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        施硅提高干濕交替條件下番茄節(jié)水性及產(chǎn)量和品質(zhì)

        2017-12-15 02:27:06曹逼力張志煥
        農(nóng)業(yè)工程學(xué)報 2017年22期
        關(guān)鍵詞:產(chǎn)量質(zhì)量

        曹逼力,張志煥,徐 坤

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        施硅提高干濕交替條件下番茄節(jié)水性及產(chǎn)量和品質(zhì)

        曹逼力,張志煥,徐 坤※

        (山東農(nóng)業(yè)大學(xué)園藝科學(xué)與工程學(xué)院,泰安 271018)

        硅在提高作物抗旱性中具有重要作用。干濕交替灌溉是通過對植物根系施加干旱處理,來誘導(dǎo)自身的干旱調(diào)節(jié)潛能的一種節(jié)水增產(chǎn)技術(shù)。關(guān)于節(jié)水灌溉影響作物生理特性的研究,結(jié)論不盡相同。干濕交替的灌溉方式是否適應(yīng)于番茄栽培,且在該灌溉技術(shù)下施硅對番茄產(chǎn)量品質(zhì)有何影響,鮮見報道。為探討干濕交替條件下施硅對番茄的影響,采用潮汐式灌溉系統(tǒng)模擬干濕交替的灌溉方式,研究了干濕交替條件下硅對番茄植株硅質(zhì)量分?jǐn)?shù)、植株生長、果實產(chǎn)量及品質(zhì)的影響。結(jié)果表明,營養(yǎng)液加硅使番茄根、莖、葉、果的硅質(zhì)量分?jǐn)?shù)分別提高 494%、444%、246%、631%。在番茄幼苗期至開花坐果期,采用干濕交替的灌溉方式利于控制長勢、培育壯苗,但結(jié)果前期至結(jié)果后期,尤其盛果期,則不宜采用干濕交替的灌溉方式。干濕交替造成了番茄的嚴(yán)重減產(chǎn)及番茄紅素質(zhì)量分?jǐn)?shù)、維生素C質(zhì)量分?jǐn)?shù)、可滴定酸質(zhì)量分?jǐn)?shù)的下降,但顯著提高番茄果實的可溶性蛋白質(zhì)量分?jǐn)?shù)、游離氨基酸質(zhì)量分?jǐn)?shù)、可溶性固形物質(zhì)量分?jǐn)?shù)、可溶性糖質(zhì)量分?jǐn)?shù)、可滴定酸質(zhì)量分?jǐn)?shù)、果實硬度、糖酸比,尤其糖酸比提高了 30%,而施硅可緩解干濕交替對番茄生長發(fā)育后期果實產(chǎn)量和品質(zhì)的不利影響??傊?,干濕交替下施硅,在促進(jìn)番茄穩(wěn)產(chǎn)優(yōu)質(zhì)協(xié)調(diào)形成的前提下,可節(jié)水23%。該研究探討了多變低水條件下硅的調(diào)控效應(yīng),豐富了硅提高植物抗旱性的理論內(nèi)容,研究結(jié)果對實現(xiàn)合理節(jié)水并提高番茄商品率具有重要的意義。

        硅酸鹽;灌溉;果實;干濕交替;產(chǎn)量;品質(zhì)

        0 引 言

        自然降水的不規(guī)律性與作物的關(guān)鍵需水期不一致,顯著影響作物的生長發(fā)育[1]。通過調(diào)節(jié)和管理作物用水,開展多變低水條件下作物產(chǎn)量品質(zhì)變化的研究,是探索穩(wěn)產(chǎn)、優(yōu)質(zhì)、節(jié)水栽培措施的有效途徑。其中,干濕交替灌溉,是指在作物生育過程中,進(jìn)行灌水、落干重復(fù)循環(huán)的灌溉方式。該技術(shù)是通過對植物根系施加干旱處理,來誘導(dǎo)自身的干旱調(diào)節(jié)潛能的一種節(jié)水增產(chǎn)技術(shù),已在水稻[2-3]、玉米[4-5]、小麥[6]栽培上進(jìn)行示范,且節(jié)水效果明顯。番茄()是中國設(shè)施栽培面積最大的蔬菜之一,關(guān)于干濕交替灌溉對番茄產(chǎn)量、品質(zhì)的影響,有待進(jìn)一步研究。

