土壤日曬在綠色植保中的應用與展望
來源:用戶上傳
作者:
摘要 土壤消毒主要用于土壤病蟲草害防控。過去幾十年,土壤主要采用化學藥品熏蒸消毒,不合理使用容易造成環境污染。土壤蒸汽消毒、火焰消毒和熱水澆灌等需要專門的儀器設備,且存在能耗較高、滅生性強、容易破壞土壤結構等缺點。目前,土壤日曬技術受到意大利、美國、以色列等70多個國家農業科學家的廣泛關注,但在中國依然處于初級階段。本文總結了國內外學者關于土壤日曬對農業病蟲草害、土壤肥力、農作物產量等方面的影響與應用,分析了土壤日曬存在的局限性,并對土壤日曬在未來農業綠色防控上的應用前景進行了展望,以期為農產品無公害生產提供理論依據和實踐參考。
關鍵詞 土壤日曬; 土壤消毒; 病蟲草害; 綠色防控
中圖分類號: S 477
文獻標識碼: ADOI: 10.16688/j.zwbh.2018344
Abstract Soil disinfection is mainly used for control of soil pathogens, pests and weeds. In the past few decades, soil was mainly disinfected by chemical fumigation, but their misuse has caused environmental pollution. Soil steam disinfection, flame disinfection and hot water irrigation require special equipment. Moreover, these methods have some disadvantages, such as energy consumption, strong inactivation and easy to destroy soil structure, etc. At present, soil solarization attracts wide attention from agricultural scientists over 70 countries such as Italy, the United States and Israel, etc., but it is still in its infancy in China. This paper summarizes the influences and application of soil solarization on plant diseases, pests and weeds in agriculture, soil fertility, crop yield, etc., analyzes the limitations of soil solarization. Furthermore, the application foreground of soil solarization in future green prevention and control is prospected. So it can be expected to provide theoretical basis and practical reference for the pollutionfree production of agricultural products.
Key words soil solarization; soil disinfection; disease, pest and weed; green prevention and control
