或EVA多功能薄膜,有條件的也可以選擇PO功能膜。對(duì)透光率不能滿足蔬菜冬季生產(chǎn)光照要求的棚膜,要及時(shí)更換。同時(shí),在薄膜使用過程中,要及時(shí)清洗膜面,保證透光率。
2.落實(shí)保溫控濕措施。根據(jù)不同蔬菜種類對(duì)溫度的要求,在大棚內(nèi)采用輕型保溫覆蓋材料短期浮面覆蓋,或采用“大棚+中棚+小棚”多層覆蓋等方式保溫增溫。實(shí)施多層覆蓋的,白天都要及時(shí)打開,以保證棚內(nèi)升溫和光照強(qiáng)度。遇到強(qiáng)降溫等天氣,可采取臨時(shí)加溫技術(shù),并結(jié)合熏煙來減輕凍害程度。在不影響溫度前提下,盡量增加通風(fēng)量,排出濕氣,將棚內(nèi)濕度控制在85%以下;為降低濕度,在病蟲防控時(shí)優(yōu)先采用煙霧劑和粉塵劑,及常溫?zé)熿F機(jī)、彌粉機(jī)和臭氧發(fā)生器等新型設(shè)備。
3.做好低溫期水肥管理。低溫連陰天期間盡量少澆水,連續(xù)低溫天氣后,蔬菜根系生長很弱,必須使根系恢復(fù)活力后再澆水,以防止?jié)a根死苗。同時(shí),可通過噴施含糖類、氨基酸類葉面肥和生長調(diào)節(jié)劑(防凍劑)等,以使植株健壯,增強(qiáng)蔬菜抗寒能力。
(二)落實(shí)關(guān)鍵農(nóng)藝措施
1.促根壯秧技術(shù)。增施優(yōu)質(zhì)堆肥,提高土壤透氣性,促進(jìn)根系生長;采用高畦覆膜栽培,能夠膜下灌溉的,盡量采用膜下灌溉,或在栽培畦間覆蓋碎稻草、作物秸稈等吸濕材料,降低大棚內(nèi)濕度。
2.合理密植及時(shí)采收。根據(jù)作物栽培種類和環(huán)境條件,確定合理栽培密度,既要避免密度太高造成徒長和品質(zhì)下降,也要避免密度太低而影響產(chǎn)量。果菜類蔬菜要平衡低溫下秧果關(guān)系,根據(jù)情況及時(shí)采收;其他類型蔬菜,根據(jù)市場行情和植株商品性,合理安排采收。同時(shí),要隨時(shí)關(guān)注災(zāi)害預(yù)警,在災(zāi)害發(fā)生前,及時(shí)采收達(dá)到商品采收標(biāo)準(zhǔn)的蔬菜,以降低災(zāi)害可能造成的產(chǎn)量損失。
3.病蟲害防治技術(shù)。長江中下游及中部地區(qū)冬季設(shè)施蔬菜蟲害相對(duì)嚴(yán)重,主要發(fā)生蚜蟲、粉虱、薊馬、菜青蟲、小菜蛾、跳甲等;病害主要有灰霉病、番茄晚疫病、番茄細(xì)菌性斑點(diǎn)病、辣椒細(xì)菌性葉斑病、青枯病等。防治技術(shù)可參照北方溫室相關(guān)技術(shù)。
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