        硅被認(rèn)定為植物的有益元素[7]。前人研究表明,施硅可促進(jìn)豇豆根系[8]及黃瓜幼苗[9]的生長。硅不僅影響植物的生長,還可顯著影響其發(fā)育進(jìn)程和產(chǎn)量品質(zhì)。施硅可顯著提高甘蔗干物質(zhì)質(zhì)量分?jǐn)?shù)和產(chǎn)量[10],還可通過調(diào)節(jié)水稻植株C/N值,改善初級代謝,提高水稻產(chǎn)量[11]。玉米施硅后,硝酸鹽水平降低,產(chǎn)量品質(zhì)均顯著提高[12]。硅尚未被證實是植物生長的必需營養(yǎng)元素,但逆境條件下其調(diào)控植物抗逆性的能力已被廣泛報道[13]。Zhu等[14]提出,施硅可作為一種提高植物抗旱性從而減輕干旱脅迫的負(fù)面影響的有效策略。硅可提高番茄對鹽脅迫的耐受性[15-16],筆者前期試驗,也證實硅能顯著提高番茄的抗旱能力[17]。因此,逆境條件下,硅對番茄抗逆能力的調(diào)控較為顯著。

        關(guān)于節(jié)水灌溉影響作物生理特性的研究,結(jié)論不盡相同[18-19]。一種觀點認(rèn)為,干旱脅迫可降低作物產(chǎn)量[20]。另一種觀點則認(rèn)為,適度干旱脅迫利于光合速率的提高,重度干旱脅迫才對光合不利[21]。光合作用是干物質(zhì)積累的核心,干物質(zhì)積累則是作物產(chǎn)量形成的基礎(chǔ)。盡管干濕交替灌溉可以充分發(fā)揮根區(qū)信號反饋控制,實現(xiàn)生理節(jié)水,但番茄對干濕交替的灌溉方式的響應(yīng)如何,且在該灌溉技術(shù)下施硅對番茄產(chǎn)量品質(zhì)有何影響,鮮見報道。由于硅在土壤中廣泛分布,為探明干濕交替條件下番茄的施硅效應(yīng),本課題組采用營養(yǎng)液水培方式,以自行設(shè)計的一種潮汐式灌溉試驗裝置模擬干濕交替的灌溉方式,研究干濕交替條件下施硅對番茄產(chǎn)量品質(zhì)形成的影響,為探索番茄灌溉新途徑及發(fā)展設(shè)施農(nóng)業(yè)高效節(jié)水栽培提供理論指導(dǎo)。

        1 材料與方法

        1.1 潮汐式灌溉試驗裝置

        設(shè)計1種虹吸式水培裝置(圖1):包含具有儲存營養(yǎng)液的水培殼的水培裝置本體、設(shè)置為與水培殼連通并且作用于水培殼的營養(yǎng)液虹吸排出的虹吸管道,通過虹吸管道,使水培殼的營養(yǎng)液進(jìn)行潮汐流動。

        注:1、2、3、4、5、6、7分別代表 PVC變徑管、“N”型虹吸管道、潛水泵、“U”型PVC管、定植孔方穴、定植孔、定植孔間隔。

        1.2 潮汐式灌溉試驗裝置設(shè)計關(guān)鍵

        潛水泵與安裝微電腦自動控時開關(guān)的電路相接,根據(jù)設(shè)定時間間歇通電供水。在出水口設(shè)計了“N”型虹吸管道(圖1b),當(dāng)U型PVC管栽培槽管道內(nèi)液位低于“N”型虹吸管道(圖2a),最高點時,“N”型虹吸管道的液面低于最高點,虹吸作用不發(fā)生,U型PVC管栽培槽管道內(nèi)可駐留液位較深的營養(yǎng)液;如圖(圖2b),當(dāng)U型PVC管栽培槽管道內(nèi)液位高于“N”型虹吸管道最高點時,“N”型虹吸管道的液面高于最高點,虹吸作用發(fā)生,將U型栽培槽內(nèi)的營養(yǎng)液逐漸排入貯液桶,實現(xiàn)植根部的水、氣相循環(huán),栽培槽管道末端設(shè)計了PVC變徑管,保持了管道底部有3~4 cm的淺液層,防止停電等短時性故障引起的供水不足,其工作原理是如圖(圖2c),在虹吸作用引起的栽培槽內(nèi)營養(yǎng)液回流過程的后期,由于在出液口處的栽培槽末端連接PVC變徑管,減小栽培槽的口徑,使出水口管道的下液面高于栽培槽管道的上液面,從而保障栽培槽有3~4 cm的淺液層,防止斷電等短時性故障的供水不足。

