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  3. Agricultural Chemistry Division / 農業化學組
  4. 柑桔營養診斷之基礎及應用之現況
 
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柑桔營養診斷之基礎及應用之現況

Other Title
Bases of leaf diagnosis for citrus and the nutritional status in Taiwan
Series/Report No.
農業試驗所特刊; 28
Part Of
(特028號)果園作物營養診斷應用研習會專輯  
Start Page
1
End Page
26
Date Issued
1989-05
Date
1989-05
Author(s)
連深
張淑賢
黃維廷 
吳婉麗
S. Lian
S.S. Chang
W.T. Huang 
W.L. Wu
URI
https://scholars.tari.gov.tw/handle/123456789/7216
Abstract
果園土壤因採樣不易,變異又大,不易反應果樹營養狀況。反之,葉片取樣容易、變異較小,乃為診斷之較佳對象。葉片分析輔以變異性較小之土壤測定,如pH、質地、有機質含量等,應為果樹營養診斷之主要依鋸。 葉片之氮、磷、鉀濃度大約均隨葉齡之增加(果實之肥大成熟)而降,而鈣之濃度則隨葉齡之增加而增,但大体上以8~9月間(葉齡5~6個月)比較穩定,故葉片之採樣時期亦以該期間為標準。又結果枝葉片之要素濃度一般均低於不結果枝,而且其隨葉齡之變化亦是較大,故採樣部位以非結果枝較宜,係以當年生春梢無結果枝第3或4葉為標準。 經過長期的肥料試驗和田間調查,確定下列關係及葉片要素濃度之適宜範圍。(1)在葉片氮素濃度2.8~3.5%範圍內,果實產量和品質(糖度、貯藏性、皮厚等)與氮素濃度均呈顯著負相關;故由此等關係訂定碰柑、柳橙之葉片適宜氮素濃度範範圍各為3.0~3.2及2.9~3.1%。(2)在葉片鉀素濃度0.8~2.0%範圍內,無論碰柑、柳橙果實大小均與葉片鉀素濃度均呈顯著正相關,但葉片中鉀素濃度與鎂素濃度卻有顯著負相關;故為避免因鉀素濃度過高而缺鎂,同時亦顧及果實品質,乃訂定其適宜濃度範圍為1.4~1.7%。(3)在葉片鎂素濃度0.20~0,40%範圍內,果實糖度與鎂素濃度呈有顯著之正相關;鎂素濃度低於0.25%則呈缺鎂徵狀,乃訂其適宜範圍為0.27~0.50%。(4)其他呈現缺錳、硼、鋅等徵狀之葉片濃度(均小於20PPm),及呈現銅或硼過高等毒害徵狀之葉片濃度(各達50及150ppm)亦經田間一一確認。各種要素濃度之適宜範圍綜合如下: The bases of establishing optimum nutrient criteria of citrus leaves for the diagnostic purpose in Taiwan have been reviewed, and the criteria established. According to this criteria, the nutritional problems of citrus in Taiwan are high in nitrogen and low in potassium, magnesium, zinc and boron. Occasinally the content of copper is high, which might be related to the frequent foliar application of bordeaux mixture.
Event(s)
果園作物營養診斷應用研習會
Proceeding of a Workshop Application Of Nutritional Diagnosis In The Orchards Of Taiwan
Publisher
臺灣省農業試驗所
Type
book part
File(s)
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Name

publication_no28-1.pdf

Size

1.75 MB

Format

Adobe PDF

Checksum

(MD5):961636006ad30ae1b5ea4037a0ef5d24

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