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    農業論文

    鉀肥對甘薯生長發育及產量和質量的影響

    時間:2019年06月10日 所屬分類:農業論文 點擊次數:

    【摘要】甘薯作為我國重要的糧食作物之一,甘薯是喜鉀作物,研究表明甘薯對鉀的吸收量最大,氮和磷次之,因此甘薯增產的重要措施之首為增施鉀肥,從而增加干物質積累,莖葉長度等。為了表明鉀肥不同的施肥量,施肥方式,施肥時期,對甘薯的生長發育情況,品

      【摘要】甘薯作為我國重要的糧食作物之一,甘薯是喜鉀作物,研究表明甘薯對鉀的吸收量最大,氮和磷次之,因此甘薯增產的重要措施之首為增施鉀肥,從而增加干物質積累,莖葉長度等。為了表明鉀肥不同的施肥量,施肥方式,施肥時期,對甘薯的生長發育情況,品質和產量的影響,本進行了綜述。

      【關鍵詞】鉀肥;甘薯;產量;施鉀方式

    遼寧農業科學

      甘薯相對于蕎麥和燕麥來說是重要的糧食作物,甘薯的優質和高產對于農業和相關工業的經濟效益發展意義重大。甘薯是大多喜鉀作物之一,增施鉀肥可增產。從全生育期來看,甘薯對鉀肥需求最多,氮肥次之,磷肥最少[1]。合理施用鉀肥是甘薯高產優質的重要前提,鉀肥的施用量、施用時期及鉀肥種類均對甘薯的品質和產量造成一定影響。

      1鉀肥施用量的劑量對甘薯的影響

      研究表明,在一定范圍內,施鉀可以顯著增加單株分枝數、平均蔓長和單株蔓重。隨著施鉀水平的提高,單株分枝數、平均蔓長和單株蔓重呈先增加后降低的趨勢。施鉀能極顯著提高單株薯重[1]。干物質積累量與動態改變,可簡明的反映植物的生長狀況和農藝性狀,光合作用的強弱及產量密切相關。在甘薯生育期中,施鉀可增加塊根的干物質積累量,它與移栽后天數成正比。

      甘薯的產量主要由甘薯的單株結薯數與結薯重決定,而鉀肥施用量對甘薯單株結薯數與結薯重有很大影響。施用鉀肥可提高單株結薯數,單株結薯重隨施用量增加,大中薯數量也增高,小薯數量下降。鉀肥量達到飽和以后,隨著施用量的增加,大中薯率反而有所下降[2]。可見想要提高甘薯產量,需要施用適當重量的鉀肥。鉀肥對甘薯的優質有很大影響,施有效鉀300kg/hm2時,塊根中具有豐富的蛋白質、淀粉、干物質和可溶性糖,適量的鉀肥促進光合產物向地下塊根運輸,合成足夠的營養,過高不及,施用有效鉀450kg/hm2時,各成分的含量均有所下降[3]。

      2鉀肥施用時期處理對甘薯的影響

      施鉀可大幅度增產,施鉀時期不同,增產效果不同但均可提高塊根產量,其中基施最為有效,為26.09%,封壟期次之。針對于甘薯的生物量、鉀素含量和鉀氮比,基施比分期施更好,不過分期施鉀提高后期的生物量、鉀素含量和鉀氮比[4]。因此分期施鉀是一種合適的施肥方式。甘薯的優質與鉀肥分期施用有關。通過分期施用可提高鉀肥利用率和偏生產力,使鉀肥的回報率得到提高。

      研究表明,封壟期改變甘薯優良性狀最好。基施導致生長前期功能葉碳水化合物含量降低,也可提高生長中后期功能葉中蔗糖和蔗糖與淀粉比值。研究發現,分期施鉀提高了塊根中淀粉積累速率和產量。同時施鉀提高了甘薯中各類酶的合成,加速塊根中碳的同化,光合產物的積累,使根系生長發育得到了良好的發展。

      3不同類型鉀肥對甘薯的影響

      根據實驗結果顯示,在單薯重的增加效果方面氯化鉀比硫酸鉀更有效。氯化鉀在葉片數、藤蔓長、分枝數、大中薯比例各項數據上,效果優于硫酸鉀,然而在蛋白質、粗纖維和總糖含量方面為氯化鉀次于硫酸鉀。不同人研究結果不一致,在周紅梅硫酸鉀和氯化鉀不同用量對甘薯生長和產量的影響這一實驗結果表明,兩種鉀肥均能提高單株塊根鮮重,對甘薯干物率無明顯影響。在一定范圍內對產量也無較大影響。

      4小結

      施鉀肥方式,時期以及鉀肥種類對甘薯的產質有極大的影響。甘薯作為抗逆性較強的作物,常種植于一些貧瘠的土壤中。其養分,穩產,高品質間的相互關系也應該進一步研究討論。根據實際栽培情況,綜合土壤、肥料、作物品種、種質資源和栽培制度等因素在提高甘薯營養品質方面還有很多方面可以研究。特別是肥料施用和新肥料品種等方面在甘薯品質優化中起顯著作用,在理論豐富的前提下以實踐為基礎進一步研究。

      參考文獻

      [1]陳根輝,郭其茂,林子龍等.不同施鉀量對龍薯28號產量和農藝性狀的影響[J].作物雜志,2017(3):91-95.

      [2]李啟輝.鉀肥施用量對甘薯農藝性狀和產量的影響[J].遼寧農業科學,2016(01):70-72.

      [3]尹子娟,郭華春,李存芝.施鉀對甘薯生長產量及品質的影響[J].云南農業科技,2011(4):21-23.

      [4]唐恒朋,李莉婕,楊守祥等.不同類型鉀肥對甘薯生長發育及產質量的影響[J].西南農學報,2016(29):5.

      農業刊物推薦:遼寧農業科學(雙月刊)創刊于1960年,是遼寧省農業科學院與遼寧省農學會共同主辦的綜合性農業科技期刊。主要報道農業科研進展和成果,宣傳農業新品種、新技術、新方法,傳播新的學術思想、觀點和科技知識。

      

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