        圖2 “N”型虹吸管道工作原理

        1.3 試驗處理設(shè)計

        試驗在在山東農(nóng)業(yè)大學(xué)蔬菜試驗站日光溫室內(nèi)進(jìn)行。供試番茄品種為‘金棚1號’,用無硅水配制的Hoagland營養(yǎng)液水培育苗,于種子播后40 d后,將幼苗定植于PVC栽培槽內(nèi)繼續(xù)以營養(yǎng)液進(jìn)行水培,植株第4果穗坐果后打頂。試驗設(shè)3個處理,分別為:充分供水對照(CK)、干濕交替處理(T1)、干濕交替條件下施硅處理(T2),具體措施如表1。試驗用無硅水由廣東仟凈公司生產(chǎn),硅質(zhì)量分?jǐn)?shù)小于8.3×10-5mmol/L,所用硅源為Na2SiO3·9H2O,通過加入Na2SO4平衡不同處理營養(yǎng)液的Na+質(zhì)量分?jǐn)?shù)和滲透勢,營養(yǎng)液pH值用0.01 mol/L的H2SO4和NaOH調(diào)節(jié)至6.0左右。

        表1 試驗設(shè)計

        注:CK為充分供水對照;T1為干濕交替處理、T2為干濕交替條件下施硅處理,下同。

        Note: CK represents well-watered control; T1 represents dry-wet alternate treatment; T2 represents silicon fertilizer under dry-wet alternate treatment, the same below.

        1.4 測定項目和方法

        分別于種子播后40 d(幼苗期)、70 d(開花坐果期)、100 d(結(jié)果前期)、160 d(結(jié)果盛期)、190 d(結(jié)果后期)取樣,測定凈光合速率、蒸騰速率及植株耗水量,且每次取3~5株/小區(qū),將根、莖、葉、果分開,置干燥箱中105 ℃殺青30 min,75 ℃烘干至恒質(zhì)量稱量干質(zhì)量,并以Vorm法[22]測定其硅質(zhì)量分?jǐn)?shù)(以SiO2計)。

        每小區(qū)選取10株,自果實成熟采收始,分別計產(chǎn),直至拉秧。期間選取植株第2穗成熟果實各5個,以GY-3 型果實硬度計測定果實硬度;用阿貝折射儀測定可溶性固形物;滴定法測定可滴定酸;苯酚硫酸法測定可溶性糖;紫外吸收法測定可溶性蛋白;鉬藍(lán)比色法測定維生素C;茚三酮比色法測定游離氨基酸[23];石油醚浸提法測定番茄紅素[24]。

        1.5 數(shù)據(jù)處理

        采用Microsoft Excel 2010軟件對試驗數(shù)據(jù)進(jìn)行處理和繪圖,采用DPS 7.5軟件進(jìn)行統(tǒng)計分析,Duncan新復(fù)極差法進(jìn)行處理間差異顯著性檢驗。

        2 結(jié)果與分析

        2.1 干濕交替條件下硅對番茄不同器官硅質(zhì)量分?jǐn)?shù)的影響

        圖3表明,即使CK、T1處理的各器官也含一定量的硅,這與配制營養(yǎng)液的無硅水含少量硅有關(guān)。隨生長的進(jìn)行,CK、T1處理番茄各器官硅質(zhì)量分?jǐn)?shù)基本穩(wěn)定,T2處理則均呈逐漸升高的趨勢。因此,隨生長進(jìn)行,T2與CK、T1各器官中硅質(zhì)量分?jǐn)?shù)的差異逐漸加大,如幼苗期(40 d)T2根系硅質(zhì)量分?jǐn)?shù)分別較CK、T1高266%、309%,結(jié)果盛期(160 d)則分別高491%、539%。與CK相比,T2處理番茄根、莖、葉、果的硅質(zhì)量分?jǐn)?shù)的最大增幅分別可達(dá)494%、444%、246%、631%。同一處理番茄植株硅質(zhì)量分?jǐn)?shù)以果實和莖較低,根次之,葉片較高,這與蒸騰作用引起番茄植株體內(nèi)硅的末端集聚相關(guān)[25]。

