氮肥施用與烤煙氮素營養(yǎng)關(guān)系研究
Relationship of Nitrogen Rates and Nitrogen Nutrition of Flue-cured Tobacco
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摘要: 通過調(diào)查,、營養(yǎng)診斷與化學(xué)分析等方法，研究了烤煙葉片硝酸鹽濃度速測(cè)結(jié)果與煙株氮素營養(yǎng)狀況之間的對(duì)應(yīng)關(guān)系,。結(jié)果表明,，施氮量對(duì)烤后煙葉產(chǎn)質(zhì)量和內(nèi)在化學(xué)成分中總氮和煙堿含量有較大影響；煙株大田生育期內(nèi)最新平展葉硝酸鹽濃度呈反“S”型變化,，該曲線可用二元四次方程曲線擬合,，相關(guān)關(guān)系極顯著；不同農(nóng)戶煙株硝酸鹽濃度下降的反“S”型曲線在橫坐標(biāo)水平上出現(xiàn)較明顯變異,，縱坐標(biāo)方向變異較小,。最新平展葉硝酸鹽濃度與施氮量和煙葉氮素含量有較好的對(duì)應(yīng)關(guān)系，能夠反映大田煙株氮素營養(yǎng)狀況,，可用于大田煙株氮素營養(yǎng)速測(cè),。Abstract: Field investigation, nutrition diagnosis and chemical analysis were employed to study the relationship between nitrogen rates and nitrate contents in flue-cured tobacco leaves. The results showed that nitrogen rate had remarkable influence on yields and quality, and the contents of total nitrogen and nicotine of cured tobacco leaves. A reverse S model curve of nitrate content in the latest fully expanded leaves was observed, which could be simulated by duality and quartic equation with highly significant relation. The reverse “S” of nitrate contents in tobacco leaves from different fields changed evidently in abscissa, yet little in ordinate. The nitrate content in the latest fully expanded leaves increased with the increasing nitrogen rate, and could reflect the nitrogen nutrition status of flue-cured tobacco plants, so it could be applied in the rapid test of nitrogen nutrition.
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