1,080 research outputs found
Interactions of mustard plants and soil microorganisms after application of sugarcane filter cake and pea residues to an Andosol
No full textIn a pot experiment using a strongly P-fixing Andosol from Nicaragua, the effects of sugarcanefilter cake application on the growth of white mustard (Sinapis alba L.) were compared with those of 13C-labeled pea residues. The application of pea residues led to a 50% increase and the application of filter cake to a 30% decrease in soil organic matterderived microbial biomass C compared with the control. In contrast, the application of filter cake resulted in a four times higher content of substrate-derived microbial biomass C than that of pea residues. The application of organic substrates generally increased microbial biomass N. Mustard growth led to significant increases in microbial biomass P in the control, but also in the organic-amendment treatments, which always resulted in decreased microbial biomass C : P ratios. Mustard growth also led to increased contents of Bray-1-extractable P, but this increase was only significant in the filter cake treatment. The application of pea residues had no effect on the yield of shoot C, but a positive effect on the yield of root C in comparison with the nonamended control. In contrast, the application of filter cake significantly depressed yields of shoot C and root C, due to N immobilization, presumably due to the high concentration of lignin.Alexander von Humboldt Foundation; DAA
Priming effects of Aporrectodea caliginosa on young rhizodeposits and old soil organic matter following wheat straw addition
No full textPrevious work has shown that endogeic earthworms cause different, i.e. apparent as well as true positive priming effects, presumably due to unknown interactions of substrate-colonising fungi and labile SOM, e.g. rhizodeposits. To explore these interactions, a soil that had previously been enriched with C-13- and N-15-labelled rhizodeposits of pea (Pisum sativum L) plants was used in an incubation experiment. The objective was to determine whether Aporrectodea caliginosa causes a priming effect on the decomposition of young rhizodeposits and old soil organic matter (SOM) following wheat straw addition. After 56 days of incubation at 12 degrees C, earthworm effects on autochthonous SOM-derived CO2 (+88%) were higher than on rhizodeposit-derived CO2 (+16%), indicating a stronger true positive priming effect on old SOM than on young rhizodeposits. Feeding of A. caliginosa significantly reduced microbial biomass C (-12%) and N (-30%) derived from rhizodeposits. In contrast, SOM-derived microbial biomass C and N remained unaffected, indicating a higher palatability of rhizodeposits. However, they were not catabolized to CO2, but preferentially anabolized, i.e. transferred to the biomass of microorganisms and earthworms. Not only straw but also A. caliginosa generally caused a shift in the microbial community towards saprotrophic fungi, as indicated by increased ergosterol contents and ergosterol to microbial biomass C ratios. A. caliginosa decreased delta N-15, total N, and N derived from rhizodeposits in the non-decomposed straw recovered as particulate organic matter, indicating the importance of rhizodeposits as an N source. (C) 2015 Elsevier Masson SAS. All rights reserved.Research Training Group of the German Research Foundation (DFG) [1397
Coat Cooke & Joe Poole | Coat Cooke & Rainer Wiens: Reviews
No full textCoat Cooke album reviews by Randy Raine-Reusch. Coat Cooke (sax); Joe Poole (drums); Rainer Wiens (guitar)
Get on your boots: estimating root biomass and rhizodeposition of peas under field conditions reveals the necessity of field experiments
No full textI have the touch – evidence for considerable N transfer from peas to oats by rhizodeposition
No full textAbstract Aims The current study quantified the carbon (C) and nitrogen (N) transfer from peas to oats under field conditions to assess the effects of intercropping. The data obtained were compared with previously published pot and field experiments. Methods Pea ( Pisum sativum L. cv. Santana) and oat ( Avena sativa L. cv Dominik) plants were grown as intercrops for 105 days. Pea plants were labelled with a solution of 2% 13 C glucose (99 atom%) and 0.5% 15 N urea (95 atom%), using the cotton wick technique. Results Pea rhizodeposits reached 540 kg C ha −1 and 17 kg N ha −1 . CdfR (C derived from rhizodeposition) and NdfR corresponded to a proportion of 18.2 and 12.7%, respectively, of total pea biomass C and N. In the intercropped oat plants, only 0.6% of the total pea CdfR amount was found, but nearly 30% of the total pea NdfR amount. Conclusions CdfR and NdfR as proportion of total pea biomass C and N, respectively, were 2.5 times higher in peas intercropped with oat plants than in sole-cropped pea plants, comparing the current results with those from previously published pot and field experiments. Future studies on intercropping should consider root formation and rhizodeposition more often
Robert Rainer and Claud Garner
No full textAuthor Claud Garner, right, autographed copies of his second novel while discussing a tour of other Southwest cities with Robert Rainer, representing his publisher, Creative Age Press. Published in the Fort Worth Star - Telegram morning edition, September 29, 1950.https://mavmatrix.uta.edu/specialcollections_startelegram1950s/6596/thumbnail.jp
Quantum chemistry of 2D-nanomaterials : investigation of graphene, hBN and α-borophene on SiO2 (001)
No full textAuthor: Felix Rainer Serafin Purtscher, BScMasterarbeit University of Innsbruck 202
Quantum chemistry of 2D-nanomaterials : investigation of graphene, hBN and α-borophene on SiO2 (001)
No full textAuthor: Felix Rainer Serafin Purtscher, BScMasterarbeit University of Innsbruck 202
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