作物種植或移栽前,先用化學、生物或物理手段進行土壤消毒,可以減少土壤中有害生物的基數,降低作物生長后期被其危害的風險[1]。溴甲烷作為風靡一時的土壤消毒劑,從19世紀40年代開始投入使用,因其高效性和廣譜性,60年代至80年代逐漸成為使用最廣泛的土壤熏蒸劑[2]。然而,1992年《蒙特利爾議定書》列出溴甲烷對臭氧層具有破壞作用[3],并要求世界各國分別在2005-2015年期間逐步禁用溴甲烷作為土壤消毒劑[4]。隨后,市場上相繼出現了大量替代溴甲烷的化學產品[5],如:氯化苦、1,3二氯丙烯、棉隆、威百畝、臭氧、福爾馬林等。這些替代品中,有些對土壤的消毒效果并不理想;有些雖然效果好,但使用成本過高;有些對人畜和環境有害等[6]。日本學者Shinmura[7]和荷蘭學者Blok等[8]在2000年發展了生物熏蒸技術,通過在地膜下加入有機物,厭氧發酵生成有害氣體殺滅土壤病原菌和線蟲,然而生物熏蒸需要選擇合適的有機質和溫濕度條件,限制了該技術的廣泛運用。純物理的土壤消毒方法包括蒸汽消毒[9]、火焰消毒[10]、熱水澆灌[11]、土壤日曬[12]等。蒸汽消毒、火焰消毒和熱水澆灌等需要專門的機械設備,需要專業的技術人員操作,在發達國家應用較多,在我國大面積推廣應用存在一定的困難。而且這些方法仍有能耗較高,滅生性強[13],容易破壞土壤結構等缺點[1415]。而土壤日曬技術是通過紫外線、太陽能加熱和光催化三種方式聯合消毒防治病蟲草害。殺滅土壤內有害生物主要依賴太陽能加熱消毒。該方法操作簡單,即選擇陽光充足的夏季,在地面灌水覆膜,膜四周用土壤壓蓋嚴實,待陽光照射膜面,通過提高膜下土壤溫度將土壤中的有害生物殺死[16]。土壤日曬一般在作物種植或移栽前使用,能夠有效地消滅或降低土壤中原有不耐高溫的有害生物[1718],對許多有益微生物影響較小,對人畜和環境相對安全,不影響農作物正常生長,甚至還能提高農作物產量[19]。
土壤日曬技術最早報道于1976年,以色列學者 Katan成功利用土壤日曬防治番茄和茄子枯萎病及幾種雜草[2021];后來許多國家根據各自的條件改進,成為廣泛使用的土壤消毒技術[22]。目前,土壤日曬技術受到意大利、美國、以色列、澳大利亞等70多個國家農業科學家們的廣泛關注[2324]。中國關于土壤日曬技術的研究起步較晚,雖然有高溫悶棚防治病害和線蟲的例子,但研究均不深入,而且主要局限于設施蔬菜,對露地作物開展土壤日曬消毒的應用甚少。本文總結了國內外學者關于土壤日曬對農業病蟲草害、土壤肥力、農作物產量等影響的研究與應用,分析了土壤日曬技術的局限性和存在的問題,在此基礎上對土壤日曬在未來農業綠色防控方面的應用前景進行了展望,以期為我國農產品無公害生產提供理論依據和實踐參考。 1 土壤日曬技術在控制農業病蟲草害中的應用
土壤日曬技術已經成功地運用到某些病蟲草害的防控,其主要機理是通過快速提高土壤溫度,引起生物膜不穩定或破壞生物膜功能,導致生物的呼吸酶失活而窒息死亡[25]。
土壤日曬對土壤微生物的種類和結構產生很大的影響[2627]。大量學者研究表明,溫度超過50℃容易導致病原菌的熱死亡,但也有學者認為45℃是病原菌的亞致死溫度,倘若在45℃條件下持續更長時間,也能將病原菌殺死,況且有些病原菌對溫度更敏感[2829]。例如,土壤溫度達到39℃時,終極腐霉Pythium ultimum、立枯絲核菌Rhizoctonia solani、根串珠霉Thielaviopsis basicola等繁殖體接近死亡[30]。土壤日曬可以殺滅大多數植物病原菌[31]。