        注:不同字母表示處理間差異達(dá)5%顯著水平,下同。

        2.2 干濕交替條件下硅對番茄植株生長影響

        從圖4可以看出,在開花坐果期(70 d),T1處理的株高略低于CK,而T2處理的株高顯著高于CK;在結(jié)果前期至結(jié)果后期(100~190 d)T1、T2處理的株高均低于CK。T1處理的莖粗在開花坐果期至結(jié)果前期(70~100 d)高于CK,但隨生長的進(jìn)行,這種差異減弱,而T2處理的莖粗除幼苗期(40 d)一直顯著高于CK。T1、T2處理的根干質(zhì)量、莖干質(zhì)量、葉干質(zhì)量在開花坐果期(70 d)較CK有所增加,且在結(jié)果前期(100 d)T1、T2處理的根干質(zhì)量、葉干質(zhì)量仍高于CK,但至結(jié)果盛期(160 d)及結(jié)果后期(190 d)T1、T2處理的根干質(zhì)量、葉干質(zhì)量、果干質(zhì)量則較CK有所降低。在株高、莖粗、根干質(zhì)量、莖干質(zhì)量、葉干質(zhì)量及果干質(zhì)量方面,盡管T1、T2處理與CK的差異呈現(xiàn)階段性變化,但從開花坐果期(70 d)至結(jié)果后期(190 d),T2處理在一些指標(biāo)上顯著高于T1處理,在其他指標(biāo)也與T1處理無明顯差異。以上數(shù)據(jù)表明,在番茄生長發(fā)育前期(0~70 d)干濕交替處理可降低番茄株高,卻促進(jìn)其莖粗加及各器官干質(zhì)量的增加,從而起到控制長勢,培育壯苗的作用,但在生長發(fā)育后期(160~190 d)顯著抑制番茄植株生物量的增加。在生長發(fā)育前期(0~70 d),干濕交替條件下施硅顯著促進(jìn)番茄生物量的增加;在生長發(fā)育后期(160~190 d)則可以降低干濕交替對番茄植株生物量的抑制作用。

        圖4 不同處理下番茄生物量

        2.3 干濕交替條件下硅對番茄光合作用及水分利用的影響

        圖5表明,整個生育期各處理的凈光合速率(Pn)、蒸騰速率(Tr)和耗水量均先升高后降低,且以100 d和160 d時最高。在開花坐果期(70 d),T2處理的Pn略高于CK,但之后T1、T2處理的Pn均較CK降低。開花坐果期(70 d)至結(jié)果后期(190 d),T1、T2處理的Tr均顯著低于CK處理,但T2處理的Tr顯著高于T1處理。開花坐果期(70 d)至結(jié)果后期(190 d),盡管T1、T2處理的耗水量也顯著低于CK處理(除了70 d T2處理),但開花坐果期至結(jié)果前期(70~100 d)T1、T2間并無顯著差異,結(jié)果盛期至結(jié)果后期(160~190 d),T1、T2間差異顯著,并在結(jié)果后期(190 d)時T1、T2處理分別較CK節(jié)水51%、23%。

        2.4 干濕交替條件下硅對番茄坐果特性及產(chǎn)量的影響

        不同處理番茄坐果特性及產(chǎn)量有顯著差異。如圖6所示單株總果數(shù)以T2處理最高,T1處理次之,CK處理最低。由于T1處理的單果質(zhì)量低于CK,T1番茄單株產(chǎn)量較CK降低49%,差異顯著,盡管T2處理的單果質(zhì)量也低于CK,但由于其單株總果數(shù)顯著高于CK,其單株產(chǎn)量較CK降低僅15%。表明干濕交替促進(jìn)坐果數(shù)增加,但單果質(zhì)量較低,從而導(dǎo)致減產(chǎn),施硅可顯著減弱干濕交替條件下番茄的減產(chǎn)效應(yīng)。

