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Humic substances and its distribution in coffee crop under cover crops and weed control methods Scientia Agricola
Martins,Bruno Henrique; Araujo-Junior,Cezar Francisco; Miyazawa,Mario; Vieira,Karen Mayara.
ABSTRACT Humic substances (HS) comprise the passive element in soil organic matter (SOM), and represent one of the soil carbon pools which may be altered by different cover crops and weed control methods. This study aimed to assess HS distribution and characteristics in an experimental coffee crop area subjected to cover crops and cultural, mechanical, and chemical weed control. The study was carried out at Londrina, in the state of Paraná, southern Brazil (23°21’30” S; 51°10’17” W). In 2008, seven weed control/cover crops were established in a randomized block design between two coffee rows as the main-plot factor per plot and soil sampling depths (0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm) as a split-plot. HS were extracted through alkaline and acid...
Tipo: Info:eu-repo/semantics/article Palavras-chave: UV-Vis spectroscopy; Conservation agriculture; Soil organic matter; Carbon content; Chemical fractionating.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400371
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Optimization of Parameters for Biosynthesis of Silver Nanoparticles Using Leaf Extract of Aegle marmelos BABT
Christopher,JohnSamuel Godwin; Saswati,Banerjee; Ezilrani,PanneerSelvam.
ABSTRACTThe aim of this study was to optimize the biosynthesis of silver nanoparticles using leaves ofAegle marmelos as the primary source. The optimal reaction medium comprised 2:1 concentration of leaf extract and 6mM concentration of silver nitrate solution (pH 7. The biosynthesized silver nanoparticles were confirmed by UV-Vis spectroscopy at 420 nm, XRD and FTIR analysis. The antimicrobial properties of silver nanoparticles were confirmed withBacillus subtilis andPseudomonas aeruginosa.
Tipo: Info:eu-repo/semantics/article Palavras-chave: AgNO3; Aegle marmelos leaf; UV-Vis spectroscopy; XRD; FTIR.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500702
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