通過日曬處理后,土壤真菌的數量快速減少85%~90%;陰性熒光假單胞菌和革蘭氏陽性細菌(包括芽胞桿菌)的數量減少78%~86%;放線菌的數量減少45%~58%[27]。因此,許多地中海國家長期采用土壤日曬技術防治番茄真菌性土傳病害[32],尤其是土壤日曬可以有效地控制危害番茄的大麗輪枝孢Verticillium dahliae,也可以抑制引起辣椒莖腐爛的尖鐮孢Fusarium oxysporum f.sp. melonis[3334]。土壤日曬技術還能有效地防控韭蔥白腐病菌Sclerotium cepivorum、蠶豆立枯絲核菌Rhizoctonia solani、羅勒屬植物寄生疫霉Phytophthora nicotianae var. parasitica、辣椒白絹病菌Sclerotium rolfsii、草莓枯萎病菌Fusarium oxysporum、根癌農桿菌Agrobacterium tumefacien、番茄潰瘍病菌Clavibacter michiganensis、馬鈴薯瘡痂病菌Streptomyces scabies等[29,3536]。另外,倘若作物種植面積太大,為了降低土壤日曬技術帶來的經濟成本,可以在作物育苗前將苗床進行日曬,培養出健康的移栽苗[37]。例如,孟加拉國農民在水稻苗床上應用土壤日曬技術,能夠有效地控制水稻苗期病蟲害[38]。
除了防控對作物生長有害的病原菌外,土壤日曬還能增加某些優勢菌群的數量[39]。例如,經過土壤日曬處理后,土壤中的假單胞菌Pseudomonas spp.、青霉Penicillium spp.、曲霉Aspergillus spp.、鐮刀菌Fusarium spp.、木霉Trichoderma spp.、踝節菌Talaromyces flavus等數量顯著增加[4041]。踝節菌Talaromyces等有益微生物的增加,可有效地控制由輪枝孢引起的茄子枯萎病[42]。因此,土壤日曬也能通過提高優勢菌群的數量達到間接防治病原菌的效果。
土壤日曬對高溫耐受性不強、活動能力較差的土居害蟲具有顯著的防治效果[43]。史彩華等[44]在我國率先發明了“日曬高溫覆膜”防治韭菜遲眼蕈蚊Bradysia odoriphaga的新技術,該技術的操作方法與土壤日曬類似,中國北方在陽光充足的4月底至9月中旬,割除韭菜葉片后覆膜,只要土壤5 cm深處溫度達到40℃且持續4 h以上,就能將韭菜遲眼蕈蚊100%殺死,同時兼治薊馬、蚜蟲、蝸牛等?!叭諘窀邷馗材ぁ奔夹g已經在山東、河北、河南、天津、甘肅、北京、浙江、安徽、山西等地進行過試驗示范,其防治效果均高達100%,這一結果充分證明了該技術防治韭菜遲眼蕈蚊的可行性、高效性和快速性,為土壤日曬可能有效防控其他土居病蟲害提供間接有力的證據。
土壤日曬也能有效地消滅或減少土壤30 cm深處不同種類的線蟲[4546]。在美國北部,土壤日曬主要用于防治蔬菜和花卉的根結線蟲Meloidogyne spp.[47]。經土壤日曬處理后,番茄根結指數顯著降低,根部和土壤中的爪哇根結線蟲Meloidogyne javanica的數量分別減少91%和62%[48]。另外,土壤日曬還可以防治馬鈴薯白線蟲Globodera pallida、短體線蟲Pratylenchus spp.、腎形線蟲Rotylenchulus reniformis、大豆孢囊線蟲Heterodera glycines、刺線蟲Belonolaimus spp.、較小擬毛刺線蟲 Paratrichodorus minor、劍線蟲Xiphinema spp.、葡萄輪紋線蟲Criconemella xenoplax、起絨草莖線蟲Ditylenchus dipsaci、馬鈴薯孢囊線蟲Globodera rostochiensis、雙角螺旋線蟲Helicotylenchus digonicus、北方根結線蟲Meloidogyne hapla、彎鉤針線蟲Paratylenchus hamatus、甜菜異皮線蟲Heterodera schachtii等[4649]。
