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膨果期施用磷鉀肥對(duì)油茶果實(shí)和花芽生長(zhǎng)發(fā)育的影響

2025-08-13 00:00:00曹春芮韓海琦鐘德松李書蘋王東雪江澤鵬王勁松
關(guān)鍵詞:縱徑花芽磷肥

中圖分類號(hào):S725.5 文獻(xiàn)標(biāo)志碼:A

Abstract: 【Objective】 Camellia oleifera is a plant of Camellia genus in Theaceae family, which is rich in nutrients and has a wide range ofutilization,and is a very important woody oil tree species.The problems offalling flowers and fruits,as well as low yield,are the key factors restricting the high-yield and eficient development of C .oleifera industry. This study aimed to investigate the effects of different phosphorous and potassium fertilization treatments done at the fruit expanding stage on the fruit and flower bud growth and development of C .oleifera,in order to a provide reference for scientific fertilization to improve C. oleifera yield.【Method】 The C oleifera variety Cenruan 3 was selected as the experimental plant material in this study. Different phosphorus and potassium fertilization amount treatments were set and applied at the fruit enlargement stage.No fertilization treatment was used as the control. Four levels of KH2PO4 (purity 99% ,containing P2O5 52% and K2O 34% )treatments included A1, 250g/plant ; A2, 500g/plant ; A3, 750g/plant ; and A4, 1000g/plant ,and 4 levels of commercial phosphate fertilizer(available P2O5?16% ) + potassium fertilizer ( K2O?52% )treatments included B1, 125g/ plantof phosphate fertilizer+125 g/plant of potassium fertilizer;B2, 250g/Ω plant of phosphate fertilizer +250g/ plant of potassium fertilizer; B3, 375g/ plantof phosphate fertilizer +375g/ plant of potassium fertilizer;and B4, 500g/Ω plant of phosphate fertilizer + 500g/Ω plantof potassium fertilizer.The agronomic traits including the number of fruits,transverse and longitudinal diameter,and single fruit mass were investigated before fertilization and after fruit ripening,and the fruit retention rate and fruit shape index were calculated. 【Result】The results indicated that in terms of the effect on fruit retention rate,the treatment B4 was thebest,whichfruit retentionratereached 60.15% andwas 152.73% higher than that in the control, and it could also enhance the fruit transverse and longitudinal diameter. Regarding the effects on fruit economic traits,treatment A4 could better promote fruit growth and quality,which showed significantly higher single fruit mass and fruit shape index compared to the control;the fresh and dry seed yields,and dry kernel yield in treatment B1 were all higher than those in the control. In terms of the effects on flower bud plumpness,the treatment A2 ( KH2PO4500g )presented the most favorable results,the length,width,thickness,mass,and volume of flower buds were 14.56mm , 7.71mm , 7.27mm , 4.35g ,and 2.17mm3 ,respectively,which were 10.64% , 0.78% , 12.71% , 11.25% ,and 1.88% , respectively, higher than those in the control. 【Conclusion】Appropriate application of phosphorus and potassum fertilizers at the fruit expanding stage significantly improved the fruit retention rate,economic traits and plumpness of flower buds in C .oleifera.Overall, the treatment B4 ( 500g/ plant of phosphate fertilizer +500g/ plant of potassium fertilizer) had the best effect.

Keywords: Camellia oleifera; fruit retention rate; fruit economic traits;plumpness of flowerbuds

0 引言

【研究意義】油茶(Camelliaoleifera)是山茶科山茶屬小喬木或灌木狀植物,與油橄欖、油棕、椰子并稱為世界四大木本油料樹(shù)種(彭邵鋒等,2012),有“東方橄欖油”的美稱(莊瑞林,

