【文章內(nèi)容簡介】 普通本科生畢業(yè)論文(設(shè)計)水稻陸兩優(yōu)996的臨界氮稀釋曲線測定與分析Determination and analysis of rice luliangyou 996critical nitrogen dilution curve學(xué)生姓名：衣啟樂學(xué) 號：201042144125年級專業(yè)及班級：2010級生態(tài)學(xué)（1）班指導(dǎo)老師及職稱：劉向華 副教授 學(xué) 院：生物科學(xué)技術(shù)學(xué)院湖南長沙 提交日期：2014年 5 月目 錄摘 要：.....................................................................................................................關(guān)鍵詞：...................................................................................................................1 前言.........................................................................................................................................................................................................................................................................................................................................................................................................................................2 材料與方法......................................................................................................... 試驗材料............................................................................................................ 試驗設(shè)計............................................................................................................ 測定項目.......................................................................................................... 干物質(zhì)測定................................................................................................... 氮的測定......................................................................................................... 成熟期產(chǎn)量測定...........................................................................................3結(jié)果與分析............................................................................................................ 數(shù)據(jù)處理.......................................................................................................... 實驗水稻移栽后地上部干重變化情況............................................................ 不同施氮處理下水稻產(chǎn)量分析...................................................................... 臨界氮的計算..................................................................................................4 討論與結(jié)論...................................................................................................................................................................................................................................................................................................................................................................................................參考文獻(xiàn).................................................................................................................致謝.....................................................................................................................2that the ecological conditions on rice nitrogen concentration dilution curve of the critical feed rate was less affected, the model has good parameters of “a” were different in different ecological regions showed that the critical nitrogen specific dilution curve wss a little bit different for this : rice。biomass。nitrogen accumulation。critical nitrogen concentration。model 前言氮元素是作物生長所必需的營養(yǎng)元素之一，當(dāng)前世界水稻種植國在水稻施肥方面仍以氮肥為主[1]。水稻產(chǎn)量的大幅度提高也是以氮素的高投入為基礎(chǔ)。過量施氮不僅增產(chǎn)效果甚微，而且給環(huán)境造成負(fù)效應(yīng)[14]