a国产,中文字幕久久波多野结衣AV,欧美粗大猛烈老熟妇,女人av天堂

不同種植密度與施氮水平下高產(chǎn)玉米品種的干物質(zhì)與氮素累積分配及氮密互作研究

發(fā)布時(shí)間:2021-03-20 13:41
  玉米產(chǎn)量在過(guò)去十幾年已顯著提高,而氮的利用效率(NUE)則由于氮肥過(guò)量施用而遠(yuǎn)遠(yuǎn)落后于這一增長(zhǎng)。由于現(xiàn)代雜交種對(duì)氮肥的反應(yīng)更強(qiáng),因此,以高氮肥投入來(lái)提高產(chǎn)量,卻導(dǎo)致氮素淋溶問(wèn)題和氮素回收率低。每個(gè)玉米品種都有其遺傳和農(nóng)藝特性,應(yīng)通過(guò)優(yōu)化農(nóng)藝管理措施加以發(fā)揮品種特性,挖掘作物生產(chǎn)潛力。在此背景下,本研究進(jìn)行了兩年田間試驗(yàn)(2017年和2018年),通過(guò)RCBD田間設(shè)計(jì),定量化我國(guó)主要的高產(chǎn)玉米品種(ZD958,XY335)在不同的氮素投入(0N,120N,240N,450N)和種植密度下(67,500和90,000株ha-1)的氮素吸收和再分配,并研究其氮密互作效應(yīng)。這項(xiàng)研究的具體目標(biāo)是:a)研究氮素吸收和轉(zhuǎn)運(yùn)的變化規(guī)律,b)評(píng)估氮素施用量和種植密度對(duì)干物質(zhì)積累,作物產(chǎn)量和產(chǎn)量構(gòu)成因子的影響,c)研究高氮和高密度相互作用對(duì)作物冠層內(nèi)光分布、光合性能和氣體交換參數(shù)的影響;d)定量高密群體不同土壤深度下的Nmin淋溶程度,以定量化群體氮素吸收量;e)定量不同種植密度下的氮需求和再分配。主要研究結(jié)果如下:1)高密度顯著提高群體產(chǎn)量,而過(guò)量施氮并沒(méi)有帶來(lái)產(chǎn)量顯著提高。XY335在高密度(90,0... 

【文章來(lái)源】:中國(guó)農(nóng)業(yè)科學(xué)院北京市

【文章頁(yè)數(shù)】:162 頁(yè)

【學(xué)位級(jí)別】:博士

【文章目錄】:
摘要
ABSTRACT
LIST OF ACRONYMS
CHAPTER 1.INTRODUCTION
    1.1 BACKGROUND OF THE STUDY
    1.2 FACTORS RESPONSIBLE FOR HIGH YIELD IN MAIZE
    1.3 BREEDING EFFORTS IN MAIZE YIELD IMPROVEMENT
    1.4 AGRONOMIC EFFORTS IN MAIZE YIELD IMPROVEMENT
    1.5 HURDLES AND LIMITATION IN ACHIEVING YIELD POTENTIAL
    1.6 MANAGEMENT PRACTICES TO IMPROVE MAIZE GRAIN YIELD
        1.6.1 Nitrogen use efficiency and N uptake improvement through breeding
        1.6.2 Agronomic practices for N management in high density maize
    1.7 PROBLEM STATEMENT
    1.8 AIMS AND OBJECTIVES
CHAPTER 2.MATERIALS AND METHODS
    2.1 FIELD CHARACTERISTICS AND SITE DESCRIPTION
    2.2 EXPERIMENTAL DESIGN AND TREATMENT SETUP
    2.3 PLANT MATERIAL
    2.4 AGRONOMIC MANAGEMENT AND PLANT SAMPLING
    2.5 MEASUREMENTS AND CALCULATIONS
        2.5.1 Plant sampling for leaf area,DMA and nutrient concentration
        2.5.2 Crop growth parameters
        2.5.3 Canopy light interception,Photosynthesis and SPAD measurements
        2.5.4 Grain filling duration and grain filling rate
        2.5.5 Yield and yield components
        2.5.6 Soil Nmin determination
        2.5.7 Plant N analysis,N use efficiency(NUE)and NUE components
        2.5.8 Statistical Methods and Analysis
CHAPTER 3.YIELD,DRY MATTER ACCUMULATION AND CANOPY TRAITS
    3.1 INTRODUCTION
        3.1.1 An overview of maize agronomy under different managements
    3.2 RESULTS
        3.2.1 Grain yield and yield attributes
        3.2.2 Leaf area index and green leaf number
        3.2.3 Dry matter accumulation and dry matter partitioning
        3.2.4 Plant height,ear height and stem diameter
        3.2.5 Grain filling rate
    3.3 DISCUSSION
        3.3.1 Maize hybrids differ greatly for yield traits under nitrogen and density stress
        3.3.2 Characteristics of yield improvement under high density and high nitrogen
        3.3.3 Post-silking dry matter accumulation contributed more in hundred seed weight as a function of source-sink balance
        3.3.4 Conclusion
CHAPTER 4.PHOTOSYNTHESIS AND LIGHT DISTRIBUTION
    4.1 INTRODUCTION
    4.2 RESULTS
        4.2.1 SPAD measurements
        4.2.2 Gaseous exchange measurements
        4.2.3 Light distribution within crop canopy
    4.3 DISCUSSION
        4.3.1 High N rate maintains SPAD and photosynthetic activity of maize hybrids
        4.3.2 High density and high N interplay for light distribution within crop canopy
        4.3.3 Conclusion
CHAPTER 5.PLANT NITROGEN UPTAKE AND UTILIZATION EFFICIENCY
    5.1 INTRODUCTION
    5.2 RESULTS
        5.2.1 Nitrogen use efficiency(NUE)and components of NUE
        5.2.2 N translocation and translocation efficiency
    5.3 DISCUSSION
        5.3.1 Characteristics of maize hybrids regarding N uptake and utilization efficiency
        5.3.2 High N rate and high planting density maximized the NUE
        5.3.3 Conclusion
CHAPTER 6.SOIL MINERAL NITROGEN DYNAMICS
    6.1 INTRODUCTION
    6.2 RESULTS
4-N)status in soil">        6.2.1 Ammonium-N(NH4-N)status in soil
3-N)status in soil">        6.2.2 Nitrate-N(NO3-N)status in soil
    6.3 DISCUSSION
        6.3.1 Effects of N rates and plant density on soil ammonium N
        6.3.2 Effects of N rates and plant density on soil nitrate N
        6.3.3 Conclusion
CHAPTER 7.SUMMARY AND RECOMMENDATIONS
References
Appendix 1:Yield,dry matter accumulation and canopy traits
Appendix 2:Photosynthesis and light distribution
Appendix 3:Plant nitrogen uptake and utilization efficiency
Appendix 4:Soil mineral nitrogen dynamics
Appendix 5.Layout for field experiment
Acknowledgements
Curriculum Vitae