2008),具有豐富的營(yíng)養(yǎng)元素和廣泛的用途,主要生長(zhǎng)在中國(guó)南方亞熱帶地區(qū)的高山及丘陵地帶。油茶果實(shí)生長(zhǎng)根據(jù)其發(fā)育特點(diǎn)大致分為以下4個(gè)重要生長(zhǎng)時(shí)期:幼果形成期(3月以前)、果實(shí)生長(zhǎng)期(3一8月)、油脂轉(zhuǎn)化期(8月下旬一10月)和果熟期(陳永忠等,2006;莊瑞林,2008)。近年來(lái),油茶產(chǎn)業(yè)發(fā)展迅速,在我國(guó)生態(tài)經(jīng)濟(jì)建設(shè)中占有重要地位,但生產(chǎn)中存在落花落果、產(chǎn)量低等問(wèn)題,是制約油茶產(chǎn)業(yè)高產(chǎn)高效發(fā)展的關(guān)鍵因素(黃安香等,2023)。廣西作為全國(guó)油茶主產(chǎn)區(qū)之一,采取有效手段提高油茶產(chǎn)量對(duì)油茶產(chǎn)業(yè)發(fā)展具有重要意義。【前人研究進(jìn)展】油茶是一種重要的經(jīng)濟(jì)作物,其生長(zhǎng)發(fā)育與營(yíng)養(yǎng)物質(zhì)供應(yīng)密切相關(guān),施肥不僅能促進(jìn)其花芽分化與生長(zhǎng),還能促進(jìn)其果實(shí)的發(fā)育與形成,進(jìn)而提高其產(chǎn)量與抗逆性(曹永慶等,2012)。有研究表明,油茶林地施用五氧化二磷( P2O5 )可獲得較好的產(chǎn)量(ZHANGetal.,2021)。鄭顓(2020)研究發(fā)現(xiàn),噴施 0.3%~0.5% 的硼肥有利于提高油茶的坐果率,增加產(chǎn)量。姜佳艷等(2022)發(fā)現(xiàn),氮肥對(duì)油茶株高、南北冠幅、單果質(zhì)量影響較大,鉀肥對(duì)地徑增長(zhǎng)、結(jié)果數(shù)量、單果質(zhì)量及出仁率影響較大;有機(jī)肥對(duì)東西冠幅、施肥當(dāng)年油茶產(chǎn)量、茶籽質(zhì)量、茶籽含水率及含油率影響較大;磷肥對(duì)油茶產(chǎn)量和結(jié)果數(shù)量影響較大。【本研究切入點(diǎn)】前人的研究雖然為油茶施肥管理提供了理論基礎(chǔ),但大多集中在油茶整個(gè)生長(zhǎng)發(fā)育期的施肥管理,針對(duì)油茶膨果期施肥研究相對(duì)較少。【擬解決的關(guān)鍵問(wèn)題】本試驗(yàn)綜合考慮油茶膨果期對(duì)營(yíng)養(yǎng)元素的需求,補(bǔ)充磷肥、鉀肥,通過(guò)設(shè)置不同肥料及用量梯度,量化分析膨果期施用磷鉀肥處理對(duì)油茶果實(shí)和花芽生長(zhǎng)發(fā)育的影響,明確膨果期最佳施用磷鉀肥用量,以期為油茶生產(chǎn)合理施肥,促進(jìn)油茶產(chǎn)業(yè)高質(zhì)量發(fā)展提供科學(xué)依據(jù)。

1 材料與方法

1.1 試驗(yàn)地概況

試驗(yàn)地位于來(lái)賓市興賓區(qū)鳳凰鎮(zhèn)廣西壯族自治區(qū)國(guó)有維都林場(chǎng)雅江分場(chǎng)( E109°33 , N23° 86),屬亞熱帶季風(fēng)氣候,雨量充沛,光照時(shí)間長(zhǎng),年平均氣溫 20.7°C ,年平均日照 1750h ,年無(wú)霜期327d,平均年降水量 1 370mm 。大部分林地土層深厚,土壤肥沃,多為赤紅壤, pH4.44 ,有機(jī)質(zhì)含量 22.13g/kg ,全氮含量 1.37g/kg ,全磷含量 0.42g/kg ,全鉀含量 6.34g/kg ,適合油茶生長(zhǎng)。

