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991.
Otto Aurich Siegfried Danert Anneliese Romeike Hasso Rönsch Klaus Schréiber Günther Sembdner 《Genetic Resources and Crop Evolution》1967,15(1):205-242
Zusammenfassung In Fortführung früherer Untersuchungen wurden weitere 148 Pflanzenarten aus 20 Familien vor allem des Gaterslebener Sortiments nach einem Standardverfahren orientierend auf vorkommende Alkaloide und Saponine geprüft.
II. Mitteilung: Aurich und Mitarb. (1966). 相似文献
Summary In continuation of former investigations 148 further plant species belonging to 20 families mainly from the collection at Gatersleben have been studied preliminarily for occurring alkaloids and saponins using a standard procedure.
. 148 20 , . .
II. Mitteilung: Aurich und Mitarb. (1966). 相似文献
992.
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994.
We estimated the contribution of dissolved organic matter (DOM) to cation leaching and the translocation of acidity in three acid forest soils. The analysis was based on monitored (2 years) concentrations of dissolved organic carbon (DOC) in the field, measured total acidities of DOM, and measured as well as predicted weighted mean dissociation constants of the organic acids. Although the forest floor solutions were strongly acidic (pH 3.47–4.10), a considerable proportion of the organic acids was dissociated and organic anions represented 22–40% of the total anions in the mineral soil input. The flux of DOM-associated exchangeable protons from the forest floor to the mineral soil ranged from 0.35 (Wülfersreuth) to 3.72 (Hohe Matzen) kmol ha?1 yr?1. In the subsoil, this organic acidity may be neutralized by microbial decomposition of the organic acids, but a part of the hydrogen ions may dissociate and contribute to acidification of the soil solution and to weathering processes. Due to the pronounced retention of DOM in the mineral subsoil horizons, the contribution of DOM to the output of cations and acidity from the soil is much lower than in the surface horizons but still significant.? 相似文献
995.
Precision of soil moisture measurements done with “Time Domain Reflectometry” and “Frequency Domain Probes” in heterogeneous forest soils Using “Time Domain Reflectometry” (TDR) and “Frequency Domain” (FD) technique soil moisture of a homogenized soil- substrate of silty loam was measured in the lab as well as soil moisture of the same silty loam and of two soils with coarser texture and more heterogeneous structure in situ. These measurements were compared with gravimetric soil moisture measurements done at the same measuring sites. Thus the measuring errors caused by soil heterogeneities should be assessed. The standard error of both, the TDR- and the FD- probes amounted to less than 1 Vol%, at the in situ measurements as well as in the homogenized substrate. In the homogenized substrate under relatively dry conditions soil moisture was overestimated to about 2 Vol% by both electronical methods, which is most likely the result of compactions in the contact zone between rods and the soil caused by the insertion of the rods. In the field both electronical methods, however, underestimated the soil moisture up to 14 Vol%. This applied especially to the surface of the mineral soil and under the influence of high stone contents. This deviation is interpreted as an effect of gaps along the rods, caused by the insertion. In loosely packed and stony upper soils we propose therefore to install the rods in homogenized autochtoneous soil material having settled to its natural bulk density instead of inserting them into the natural layered soil. 相似文献
996.
In the last decades many aspects of nitrogen turnover have been studied by 15N methods. In this article contemporary 15N tracer as well as natural 15N abundance methods for the study of animal manure turnover are briefly reviewed. The nitrogen dynamics after application of farmyard manure and slurry are elucidated. Here, emphasis was put on results from 15N stable isotope work in the fields of nitrogen immobilization, nitrogenous trace gas emissions, turnover of organic nitrogen fractions, and finally plant uptake. Added nitrogen interactions, which must be considered when interpreting 15N studies, are discussed. Finally promising research fields for the use of stable isotopes are outlined. 相似文献
997.
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999.
Gisbert Schalitz Dieter Hölzel Manfred Fechner Klaus‐Dieter Robowsky 《Archives of Agronomy and Soil Science》2013,59(5):363-378
Niederungsgrünland ist für den Anbau von Gräsern als nachwachsende Rohstoffpflanzen zur Biomasseproduktion prinzipiell geeignet. Auf Niedermoorstandorten erwies sich Phalaris arundinacea als leistungsfähige und technologisch vorteilhafte Art. Auf Sand‐Humus‐Gley brachte Miscanthus sinensis günstige Ergebnisse hinsichtlich Ertragsleistung und Wasserverwertung. Umwelbelastungen durch Nährstoffaustrag ins Grundwasser ergaben sich nur bei mangelhafter Entwicklung der Pflanzenbestände (z. B. Nichteignung von Miscanthus für Niedermoor) bzw. überhöhter Düngung. Hauptverwendungszweck der geprüften Gräser dürfte auf dem Energiesektor liegen. Brennstoff‐ und Ascheparameter sind mit denen des Getreidestrohs vergleichbar. Die Biomasse könnte aufgrund der ermittelten Qualitätsparameter auch zur Herstellung von Papier und Verpackungsmaterial verwendet werden. 相似文献
1000.
Rollinger JM Spitaler R Menz M Marschall K Zelger R Ellmerer EP Schneider P Stuppner H 《Journal of agricultural and food chemistry》2006,54(22):8432-8436
In organic apple orcharding there is a continuous need for natural fungicides effective against Venturia inaequalis (Cooke) Winter, the causal agent of apple scab. In this study an in vitro assay is presented for determining the germination inhibitory potential of extracts and pure compounds. From a screening of plant extracts, the methanol extract of Morus root bark revealed distinct V. inaequalis inhibiting qualities, which were subjected to a bioguided fractionation. Among the isolated metabolites [moracins M (1), O/P (2), kuwanon L (3), and sanggenons D (4), B (5), G (6), O (7), E (8), and C (9)] all the Diels-Alder adducts (3-9) showed an antifungal activity with IC50 values between 10 and 123 microM. The in vitro activity of the most active fraction (A5, IC50 39.0 +/- 4.2 microg/mL) was evaluated in vivo, confirming a distinct antifungal activity against V. inaequalis for the tested natural material. 相似文献