【參考文獻(xiàn)】:
期刊論文
[1]Influence of plant architecture on maize physiology and yield in the Heilonggang River valley[J]. Shoubing Huang,Yingbo Gao,Yebei Li,Lina Xu,Hongbin Tao,Pu Wang.  The Crop Journal. 2017(01)
[2]實(shí)施密植高產(chǎn)機(jī)械化生產(chǎn) 實(shí)現(xiàn)玉米高產(chǎn)高效協(xié)同[J]. 李少昆,王克如,謝瑞芝,侯鵬,明博,楊小霞,韓冬生,王玉華.  作物雜志. 2016(04)
[3]密度對(duì)耐密性不同玉米品種群體冠層結(jié)構(gòu)的影響[J]. 唐建華,張衛(wèi)建,王延波,于吉琳,宋振偉,劉榮,王大為,劉穎,齊華.  作物雜志. 2013(02)
[4]提高密度對(duì)根冠發(fā)育及其產(chǎn)量的影響研究[J]. 張鳳路,牛興奎,張怡明,李少昆,謝瑞芝,劉鑫,修文雯.  華北農(nóng)學(xué)報(bào). 2012(02)
[5]緩/控釋肥在玉米生產(chǎn)中的應(yīng)用與展望[J]. 王宜倫,李潮海,王瑾,譚金芳.  中國(guó)農(nóng)學(xué)通報(bào). 2009(24)
[6]華北地區(qū)冬小麥-夏玉米輪作體系的氮素循環(huán)與平衡[J]. 趙榮芳,陳新平,張福鎖.  土壤學(xué)報(bào). 2009(04)
[7]作物高產(chǎn)群體干物質(zhì)積累動(dòng)態(tài)模型的構(gòu)建及生長(zhǎng)特性分析[J]. 侯玉虹,陳傳永,郭志強(qiáng),侯立白,董志強(qiáng),趙明.  玉米科學(xué). 2008(06)
[8]中國(guó)土壤和植物養(yǎng)分管理現(xiàn)狀與改進(jìn)策略[J]. 張福鎖,崔振嶺,王激清,李春儉,陳新平.  植物學(xué)通報(bào). 2007(06)
[9]我國(guó)玉米品種更替過(guò)程中根系時(shí)空分布特性的演變[J]. 王空軍,鄭洪建,劉開(kāi)昌,張吉旺,董樹(shù)亭,胡昌浩.  植物生態(tài)學(xué)報(bào). 2001(04)



本文編號(hào):3091096

資料下載
論文發(fā)表

本文鏈接:http://www.wukwdryxk.cn/shoufeilunwen/nykjbs/3091096.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶2525b***提供,本站僅收錄摘要或目錄,作者需要?jiǎng)h除請(qǐng)E-mail郵箱bigeng88@qq.com
天堂一区二区| 欧美牲交A欧美牲交aⅴ久久| 黑人后入| а√天堂中文在线资源bt在线 | 亚洲精品国产精品国自产| 粗大的内捧猛烈进出视频嘿嘿视频| 国产精品96| 大香蕉操| 久久亚洲AV无码精品色午夜麻| 日韩人妻无码精品一专区| 富阳市| 欧美综合久久| 欧美激情视频一区二区三区| 成人午夜高潮A∨猛片| 欧美精品v国产精品v日韩精品| 色悠久久久久综合欧美99| 狠狠躁夜夜躁人人爽天天开心婷婷| 国产大屁股喷水| 日本久久精品| 依依成人精品视频在线观看| japanese老熟妇乱子伦视频| 人人妻人人爽人人澡人人| 国产精品区av| 成人av影视| 美国三级黄色片| 久久久久9999| 亚洲囯产精品久久久久久无码| 成人中文乱幕日产无线码| 亚洲精品成人AV在线| 国产精品国产亚洲区艳妇糸列短篇| 灵寿县| 91久久香蕉国产熟女线看| 天堂1| 野花3| 午夜aa| 福利视频网址导航| 久久精品网站免费观看| 精品无码AV一区二区三区不卡 | xx日本| 久久精品夜色噜噜亚洲A∨| 野花社区在线视频最新|