土壤日曬還可以控制雜草生長。該技術防治雜草最早起源于印度[50],即炎熱的夏季,在濕潤的土壤上覆蓋塑料薄膜,持續4~6周可以殺死90%的雜草,尤其是一年生雜草[51]。例如苘麻Abutilon theophrasti、反枝莧Amaranthus retroflexus、野燕麥 Avena fatua、黑芥Brassica nigra、藜Chenopodium album、田旋花Convolvulus arvensis、銀膠菊Parthenium hysterophorus、列當Orobanche coerulescens、臭薺Coronopus didymus、龍爪茅Dactyloctenium aegyptium、光頭稗Echinochloa colonum、蒼耳 Xanthium strumarium 等[52]。土壤日曬對多年生雜草的防除效果較差,只能殺死多年生雜草的葉部,對根和球莖等部位的作用較小,即使葉部死亡,后期根莖部位依然可以恢復生長,甚至加速生長,如香附子Cyperus rotundus、馬唐Digitaria sanguinalis等[53],其主要原因可能是多年生雜草的根系埋藏較深,深層次土壤溫度又難以大幅度提升,從而導致溫度達不到雜草根系的死亡閾值[54]。另外,土壤日曬對雜草的防治效果還受其他因素的影響,包括覆蓋膜的顏色、雜草的生長時期和土壤濕度等,例如:透明聚乙烯膜覆蓋對雜草的控制效果顯著高于黑色聚乙烯膜;休眠中的雜草和土層深處的雜草種子不受日曬的影響;潮濕土壤實施日曬技術對雜草的控制效果比干燥土壤更好等[55]。 2 日曬對土壤肥力和作物產量的影響
土壤日曬能夠引起土壤產生諸多復雜的物理化學和生物學特性變化。比如分解有機質,提高土壤可溶性氮(NH+4, NO-3)、鉀、鎂、鈣、鈉等元素的含量,降低土壤中錳的含量[56]。土壤日曬可以促進有機質大量分解,也可以導致硝化細菌大量死亡,從而提高可溶性氮的積累[57]。另外,土壤日曬改善土壤理化性質,影響土壤微生物系和土壤動物群體內的酶活系統[58],最終促進作物生長和提高產量[59]。大量研究表明,經過土壤日曬后NH4N和 NO3N的濃度在0~15 cm的土壤層中增加[57],暗示土壤溫度的增加提高了土壤有機氮[56]。Morra等[56]的研究表明,土壤日曬提高了土壤有機碳含量,有利于綠葉蔬菜的生長。例如:經土壤日曬處理后,秋葵Abelmoschus esculentus葉部組織中的碳、鉀、氮、鎂的含量更高,磷和鋅的含量降低[4]。
土壤日曬在不同程度上促進作物生長,提高作物產量[33,60]。主要原因可能包括3個方面:其一,土壤日曬有效地控制了土壤中的病蟲草害;其二,土壤日曬改善了土壤的結構;其三,土壤日曬增加了作物可吸收的有效氮和其他營養物質[2]。例如,土壤日曬使花生Arachis hypogaea、馬鈴薯Solanum tuberosum和茄子Solanum melongena的產量分別提高了123%、35%和215%[20]。另外,土壤日曬也分別增加了棉花Gossypium spp.、洋蔥Allium cepa、胡蘿卜Daucus carota、黃瓜Cucumis sativus、萵苣Lactuca sativa和草莓Fragaria ananassa等作物的產量[6164]。