1.2 試驗(yàn)材料

試驗(yàn)樹(shù)體為雅江分場(chǎng)內(nèi)葉色濃綠、花芽多、長(zhǎng)勢(shì)較好的岑軟3號(hào)無(wú)性系成年植株,種植時(shí)間為2011年,株行距 2m×3m 。試驗(yàn)開(kāi)展時(shí)間為2022年7一11月,肥料為市場(chǎng)購(gòu)買的磷酸二氫鉀( KH2PO4 純度 99% ,含 P2O552% , K2O 34% 、磷肥(有效 P2O5gtrsim16% )和鉀肥( K2O?52% )。

1.3 試驗(yàn)設(shè)計(jì)

如表1所示,設(shè)置在膨果期不施肥為試驗(yàn)對(duì)照(CK),施用 KH2PO4 或者磷肥 + 鉀肥為試驗(yàn)處理,每種施肥處理設(shè)置4個(gè)梯度,3次重復(fù),每個(gè)重復(fù)3株樹(shù)。施肥時(shí)間為2022年7月中旬,采用溝施法,沿油茶冠幅滴水線外沿挖長(zhǎng) 50cm 、寬 20cm 、深20cm 的弧形溝。

1.4 指標(biāo)測(cè)定

施肥前每株選取2~3枝標(biāo)準(zhǔn)枝,每枝果實(shí)數(shù)不低于30個(gè),掛牌標(biāo)記,調(diào)查果實(shí)數(shù),同時(shí)測(cè)量果實(shí)縱徑、果實(shí)橫徑,每枝測(cè)3個(gè)果,施肥后每隔10d測(cè)量1次,直至果實(shí)膨大期結(jié)束。果實(shí)成熟后再次調(diào)查掛牌枝條上的果實(shí)數(shù),并計(jì)算保果率(最后保存的果實(shí)數(shù)占施肥前總數(shù)的百分比)。每株油茶樹(shù)采摘30個(gè)果實(shí),分株掛標(biāo)簽,帶回實(shí)驗(yàn)室測(cè)定果實(shí)經(jīng)濟(jì)性狀,于采摘當(dāng)天稱取鮮果質(zhì)量,剝離鮮果的果皮和籽后稱量鮮籽質(zhì)量,計(jì)算鮮出籽率(鮮籽質(zhì)量占鮮果總質(zhì)量的百分比),將鮮籽烘至恒定質(zhì)量,稱取其質(zhì)量,計(jì)算干出籽率(干籽質(zhì)量占鮮果總質(zhì)量的百分比),然后將干籽剝殼,取出種仁,計(jì)算干出仁率(干仁質(zhì)量占干籽總質(zhì)量的百分比)。分不同處理從標(biāo)準(zhǔn)枝外采集花芽,并用游標(biāo)卡尺測(cè)定花芽的長(zhǎng)度、寬度、厚度。

表1油茶施肥配比試驗(yàn)組合設(shè)計(jì) Table1Designoffertilizer combinations indifferent proportional fertilization tests forC.oleifera

注:“-\"表示不施該種肥料。Note:“-”indicated not to apply this fertilizer.

果實(shí)縱徑、橫徑增長(zhǎng)率: A=(B-C)/C×100%

式中, B 為果實(shí)成熟后測(cè)量的果實(shí)縱徑、果實(shí)橫徑;C為施肥前測(cè)量的果實(shí)縱徑、果實(shí)橫徑。

花芽質(zhì)量的稱量:取枝條頂部花芽,每10個(gè)花芽為一組,用電子天平稱量其總質(zhì)量,即可知平均每個(gè)花芽的質(zhì)量。

花芽體積的測(cè)量: 10mL 量筒里加入 5mL 水,隨機(jī)挑選5個(gè)花芽為一組,量筒里的水改變量即為5個(gè)花芽的體積,即可知平均每個(gè)花芽的體積。

果形指數(shù) °leddash 果實(shí)縱徑/果實(shí)橫徑。

1.5 數(shù)據(jù)處理

采用MicrosoftExcel對(duì)所有數(shù)據(jù)進(jìn)行處理及作圖,用統(tǒng)計(jì)軟件SPSS27.0對(duì)數(shù)據(jù)進(jìn)行方差分析,并用Duncan法進(jìn)行多重比較。

