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利用15N自然丰度法区分有机和常规生产的作物
15N 有机作物 氮肥 分馏
2011/12/20
应用15N自然丰度法区分有机和常规生产作物,是近年来国内外氮同位素技术应用研究的热点之一。由于化学合成氮肥和有机肥δ15N的不同,作物产品中相应的δ15N也不同,因此利用作物δ15N判断肥料类型就成为可能。影响作物δ15N的因素,除氮肥类型外,还包括作物的类型、生长阶段、部位、大气沉降、水分、pH以及土地利用方式等。在利用作物15N自然丰度判断氮肥类型过程中,必须特别注意这些因素的综合影响。目前的...
通过田间试验，采用15N示踪法，设置全生育期不灌水（W0）、冬水+拔节水（W1）、冬水+拔节水+开花水（W2） 3个灌水处理，每次灌水60 mm，每个灌水处理下，设置15N尿素作底肥+普通尿素作追肥、普通尿素作底肥+15N尿素作追肥2个15N示踪处理的微区，研究不同灌水处理对小麦氮素吸收分配及利用效率的影响。结果表明，成熟期地上部植株氮素积累量及来源于土壤的氮素的积累量均为：W2＞W1＞W0；肥料...
利用15N自然丰度法区分有机和常规生产的作物
15N 有机作物 氮肥 分馏
2011/5/24
应用15N自然丰度法区分有机和常规生产作物,是近年来国内外氮同位素技术应用研究的热点之一。由于化学合成氮肥和有机肥δ15N的不同,作物产品中相应的δ15N也不同,因此利用作物δ15N判断肥料类型就成为可能。影响作物δ15N的因素,除氮肥类型外,还包括作物的类型、生长阶段、部位、大气沉降、水分、pH以及土地利用方式等。在利用作物15N自然丰度判断氮肥类型过程中,必须特别注意这些因素的综合影响。目前的...
以东农47为试材，采用15N 标记的(NH4)2SO4为氮源，利用砂培方式研究了氮素营养水平对大豆籽粒氮素构成和产量的影响。结果表明：随外源氮水平增加，大豆产量呈先增加后降低的变化趋势，营养液中氮为50 mg·L-1产量最高；前期高氮后期低氮处理时，随高氮处理的时间延长产量降低；于R4或R5期提高外源氮水平可以增加大豆产量。对大豆产量与籽粒中肥料氮所占比例、大豆产量与根瘤固氮所占比例分别作回归分析...
由于缺少相应的检测技术，市场上常有用无公害农产品充当有机农产品销售的情况发生。有机茶在我国是最大的有机认证产品，同样面临这一问题，导致有机茶无法实现现质优价。根据δ15N在土壤、肥料及植物领域的最新研究结果及平衡原理，结合有机茶生产肥料使用要求，本文提出了一种鉴别有机茶是否施用过化肥的最新方法——δ15N分析法，并对其原理及可行性作了详细的分析说明。
主枝开张角度对盆栽红富士苹果 13C和 15N分配、利用的影响
红富士苹果 13C 15N分配 利用
2010/11/15
以3年生盆栽红富士苹果 (Malus domestica Borkh.cv. Red Fuji)/平邑甜茶 (Malus hupehensis)为试材，研究了主枝开张角度对盆栽红富士苹果对13C分配及15N-尿素分配、利用的影响。结果表明，根系13C分配率随主枝开张角度的增大而减少，在秋梢生长期对照、枝条水平和枝条下垂3处理根系的13C分配率分别为46.39%、36.39%和26.73%；而叶片1...
以15年生“惠民短枝”（短枝型）和“长富10”（普通型）红富士苹果/平邑甜茶(M. domestica Borkh. cv. Red Fuji/M. hupenensis Rhed)为试材，研究其对春季土施15N-尿素的吸收、分配与利用特性。结果表明，盛花期短枝型和普通型红富士均以细根中吸收的氮素来源与肥料的比例(Ndff)值最高，分别为0.407%和0.286%，短枝型显著高于普通型; 新梢旺长...
Partitioning of 15N Applied at Reproductive Stages among Grains and in Grain Tissues of Rice Plants
Competition Grain Nitrogen Partitioning Position on panicle Rice Ripening
2009/8/4
Hydroponically-grown rice (Oryza sativa L.) plants were pulse-labelled with 15N-ammonium sulphate at various stages of reproductive growth, and partitioning of 15N among grains or grain tissues were e...
Plant Growth, Uptake and Partitioning of Nitrogen in Alfalfa Seedlings as Affected by the Form of 15N-Labelled Combined Nitrogen
Alfalfa Ammonium-N Nitrate-N Nitrogen fertilizer Nitrogen uptake and partitioning Recovery of 15N Root growth
2009/7/30
We investigated the growth, uptake and partitioning of nitrogen (N) in alfalfa seedlings grown in the pot soil where 15N-labelled combined N was applied as nitrate-N or ammonium-N by means of basal dr...
Nitrogen Uptake by Faba Bean from 15N-Labelled Oilseed-Rape Residue and Chicken Manure with Ryegrass as a Reference Crop
Chicken manure Faba bean N uptake Nutrition Oilseed-rape residue Ryegrass
2009/7/29
The effects of soil amendment with oilseed-rape residue (OSRR) and chicken manure (CM) on the growth and nitrogen (N) uptake of faba bean (Vicia faba L.) were assessed in a pot experiments with Italia...
Alteration in Intra-plant Distribution of δ15N in Response to Shading in Legumes
Common bean Cowpea δ15N Natural 15N abundance method Nitrogen fixation %Ndfa Soybean
2009/7/24
The intra-plant distribution of 15N in common bean, cowpea and soybean having different levels of responses to shading and N2-fixing ability were analyzed under shaded and non-shaded conditions. Maize...
Difference in δ15N Signatures among Plant Parts of Perennial Species Subjected to Drought Stress with Special Reference to the Contribution of Symbiotic N2-fixation to Plant N
Actinorhizal plant δ15N 15N natural abundance method Nitrogen fixation Perennial plant
2009/7/24
The 15N natural abundance method has been widely used for evaluation of symbiotic N2-fixation. The method inevitably requires a reference plant that reflects soil derived δ15N similar to that in a N2-...
Rice Uptake and Recovery of Nitrogen with Different Methods of Applying 15N-Labeled Chicken Manure and Ammonium Sulfate
Ammonium sulfate Chicken manure Method of fertilizer application 15N-labeled Nitrogen recovery Rice
2009/7/23
The effects of different methods of fertilization on rice uptake and recovery of nitrogen were studied using 15N-lablled chicken manure (CM) and ammonium sulfate (AS). The results showed that the appl...
Influence of Split Ammonium Sulfate on Nitrogen Availability from 15N-Labeled Matured Soybean as Green Manure for Buckwheat (Fagopyrum esculentum Moench)
Buckwheat Matured soybean Split ammonium sulfate
2009/7/22
A pot experiment was conducted at the Experimental Farm of Gifu University to study the effects of 15N-labeled matured soybean as green manure, with and without splitted ammonium sulfate, on the growt...