        2.5 干濕交替條件下硅對番茄品質(zhì)的影響

        不同處理番茄果實品質(zhì)也有顯著差異。從表2可以看出,與CK相比,T1、T2處理的果實品質(zhì)在可溶性固形物質(zhì)量分?jǐn)?shù)、可溶性蛋白質(zhì)量分?jǐn)?shù)、可溶性糖質(zhì)量分?jǐn)?shù)、糖酸比、果實硬度方面呈增高趨勢,但在番茄紅素質(zhì)量分?jǐn)?shù)、維生素C質(zhì)量分?jǐn)?shù)方面卻呈現(xiàn)降低趨勢。此外,T2處理的的番茄紅素質(zhì)量分?jǐn)?shù)、可溶性蛋白質(zhì)量分?jǐn)?shù)、游離氨基酸顯著高于T1,但其糖酸比顯著低于T1。表明,干濕交替可引起番茄果實中部分營養(yǎng)物質(zhì)的不同程度地增加或降低,如糖酸比提高了30%,番茄紅素則降低了32%,而施硅后可抑制干濕交替引起的部分品質(zhì)指標(biāo)的下降,甚至進(jìn)一步促進(jìn)番茄果實部分品質(zhì)指標(biāo)的增加。

        圖5 不同處理下番茄的凈光合速率(Pn)、蒸騰速率(Tr)及耗水量

        圖6 不同處理下番茄坐果特性及產(chǎn)量

        表2 不同處理下番茄的果實品質(zhì)

        3 討 論

        由于番茄吸硅速率慢于吸水速率,且莖傷流液硅濃度低于外部培養(yǎng)液,因此認(rèn)為番茄屬硅排斥吸收類型。然而,Nikolic等[26]研究發(fā)現(xiàn),硅以被動擴(kuò)散方式隨質(zhì)流進(jìn)入番茄根部皮層,通過運(yùn)載體介導(dǎo)進(jìn)入質(zhì)外體,故番茄能夠積累一定量的硅。本試驗結(jié)果表明,隨營養(yǎng)液加硅顯著促進(jìn)番茄植株根、莖、葉、果中硅質(zhì)量分?jǐn)?shù)的增加,且隨生長進(jìn)行,各器官含硅量均呈增加的趨勢,這與梁永超等[27]和Heine等[28]在番茄上的研究結(jié)果一致。此外,Jone s等[29]研究表明,禾谷類作物硅沉積量依次為花序>葉片>葉鞘>莖稈>地下部;與此不同,本研究證實,番茄植株的硅質(zhì)量分?jǐn)?shù)以葉片及根系較高,果實及莖則較低。這與非洲草、生姜中各器官硅質(zhì)量分?jǐn)?shù)的分配特性相一致[30-31]。

        根區(qū)控制性干濕交替灌溉的理論基礎(chǔ)是,當(dāng)植物根系遭受一定程度的干旱脅迫則產(chǎn)生根源信號ABA,進(jìn)行地上部氣孔調(diào)節(jié),從而降低蒸騰但不降低光合作用,實現(xiàn)節(jié)水的目的[32-34]。本試驗研究的結(jié)果表明,生長發(fā)育前期(0~70 d),干濕交替條件下番茄植株的蒸騰速率降低,但光合作用并未降低。這可解釋為干濕交替的方式使耗水過程趨于平緩,在番茄生長發(fā)育前期(0~70 d),番茄需水量較小,有利于控制植株長勢、壯大莖稈直徑,以及促進(jìn)根系的生長,從而維持較高的光合性能。在生長發(fā)育中后期(100~190 d),盡管單純干旱交替處理的節(jié)水效果尤為顯著,但卻造成番茄植株的生物量及果實產(chǎn)量的顯著降低,為保證灌溉效果和效益,單純干濕交替的灌溉方式則不宜采用。筆者前期試驗證實,干旱脅迫條件下施硅能顯著提高番茄葉片水分,降低光合色素的降解,提高葉片色素光化學(xué)效率,減輕光抑制程度,從而維持較高的光合速率[35],且能提高根系葉片的氧化損傷[17]。本研究進(jìn)一步證實,硅促進(jìn)番茄植株各器官硅質(zhì)量分?jǐn)?shù)的增加,緩解干濕交替條件下光合速率的下降,減弱干濕交替條件下番茄產(chǎn)量的降低,并實現(xiàn)節(jié)水23%的效果。