2 結(jié)果與分析

2.1不同磷鉀肥處理對(duì)油茶保果率的影響

方差分析結(jié)果(圖1)表明,不同處理之間油茶保果率存在顯著差異,說(shuō)明不同施肥種類及用量對(duì)油茶的保果率有顯著的影響。各個(gè)施肥處理的保果率為 B4gt;B1gt;A4gt;B3gt;A3gt;A2gt;A1gt; B2gt;CK ,其中A4、B1、B3、B4處理的顯著高于對(duì)照;以處理B4植株的保果率最高,達(dá) 60.15% ,比對(duì)照的 23.80% 提高了 152.73% 。

2.2不同磷鉀肥處理對(duì)油茶果實(shí)大小的影響

由圖2可知,膨果期不同磷鉀肥處理對(duì)油茶果實(shí)縱徑增長(zhǎng)率的影響顯著, B1gt;B4gt;A1gt;A2gt; A4gt;B3gt;B2gt;CKgt;A3 ;其中A1、A2、B1、B4處理的顯著高于對(duì)照,以處理B1植株的最高,達(dá)39.39% ,比對(duì)照的 28.53% 提高了 38.07% 。從圖3可知,膨果期不同磷鉀肥處理對(duì)油茶果實(shí)橫徑增長(zhǎng)率的影響只有B4的顯著高于對(duì)照,達(dá) 46.88% ,比對(duì)照的 34.88% 提高了 34.40% ,其余處理的與對(duì)照差異不顯著。

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2.3不同磷鉀肥處理對(duì)油茶果實(shí)經(jīng)濟(jì)性狀的影響

不同磷鉀肥處理油茶果實(shí)經(jīng)濟(jì)性狀的方差分析結(jié)果表明,不同處理間果實(shí)經(jīng)濟(jì)性狀均存在顯著差異(表2)。各處理的單果質(zhì)量為 18.19~23.26g ,果形指數(shù)為 0.94~1.01 ,均以處理A4最大,分別比對(duì)照提高了 25.19% 、 4.12% ,可見(jiàn)該處理不僅促進(jìn)了油茶果實(shí)的生長(zhǎng),還使得果形更加飽滿,提高了果實(shí)的整體品質(zhì)。各處理的果皮厚度為 3.92~ 4.57mm ,以處理B3的果皮最薄,顯著比對(duì)照的薄;處理A4的最厚,A1、B1、A3的也顯著厚于對(duì)照的。從籽粒數(shù)情況來(lái)看,由多到少排序依次為 A1gt;B1gt;A3gt;A4gt;B2gt;B3gt;B4gt;A2gt;CK 各施用磷鉀肥處理的油茶果籽粒數(shù)分別比對(duì)照的提高了 26.02% , 22.36% 、 17.07% 、 13.01% 、 7.72% 7.72% 7.32% 、 6.91% ,其中A1、B1與CK的差異達(dá)顯著水平。處理B3的鮮出籽率最高,比對(duì)照的顯著提高了 2.14% ,A2和B2的也顯著高于對(duì)照的,A4和B4的則顯著低于對(duì)照的。處理B1的總干籽質(zhì)量、總干仁質(zhì)量、干出籽率均最高,分別比對(duì)照的高 32.39% 、 32.63%g 、 12.08% ;除B2、B4外,其余處理的總干籽質(zhì)量顯著高于對(duì)照的;B1、B3、A2的干出籽率顯著高于對(duì)照的,A3、A4、B4的干出籽率則低于對(duì)照的。干出仁率除處理B1的略高于對(duì)照外,其余處理均顯著比對(duì)照的低。