3 土壤日曬的受限因子及存在的問題
土壤日曬的核心是提高土壤溫度殺死一些耐受性較差的病蟲草[19]。然而,影響土壤升溫的因素較多,如土壤濕度、土壤顏色、土壤結構、太陽光照強度、大氣溫度、膜材質、膜顏色、膜厚度等[65]。另外,土壤溫度提升與膜的密閉性、膜內外溫差和日曬期間的氣候條件等有關[4]。在密閉的環境下,覆膜面積越大,引起膜內外環境溫差越大,土壤升溫效果越好[66]。Castronuovo等[67]的研究表明,在密閉的溫室條件下,土壤升溫效果比露地快。Ham等[68]的研究表明,覆膜比未覆膜的土壤平均高出6℃,且它們之間的差異隨著土壤深度變化而變化。Pinkerton等[69]的研究表明,土壤日曬期間,白天土壤5~30 cm深處的最大溫度比未覆膜的高8~16℃,但夜間相差較小,僅為2~4℃。為了明確土壤日曬的最佳時期,有學者研究表明,覆膜后土壤10 cm深處的最高溫度在白天超過35℃,且覆膜與未覆膜土壤的平均溫差超過10℃,就可進行土壤日曬處理[4]。
土壤日曬受土壤濕度影響較大[70]。大多數學者認為,水能夠很好地吸收紅外輻射,根據水的物理性質,濕潤土壤的吸熱效果比干燥土壤更強[7172]。另外,土壤濕度有利于提高熱傳導性,促使熱量快速進入深層土壤,消滅深層土壤中的病蟲草[73]。因此,日曬期間保持土壤濕潤至關重要。濕潤土壤可以提高雜草種子和土壤微生物的新陳代謝,打破其休眠,待土壤溫度升高至一定程度后,破壞其細胞,導致其死亡[71]。前人研究表明,隨著土壤濕度增加,熱能和熱傳導也隨之增加[74]。然而,AlKaraghouli等[75]的研究表明,日曬期間的最大土溫隨著土壤濕度的進一步增加而降低;Bohra等[76]的研究表明,日曬期間,干旱土壤5 cm深處的溫度增加10℃,濕潤土壤僅增加7℃。以上暗示在覆膜之前對土壤澆水非常重要,但水量不能太大,避免土壤成泥沾染在薄膜表面,影響陽光透射。DeVay等[77]認為土壤60 cm深處的含水量達70%可獲得最佳的日曬效果。
土壤日曬也受土壤生態影響,例如土壤類型、土壤顏色、土壤結構、有機質含量等[78]。前人研究表明,黑土比淺色土壤更容易吸收陽光輻射[79],暗示土壤有機肥力過于貧乏,也會影響日曬效果。因此,在土壤中增加動物糞便或植物殘渣,改善土壤質地,有助于提高土壤日曬的效果。其主要原因可能包括3個方面:其一,有機質增加了土壤濕度,提高了土壤的導熱性;其二,有機質中微生物的熱反應可以提高土壤溫度1~3℃;其三,日曬升溫加速了有機質分解,產生的生物毒素可能具有熏蒸殺死土壤有害微生物的作用[80]。前人研究表明,土壤日曬時加入甘藍Brassica napus殘渣,其釋放的芥子油苷和代謝產物對土壤中尖孢鐮刀菌Fusarium oxysporum具有很好的熏蒸防控效果[81]。另外,土壤日曬受土層深度的影響較大,一般近地表的溫度最高,隨著土壤深度增加溫度降低[82]。土壤0~5 cm深處的溫度可超過50℃,10~15 cm深處的溫度可達40~50℃,但是土壤20~30 cm深處的溫度僅達36~40℃[83]。當土壤溫度達到42℃時,大部分土傳病害和土壤昆蟲失去活力,甚至死亡[50]。暗示常規的土壤日曬可以控制土壤20 cm左右的病蟲草害。倘若防治更深土層的病蟲草,需要配合其他輔助手段來增加更深土層的溫度。