        除了產(chǎn)量,品質(zhì)也是影響作物經(jīng)濟(jì)效益的關(guān)鍵指標(biāo)。張國芹等[36]研究表明,生姜施硅后,根莖中可溶性蛋白、可溶性糖、VC、游離氨基酸均高于對照。季明德等[37]研究證實,硅可促進(jìn)甘蔗葉片蔗糖的合成和分解,有利于糖分的積累。Lee等[38]研究認(rèn)為,硅增強(qiáng)了番茄蔗糖合成酶和蔗糖磷酸合成酶的活性。此外,施硅還提高了番茄維生素C和可溶性固形物質(zhì)量分?jǐn)?shù)[39],增加了果實硬度和番茄紅素質(zhì)量分?jǐn)?shù)[40]。本試驗研究表明,干濕交替造成了番茄的嚴(yán)重減產(chǎn)及部分品質(zhì)指標(biāo)的下降,但顯著提高番茄果實的其他品質(zhì)指標(biāo),尤其糖酸比最為顯著。施硅后可抑制干濕交替引起的部分品質(zhì)指標(biāo)的下降,甚至進(jìn)一步促進(jìn)番茄果實部分品質(zhì)指標(biāo)的增加,尤以番茄果實硬度及番茄紅素增加最為顯著,這可能與硅大多沉積于細(xì)胞壁,提高了細(xì)胞壁抵抗外力的作用[41],并通過紅外熱輻射防止高溫灼傷果實,有利于番茄紅素的形成有關(guān)[42]。因此,盡管施硅并未完全逆轉(zhuǎn)干濕交替對番茄生長發(fā)育中后期(100~190 d)的生長及部分品質(zhì)指標(biāo)的抑制作用,但干旱交替下施硅可綜合干旱交替灌溉對作物本身抗旱節(jié)水能力的挖掘及硅提高作物抗旱性兩方面的優(yōu)勢,在促進(jìn)番茄穩(wěn)產(chǎn)優(yōu)質(zhì)協(xié)調(diào)形成的前提下,節(jié)水效果較好。

        4 結(jié) 論

        干濕交替措施應(yīng)用于番茄栽培可行與否,須結(jié)合不同的生育期綜合考慮,不能一概而論。在番茄生長發(fā)育前期(0~70 d),番茄生長需水量相對較小,干濕交替的措施在實現(xiàn)節(jié)水的同時,利于培育壯苗。但生長發(fā)育后期(100~190 d),尤其盛果期,番茄生長需水量較大,盡管干濕交替措施能可在一定程度上實現(xiàn)番茄品質(zhì)的改善,但易造成嚴(yán)重減產(chǎn)。而干濕交替條件下施硅可綜合干濕交替的節(jié)水效能和外源硅提高番茄抗性的調(diào)控效應(yīng),在實現(xiàn)節(jié)水23%的同時,促進(jìn)番茄穩(wěn)產(chǎn)優(yōu)質(zhì)協(xié)調(diào)形成。

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        [42] 王荔軍,李敏,李鐵津,等. 植物體內(nèi)的納米結(jié)構(gòu)SiO2[J]. 科學(xué)通報,2001,46(8):625-632.