2.4不同磷鉀肥處理對(duì)油茶花芽飽滿度的影響

用SPSS27.0軟件對(duì)油茶花芽的質(zhì)量、體積、長(zhǎng)度、寬度、厚度等數(shù)據(jù)進(jìn)行分析,得到油茶花芽體積、質(zhì)量的回歸方程如下: V(mm3)=-0.060+ 0.001x+0.296y-0.011z , R=0.536 ; M(g)=L-0.178+ 0.001x+0.376y+0.202z , R=0.562 ;其中 V 、M、 x 、y、z、 R 分別表示花芽體積、質(zhì)量、長(zhǎng)度、寬度、厚度、方程擬合度。將不同處理下測(cè)定的花芽長(zhǎng)度、寬度、厚度數(shù)據(jù)代入到以上方程,可得到該處理下的體積和質(zhì)量。通過(guò)對(duì)不同磷鉀肥處理油茶花芽飽滿度的相關(guān)指標(biāo)進(jìn)行方差分析,發(fā)現(xiàn)不同處理間花芽的質(zhì)量、體積、長(zhǎng)度、寬度、厚度均存在顯著差異。如表3所示,各施肥處理均顯著提高了油茶花芽的長(zhǎng)度和厚度,總體來(lái)看,A1、A2、A3、A4處理比B1、B2、B3、B4處理的促進(jìn)作用更強(qiáng)。從油茶花芽的質(zhì)量、體積、長(zhǎng)度、寬度、厚度來(lái)看,處理A2表現(xiàn)最好,所有指標(biāo)均顯著高于對(duì)照,其花芽長(zhǎng)度、寬度、厚度、質(zhì)量、體積分別比對(duì)照的提高了 10.64% 、 0.78% 、 12.71% 、11.25% 、 1.88% 。

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3 討論

在油茶的生長(zhǎng)過(guò)程中,對(duì)氮、磷、鉀元素的需求量是最大的,特別是在果實(shí)膨大期,處于油脂合成的關(guān)鍵時(shí)期,對(duì)磷和鉀的需求量很大(彭邵鋒等,2015),磷和鉀能增強(qiáng)油茶的光合作用,提高油茶的出油率,從而實(shí)現(xiàn)增產(chǎn)增收(游璐等,2014;朱昶等,2023)。

油茶的最終產(chǎn)量取決于花期保花率以及果期保果率,果實(shí)橫、縱徑則是衡量油茶生長(zhǎng)狀況和產(chǎn)量的重要指標(biāo)。本研究發(fā)現(xiàn),在油茶膨果期適當(dāng)施用磷鉀肥可有效提升油茶保果率,說(shuō)明施肥能促進(jìn)油茶樹(shù)體內(nèi)養(yǎng)分含量提高,促進(jìn)油茶生殖生長(zhǎng)。這與劉會(huì)云等(2022)報(bào)道磷酸二氫鉀對(duì)油茶花粉萌發(fā)、維持柱頭可授性、降低落花率及提高保果率均有促進(jìn)作用的結(jié)論相一致。綜合本研究的結(jié)果,處理B4的保果率最高,比對(duì)照的提高了 152.73% ,且有效增加了油茶果實(shí)橫、縱徑。處理A4、A3對(duì)單果質(zhì)量有明顯促進(jìn)作用。對(duì)不同處理的油茶果形指數(shù)進(jìn)行分析,結(jié)果表明所有油茶果實(shí)均呈球形,與彭邵鋒(2007)、張守科(2020)的結(jié)論一致。鮮出籽率和干出仁率是體現(xiàn)油茶生產(chǎn)能力的重要指標(biāo)。在本研究中鮮出籽率較高的是處理B3、B2、A2,顯著高于CK,而干出仁率較高的是B1和CK,這可能與不同處理對(duì)油茶籽內(nèi)部結(jié)構(gòu)和成分的影響有關(guān),需要進(jìn)一步研究。油茶花芽飽滿度主要通過(guò)花芽質(zhì)量、體積、長(zhǎng)度、寬度、厚度等指標(biāo)來(lái)考察(溫玥等,2015)。本研究的結(jié)果表明,施用 KH2PO4 效果優(yōu)于磷肥 + 鉀肥,可能是因?yàn)榱姿岫溻浫芙夂筢尫潘傩Я租涬x子 (H2PO4-"、 K+"),快速被根系吸收,促進(jìn)花芽?jī)?nèi)部雄蕊、雌蕊發(fā)育均衡,減少畸形花,從而提高開(kāi)花整齊度和花芽飽滿度。