塑料材質與土壤升溫效果的關系十分緊密[84]。低密度聚乙烯和乙炔醋酸乙烯對土壤的升溫效果最好[85];乙炔醋酸乙烯膜對土壤的升溫效果比聚乙烯膜更好[72]。然而,聚乙烯膜在農業上的應用較早,1939年已經開始規?;a。因此,目前聚乙烯膜在農業上的應用非常普遍。塑料膜顏色是獲得太陽輻射能量,減少長波輻射返回的重要參數[7, 54]。黑色、不透明或半透明的塑料膜減少了太陽輻射能量的透過,大部分能量被返回到大氣中,少量的熱能進入土壤中[86]。因此,膜的透明度影響了土壤的升溫效果。前人研究表明,透明膜升溫效果最佳,其次是黑色膜,最差的是白色膜[75]。AlKaraghouli等[87]的研究表明,聚乙烯膜的透射率依次為:透明膜>紅色膜>綠色膜>黃色膜>藍色膜>黑色膜,也進一步間接證實了透明膜對土壤的升溫效果最佳。膜的厚度也是影響土壤升溫的關鍵因子。薄塑料膜能夠透過太陽光短波,而阻擋地面的長波傳回大氣層,長波輻射被轉換成波長更長的紅外能量,產生溫室效應[88]。因此,薄塑料膜的升溫效果比厚塑料膜好。Katan[1]的研究表明,塑料膜厚度為25~30 μm時升溫效果更好,而且雙層膜比單層膜效果更好。當然,膜的選擇與使用也需要結合農事實際情況,綜合考慮膜的結實性和實用性等。另外,一般膜邊緣溫度較低,為了減少邊際效應,膜面積盡量大于田塊面積,覆膜也要盡量均勻,避免在膜內形成空氣泡影響升溫效果。 土壤日曬升溫最主要依靠太陽光的輻射能量[89]。因此,選擇日曬的時期至關重要,不同地區選擇日曬的時期不盡相同。夏威夷4-8月是最佳日曬季節[50];中國北方4月底至9月中旬均可進行土壤日曬[44];地中海、沙漠、熱帶氣候等在夏季空氣溫度較高的時期進行土壤日曬效果最佳[90]。無論什么地域,一般選擇太陽輻射較強的天氣覆膜4~6周;若碰到陰雨天氣,可延長覆膜時間至10~14周或者更長[86,91]。然而,有些學者認為土壤日曬的時間一般持續18~33 d(平均24 d),如果時間過長,將會導致土壤有益微生物缺氧死亡,而且覆膜時間太長,直接影響農民的種植計劃[4]。當然,土壤日曬時間與防治的對象有關,針對淺土層不耐高溫的病蟲草害,可以適當減少覆膜時間,如史彩華等[44]選擇太陽光照強烈的天氣覆膜,僅僅只要土壤溫度達到40℃且維持4 h則可100%殺死韭蛆。土壤濕度、太陽光照強度、塑料膜材質、土壤質地、覆膜時間等均能影響土壤日曬的效果[92],尤其太陽光照強度更是重中之重。
4 展望
土壤日曬技術可有效地殺滅土壤中不耐高溫的病蟲草害,具有操作簡單、經濟有效、對環境安全友好等優點,而且易學易培訓,它的應用可以顯著降低化學農藥施用量,適合有機農業或其他低能耗的農業系統。在不影響種植計劃的前提下,我國農民可以選擇每年的4-9月移栽或種植新作物之前,進行土壤日曬,不僅能夠消滅或降低土壤中原有不耐高溫的病蟲草,也能增加土壤中有機質的分解速率,改善土壤團粒結構,提高作物的吸收利用率,促進作物生長并提高產量與品質。另外,倘若能夠將土壤日曬技術配套機械化操作,將進一步降低人工勞動成本,提高工作效率。總體而言,科學合理地利用土壤日曬技術,在綠色植?;蛴袡C農業中存在巨大潛力。
當然,土壤日曬技術也存在明顯的局限性,對病蟲草害的防控效果受諸多外界環境因素的影響。例如,土壤日曬對高溫耐受性較強的病蟲草害防控效果較差;土壤覆膜時可能要求停止生產,而且覆膜時間要求較長,可能影響農民的種植計劃;土壤日曬后容易造成膜污染,雖然降解聚乙烯膜解決了這一難題,但也提高了使用成本等[70]。由于病蟲草害所在土層的溫度是影響土壤日曬防治效果的關鍵,若能快速高效地提高土壤溫度達到病蟲草的致死閾值,或許能夠更加徹底地殺死土壤中的有害生物,同時也能縮短覆膜時間,保證種植計劃正常進行。因此,科學家們要繼續努力,在土壤升溫和保溫所用材料上加大研發力度。