        Wang Lijun, Li Min, Li Tiejin, et al. 2001 The nano structure of plants SiO2[J]. Chinese Science Bulletin, 2001, 46(8): 625-632. (in Chinese with English abstract)

        曹逼力,張志煥,徐 坤. 施硅提高干濕交替條件下番茄節(jié)水性及產(chǎn)量和品質(zhì)[J]. 農(nóng)業(yè)工程學(xué)報,2017,33(22):127-134. doi:10.11975/j.issn.1002-6819.2017.22.016 http://www.tcsae.org

        Cao Bili, Zhang Zhihuan, Xu Kun. Silicon improving water conservation, yield and quality of tomato under alternate wetting and drying condition[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2017, 33(22): 127-134. (in Chinese with English abstract) doi:10.11975/j.issn.1002-6819.2017.22.016 http://www.tcsae.org

        Silicon improving water conservation, yield and quality of tomato under alternate wetting and drying condition

        Cao Bili, Zhang Zhihuan, Xu Kun※

        (,,271018,)

        Silicon plays an important role in improving crop drought resistance. The irrigation of alternate wetting and drying condition is a method that can achieve the goal of saving water resources and increasing production, through the inducement of the drought regulation potential by exposure of the plant roots to drought stress. Signal feedback control in the root zone can be performed adequately under alternate wetting and drying condition, and therefore physiological water conservation can be achieved. However, the conclusions on the effects of water-saving irrigation on the physiological characteristics of crops are different. With regard to the research about applicability of alternative irrigation method on tomato (.) cultivation. In order to investigate the impacts of application of exogenous silicon on tomato under alternate wetting and drying condition, the effects of silicon on the silicon mass fraction in plant, plant growth, fruit yield and quality of tomato under alternate wetting and drying condition simulated. The simulation system was achieved by the use of a self-designed ebb-and-flow irrigation system. The results showed that the application of exogenous silicon in culture solution resulted in the increase of silicon mass fraction in tomato plants. The silicon mass fraction of tomato roots, stems, leaves and fruits increased by 494%, 444%, 246% and 631%, respectively. During the period of seedling stage and the period of flowering and fruit bearing stage of tomato, the irrigation of alternate wetting and drying condition can be used to control the growth and nurture strong seedlings. From the period of early fruiting stage to the period of later fruiting stage of tomato, especially fruit flourish stage, it is not appropriate to use the irrigation of alternate wetting and drying condition. Dry and wet alternation resulted in a serious decline in tomato production and a decline in lycopene mass fraction, vitamine C mass fraction, titratable acid mass fraction, but significantly improved other quality indicators of tomato fruit, such as soluble protein mass fraction, free amino acids mass fraction, soluble solid mass fraction, soluble sugar mass fraction, titratable acid mass fraction, fruit rigidity, sugar-acid ratio. Especially, sugar and acid ratio increased by 30%. The application of exogenous silicon can alleviate the adverse effects of alternate wetting and drying condition on fruit yield and quality in the late growth and development period of tomato. To this end, the combination of the irrigation of alternate wetting and drying condition and the application of exogenous silicon, in the promotion of stable production of tomatoes under the premise of high quality, can cause water conservation up to 23%. Based on this study, how exogenous silicon regulated the yield and quality of tomato under the condition of alternate wetting and drying was investigated, and the role of exogenous silicon in mediating changes of some physiological parameters of tomato planted under variable water conditions was made a thorough inquiry. The theoretical contents that refer to how exogenous silicon improved plant drought resistance were expanded. Irrigation method of alternate wetting and drying condition in tomato water-saving cultivation was further optimized. The result of this paper is of great significance to a reasonable water saving and to the improvement of the commodity rate of tomato.

        silicates; irrigation; furits; dry and wet alternate conditions; yield; quality

        10.11975/j.issn.1002-6819.2017.22.016

        S641.2; S606+.2

        A

        1002-6819(2017)-22-0127-08

        2017-06-20

        2017-10-14

        山東果蔬優(yōu)質(zhì)高效生產(chǎn)協(xié)同創(chuàng)新中心引導(dǎo)性課題;山東省現(xiàn)代農(nóng)業(yè)產(chǎn)業(yè)技術(shù)創(chuàng)新體系專項資金(SDAIT05-05);“雙一流”獎補(bǔ)資金資助(SYL2017YSTD06)。

        曹逼力,講師,主要從事蔬菜栽培生理生態(tài)研究。 Email:bilicao@sdau.edu.cn.通信作者:徐 坤,教授,主要從事蔬菜栽培生理生態(tài)研究。 Email:xukun@sdau.edu.cn.

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