搜索结果: 151-165 共查到“知识库 土壤化学”相关记录820条 . 查询时间(1.421 秒)
一种林地土壤氮磷钾含量快速测定的新方法
可见/近红外光谱 杉木 土壤肥力 偏最小二乘
2011/4/2
为实现林地土壤肥力的快速监测,笔者提出一种基于可见/近红外光谱技术,同时进行杉木林土
壤全氮、全磷与全钾测定的新方法。以FieldSpec®3 地物光谱仪采集杉木林土壤48 份,随机分成校正
集(32 份)和检验集(16 份)。光谱采用S.Golay 实现平滑去噪与标准归一化进行背景去除后,选取350~
2350 nm的反射光谱,以偏最小二乘算法(PLS)建立回归模型。结果表明,3 ...
Organic and inorganic carbon stocks and balance of Adana city soils in Turkey
Adana soils soil organic carbon amounts and stocks
2011/1/12
Carbon stocks are calculated between from 0 - 100 cm depths of Adana great soil groups (GSG). Total carbon stock is 567.19 Tg in 0 - 100 cm, 168.37 Tg of which is organic carbon (OC) and 398.83 Tg of ...
采用QuEChERS方法结合气相色谱-质谱(GC-MS)法建立了土壤中苯醚甲环唑残留的快速分析方法。用乙腈提取土壤中的苯醚甲环唑,基质固相分散净化后,GC-MS外标法定量。结果表明:方法具有快速、简便、高效、灵敏等优点,苯醚甲环唑在0.005~0.5 μ g/mL质量浓度范围内呈线性关系,相关系数达0.999。土壤中苯醚甲环唑添加水平为0.01~0.5 mg/kg时,平均回收率为74.2%~91....
为提高臭氧破解污泥的效率,降低剩余污泥原位减量成本,采用自制的污泥臭氧氧化反应装置,重点研究了臭氧投量、pH值和初始污泥浓度对污泥破解效能的影响。结果表明:40mg/g是破解污泥的临界臭氧投量,高于此值,污泥固体颗粒开始溶解,并随着臭氧投量的增加而增加;中性、偏酸性环境和较高的污泥初始浓度有利于污泥的臭氧氧化破解。综合考虑污泥破解后胞内物质释放情况,确定最佳操作条件:臭氧投量为208 mg/g,p...
云南台地茶园土壤化学成分研究
云南省 台地茶园 土壤 化学成分
2011/4/2
为提高云南省台地茶园土壤肥力提供理论依据。采用火焰光度法和原子吸收法等方法测定云南
省茶叶主产区西双版纳、普洱、临沧和保山等地区台地茶园土壤大量营养元素、微量营养元素和重金属
元素等化学成分的含量。结果表明,云南省台地茶园土壤有机质平均含量为3.88%,碱解氮、速效磷、速
效钾、有效钙、有效镁、有效铁、有效锰、有效铜、有效锌、有效硼、全铬和全铅平均含量分别为133.55、
6.78、83....
代森锰锌在黄瓜和土壤中的残留动态
代森锰锌 黄瓜 土壤 残留
2011/4/2
采用田间试验方法,研究了代森锰锌在黄瓜及土壤中的消解动态和最终残留,气相色谱法定量分
析。此方法黄瓜中代森锰锌的平均回收率为89.02%~95.50%;土壤中代森锰锌的平均回收率为86.59%
~93.03%。结果表明,代森锰锌在黄瓜和土壤中消解较快,其半衰期分别为1.57~3.51 天和3.85~11.44
天。在黄瓜上使用精甲霜灵·代森锰锌水分散粒剂,按照推荐使用剂量最多施药3 次,最后...
The effects of soil boron and calcium applications on boron and calcium uptake in Durum wheat (Triticum durum L.)
Boron boron toxicity calcium Durum wheat
2011/1/12
Recently, boron (B+) toxicity has received a great deal of attention as it decreases yield of crops significantly. In this study, we investigated whether the application of different levels calcium (C...
Effect of soil nitrogen levels on some micronutrients, antinutrients and toxic substances in Corchorus olitorius grown in Minna, Nigeria
Corchorus olitorius nitrogen level antinutrients toxic substances
2011/1/13
The nature of soil type is an important factor in the bioaccumulation of substances in plants. Application of nitrogen fertilizer is a common practice in vegetable farming. This study was therefore co...
在20℃恒温培养条件下,研究低分子量有机酸类的钠钙盐(LA)和低分子量有机酸类与混合氨基酸的钠钙盐(LAA)不同用量水平对红壤和黑土磷有效性的影响。研究表明,两种低分子量有机酸类混合物在各不同水平下均能显著提高红壤和黑土磷有效性; 随着培养的进行,添加有LA、LAA的各处理对红壤和黑土中磷有效性均有明显提高。无论是LA或LAA,红壤中以半量处理对提高磷有效性作用效果更为明显,而黑土中则以LAA作用...
通过田间试验和化学分析,研究了不同施氮水平对翠碧1 号烤烟生育期、烤后烟叶产质量和烟叶风格的影响。结果表明,不同施氮量对烤烟生育期、经济性状、外观质量、化学成分和感官评吸质量均有显著的影响。施氮量增加,烟株大田生育期明显延长;烤后烟叶产量、不同部位单叶重、总氮和烟碱含量明显增加,总糖和还原糖含量、还原糖/烟碱和总氮/烟碱比值表现下降的趋势;烟叶“清香型”风格彰显趋向弱化。施氮量大于78 kg/hm...
Uptake of Lead by Celosia Argentea in an Ultisol
Excluder Lead phyto-availability uptake Ultisol
2010/11/15
The experiment was carried out in the greenhouse at Faculty of Agriculture, University of
Benin, Benin City to investigate lead uptake by Celosia argentea in an experiment organized in a completely r...
Determination on quality characteristics of some important Japanese plum (Prunus salicina Lindl.) cultivars grown in Mersin-Turkey
Japanese plum fruit quality fruit weight
2011/1/11
This experiment was conducted in Mut-Mersin from 2008 to 2009 to determine the phenological and pomological characteristics of ‘Angeleno’, ‘Autumn Giant’, ‘Bella Di Barbiano’, ‘Black Amber’, ‘Black B...
Spatial analysis of some physical soil properties in a saline and alkaline grassland soil of Kayseri, Turkey
Salinity alkalinity geostatistics spatial variation kriging
2011/1/11
In this study, geostatistical analysis of electrical conductivity (EC) and soil pH values, soil clay (C), silt (Si), and sand (S) content, permanent wilting point (PWP), organic matter (OM), field cap...
低磷胁迫对不同基因型甜菜抗性生理特征的效应
甜菜 磷胁迫 抗逆生理
2012/3/30
选用对低磷胁迫抗性各异的3个甜菜品种: 品20、品17和品14,在人工培养室内采用沙培试验法,研究了甜菜抗耐低磷胁迫的生理机制。结果表明,低磷胁迫限制了甜菜对磷的吸收,导致植株含磷量和生物产量显著下降; 不同品种间差异显著,品14降幅最大,品17次之,品20最小。与足磷处理(P 100 μmol/L)相比,低磷胁迫后甜菜品种间体内抗性生理特征差异显著。其中,品14和品17的丙二醛含量、脯氨酸含量、...