土壤日曬存在固有的局限性,導致日曬效果并不穩定。因此,可以將土壤日曬技術與其他一些生物、化學和物理的手段聯合使用,提高土壤日曬對有害生物的防治效果[4]。例如,事先采用有機質修復土壤,然后再覆膜,這樣可以顯著降低有害生物的致害活力。張廣榮等[93]在土壤中添加麥草和雞糞后進行日曬,土壤5 cm處的溫度顯著高于對照組,最高溫度甚至超過60℃且持續5 h以上,土壤日曬處理一次能夠100%控制第一茬和第二茬的黃瓜根結線蟲;焦永剛等[94]進行悶棚土壤日曬,并在土壤中添加有機肥和速腐劑,發現茄子的產量顯著提高。單純的土壤日曬或堆肥發酵不能完全防治萵苣上的南方根結線蟲,但是將土壤日曬和堆肥結合起來使用,可以徹底防治南方根結線蟲,提高萵苣的產量[95];施用雞糞與土壤日曬聯合作用,顯著減輕土傳病害炭腐病的發生,提高作物產量[96]。以上暗示土壤日曬技術有可能解決未來秸稈還田帶來的病蟲草害問題,尤其是田塊連作問題。曾經農民焚燒多余的秸稈,除了燒死秸稈中殘留的病蟲草,也可改善土壤肥力。如今禁止焚燒秸稈,鼓勵秸稈粉碎還田,積累了大量的病蟲草害。倘若秸稈還田后,配套土壤日曬技術,其作用或許類似秸稈焚燒,甚至可以加速土壤中其他病蟲草害死亡,同時也可腐熟秸稈提高土壤中有機肥的含量。張廣榮等[93]的研究表明,土壤日曬時添加甘藍葉,對黃瓜地第一茬和第二茬的根結線蟲防治率分別達100%和50%,雖然對第二茬的根結線蟲防效較低,但是大面積種植甘藍的地區,有大量甘藍葉尾菜需要處理,如果與土壤日曬聯合起來,既可變廢為寶,不使用或減少使用化學農藥,保護環境,降低農藥殘留,又可以增加有機肥,改良土壤結構,防治病蟲害等。以上暗示作物收獲后剩下不好處理的殘枝落葉等均可作為填充物,試著與土壤日曬聯合作用,變廢為寶,特別適合大面積種植蔬菜的區域。同時,土壤日曬技術也可與化學熏蒸劑、殺蟲劑和除草劑等聯合使用,破壞生物體的呼吸系統或導致其呼吸酶失活而死亡[97]。劉敏艷等[98]的研究表明,高溫悶棚與多菌靈聯合作用對西瓜枯萎病和茄子黃萎病的防治效果均超過90%,而用多菌靈灌根對西瓜枯萎病和茄子黃萎病的防治效果僅分別為67.08%和68.86%。董海龍等[99]的研究表明,高溫悶棚時在土壤中添加石灰氮,與單一悶棚組進行比較,120 d后對黃瓜根結線蟲的防治率提高了60%,產量增加了5.7%。因此,防治地下害蟲時,也可以考慮在塑料膜下安裝滴管施藥,與土壤日曬聯合作用,既可減少藥劑的用量,又可加速害蟲死亡。此外,土壤日曬還可以與其他物理設備聯合使用,如日曬時澆灌熱水加速或協同升溫消滅土壤中的病蟲草害[72]。2018年,北京理工大學和中國農業科學院合作研發出利用菲涅爾透鏡聚光器再生太陽能的土壤消毒裝置,可將土壤最高溫度保持在85℃,有效殺滅土壤中的病原菌、害蟲和卵[43]。
總體而言,目前土壤日曬技術在我國農業生產上的應用仍然處于初級階段。因此,土壤日曬的實用價值還需要進一步評估,比如對病蟲草害的防治管理[4]、對作物生長和產量的影響[100]、對農藥和肥料減量的可預見性[101]、對經濟成本和經濟效益的評價[102]等。另外,也要考慮有害生物對土壤日曬產生的抗性[103105]。隨著人們對食品安全、生活環境、生態健康的廣泛關注,土壤日曬技術配套其他有害生物的防治途徑在農業上的作用將變得越來越重要。土壤日曬技術作為一種經濟易學、操作簡單、綠色環保的農業技術,與其他物理、化學和生物防治手段配合使用,或將成為今后世界農業綠色防治道路上的一項新舉措,意義深遠,潛力巨大。 參考文獻
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