表2不同磷鉀肥處理的油茶果實(shí)經(jīng)濟(jì)性狀

Table2Economic traits in C.oleifera fruit in different phosphate and potassium fertilization treatments

注:表中數(shù)值為平均值±標(biāo)準(zhǔn)誤;同列數(shù)據(jù)后的不同小寫字母表示處理間差異顯著 (Plt;0.05)CK ,對(duì)照;A1, KH2PO4 250g/株; A2,KH2PO4 500g/ 株;A3,(20 KH2PO4 750g/株;A4, KH2PO4 1000g/ 株;B1,磷肥125g/株+鉀肥125g/株;B2,磷肥250g/株+鉀肥 250g/Ω 株;B3,磷肥375g/株+鉀肥375 g/ 株;B4,磷肥500g/株+鉀肥 500g/ 株。

Note:The values in the table were mean ± standard error.Different lowercase lettrsafterdata inthe same column indicated significant differences (Plt;0.05 among treatments.CK,control;A1, KH2PO4 250 g/plant;A2, KH2PO4500 g/plant; A3, KH2PO4750 g/plant;A4, KH2PO41000 g/plant;B1,125g/plant of phosphate fertilizer + 125g/plantof potassiumfertilizer;B2,250 g/plant of phosphatefertilizer + 250g/plantofpotassiumfertilizer;B3,375g/plantofphosphatefertilizer + 375g/plant of potassium fertilizer;B4,500 g/plant of phosphate fertilizer +500 g/plant of potassium fertilizer.

表3不同磷鉀肥處理下油茶花芽飽滿度

Table3Plumpnessofflower bud in C.oleifera in different phosphate and potassium fertilization treatments

注:表中數(shù)值為平均值±標(biāo)準(zhǔn)誤;同列數(shù)據(jù)后的不同小寫字母表示處理間差異顯著 (Plt;0.05 。CK,對(duì)照; Al,KH2PO4 250g 株;A2,KHPO4 500g/ 株;A3,KHPO4750g/株;A4,KHPO10g/株;B1磷肥125g/+鉀肥125g/株;B2磷肥250g/+鉀肥250g/株;B3,磷肥375g/+鉀肥375g/株;B4,磷肥50g/肥500g/株。

Note:The values in the table were mean ± standard error.Differentlowercase lettrsafterdata inthe same column indicated significant differences (Plt;0.05) among treatments. CK,control; A1, KH2PO4 250 g/plant;A2, KH2PO4500 g/plant; A3, KH2PO4750 g/plant; A4, KH2PO41000 g/plant;B1,125g/plant of phosphate fertilizer + 125g/plant of potassium fertilizer;B2,250 g/plant ofphosphate fertilizer + 250 g/plant ofpotassium fertilizer;B3,375g/plant ofphosphate fertilizer + 375g/plant of potassium fertilizer;B4,500g/plant of phosphate fertilizer + 500 g/plant of potassium fertilizer.

4結(jié)論

果實(shí)膨大期不同磷鉀肥處理對(duì)油茶果實(shí)的經(jīng)濟(jì)性狀產(chǎn)生了不同程度的影響,在處理選擇上,需要根據(jù)具體目標(biāo)進(jìn)行權(quán)衡。如果以提高保果率為目標(biāo),處理B4最合適;以提高果實(shí)品質(zhì)為目標(biāo),處理A4可能是一個(gè)更好的選擇。從對(duì)花芽飽滿度的影響上來(lái)看,處理A2的效果最優(yōu),其花芽長(zhǎng)度、寬度、厚度、質(zhì)量、體積均顯著優(yōu)于對(duì)照,可為下一年的高產(chǎn)穩(wěn)產(chǎn)打下基礎(chǔ)。綜合來(lái)看,以處理B4的效果最佳。

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(責(zé)任編輯 李偉強(qiáng))

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