摘要:

Influence of Pydanon upon Stalk Length and Grain Yield of Winter Rye and Winter Wheat..In pot experiments with three varieties of winter rye a considerable reduction of stalk length was obtained by the growth regulator Pydanon without a significant reduction of grain yield. The necessary amount of active substance however was rather high and the period of time for optimal application was limited. Winter wheat did not respond to Pydanon.

ISSN:0044-3263    

DOI:10.1002/jpln.19751380202

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Uranium concentrations of soils, and their use for prospection.U3O8‐ concentration in about 300 samples, exceed but in few hydromorphous and subhydric materials 5 ppm, not so in A‐horizons of marsh soils and samples taken from deposits of the small streams and creeks to and from the Eifel‐maar's. Elevated U3O8‐concentrations observed in maar gyttja could be due to volcanic discharge into the maar.In uranium bearing crystallin regions (regions Mähring, Böhmerwald; Weißenstadt, Fichtelgebirge; Ellweiler, Nahesenke; Menzenschwand and Wittichen near Alpirsbach, Black Forest) all measurement indicated strongly elevated U3O8‐ concentrations, especially in creek deposits and gley soil, but not so in A and B horizons of terrestric soils (dystrophic cambisols) even in the core of the uranium bearing region. Thus, U3O8analysis in creek deposits and gleys can render assistance in uranium prospections.U3O8measurements in soil fractions are highest in the acid treated fractions ‘fulvic acid’ and ‘residue after humine precipitation’. Uranium contents relative to sample ‐ C are highest in the whole soil and extraction residue of the soil, pointing either to stronger link with the mineral part of the soil or to desorption of the uranium from the humic matter fractions in course of

ISSN:0044-3263    

DOI:10.1002/jpln.19751380203

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Linoleic acid and tocopherol contents of sunflower fruits as depending on different varieties and localities.Six sunflower varieties were grown in Germany, Romania and Zambia. All varieties showed a lower percentage in linoleic acid and a higher percentage in oleic acid if grown in Zambia. Additionally the ratio of α‐Tocopherol: linoleic acid was increased in all varieties.Wir danken der Deutschen Forschungsgemeinschaft für finanzielle Unterstützung und Fräulein V. Fischer für technische

ISSN:0044-3263    

DOI:10.1002/jpln.19751380204

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

AbstractLolium, perennecv.Billionwas grown at three different levels of nitrogen‐nutrition and at 15 °C and 30 °C respectively. Increasing doses of nitrogen stimulated the lipid‐, protein‐ and chlorophyll content in leaves and resulted in a promotion of linolenic acid.Low growth temperatures also favour the percentage of linolenic acid in leaves, galactolipids and chloroplasts. A process of adaptation to low temperatures and the maintenance of a certain membrane permeability is su

ISSN:0044-3263    

DOI:10.1002/jpln.19751380205

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Soil Chronosequences derived from Non‐Consolidated Sediments of the River Lech Terraces..During the glacial and postglacial periods 16 river terraces were formed in the Lech Valley. Their non‐eroded soils derived from carbonate rich gravel and from silt represent two chronosequences. The aim of this paper is to describe 9 series of the terraces No. 1, 8, 10, 13, 14 and 15 and to explain their genesis regarding the time as a soil forming factor.Due to the result of this paper the following conclusions were made:1It is assumed that the decalcification of the sediments started immediately after the terrace formation. With growth of vegetation the decalcification rate increased, with increasing age of the soils it decreased again.2Organic matter content of the soil remained constant for a long time.3Because of the high carbonate contents of the sediments the soils became acid very slowly. Even in the stadium of a brown earth (after approximately 3000 years) the grade of acidity is still minor.4The total CEC of the soils depends not so much on their age as on their thickness and their content of organic matter. The accretion of organic matter has the highest influence on the CEC increase in the initial stages of soil formation.5The silicate weathering started before the bulk sample was decalcificated completely.6Clay minerals were converted in the following way: Illite (mica) → Vermiculite → pedogenic Chlorite Smectites wheathered already in the stage of a brown earth (profile B3).7Clay illuvation took place shortly after the decalcification of the upper horizons. A reddish brown plasma was formed in the brown earths (B1, B2) and the red brown podsolics (L1, L2). It imparts the intensiv colour (5 YR 4/8) of the argillic horizons. The hue of this plasma is not due to a higher iron contents. It is presumed that the red plasma was formed during the Boreal, because the soils which derived from silt contain only a brown

ISSN:0044-3263    

DOI:10.1002/jpln.19751380206

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Untersuchungen über mikrobielle Dünger. I. Der Einfluß von silicatlösenden Bakterien auf die Kaliumaufnahme von Sorghum helepensis aus Kalkböden..In Gefäßversuchen wurde der Einfluß von silicatlösenden Bakterien auf die K‐Aufnahme von Sudangras aus Kalkböden untersucht, denen Sand bzw. Nilschlamm zugesetzt worden war. Obwohl in den behandelten Proben die Zahlen an silicatlösenden Bakterien höher waren, wurde gegenüber den unbehandelten Ansätzen keine signifikante K‐Mehraufnahme gefunden. Die Bakterienzahlen wie auch die K‐Aufnahme zeigten, unabhängig vom Carbonatgehalt, in allen Böd

ISSN:0044-3263    

DOI:10.1002/jpln.19751380207

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Pure protein, chlorophyll, carotene, and carbohydrates of Daucus carota throughout the vegetative period of first year as influenced by growth regulators (CCC, GA and BA).1) Carrot plants were treated for 9 weeks with gibberellic acid (GA3), benzyladenine (BA) and chlorcholinechloride (CCC). 2) Yield of carrot roots (g/plant) was reduced by GA, and changed insignificantly by CCC and BA. Leaf yield was increased with GA and BA, and decreased with CCC. 3) The quantity of pure protein in carrot roots (mg/plant) increased with CCC and decreased with GA and BA. Opposite results were obtained for leaves. 4) The quantity of hydrolysable carbohydrates (g/plant) in roots decreased with GA, BA and CCC. In leaves GA and BA increased the yield of carbohydrates whereas CCC decreased it. 5) The quantity of carotene (mg/plant) in roots decreased strongly with GA and negligibly with BA. CCC increased the yield of carotene. 6) The quantity of chlorophyll (mg/plant) increased with GA and decreased with CCC. BA increased chlorophyll during the first half phase of the vegetative period and decreased in the other half phase. 7) Following relations were calculated for the duration of the vegetative period: a) hydrolysable carbohydrates to pure protein of leaves and roots. b) carotene (in the roots) to pure protein (in the leaves) c) Carotene (in the roots) to carbohydrates (in the roots) d) carbohydrates to chlorophyll in the leaves, furthermore was calculated e) the storing power of the living system of leaves for carbohydrates in the roots. 8) The time curves for daily synthesis capacity of system of leaves or their storing capacity for products in the roots show that protein, chlorophyll and carotene of leaves behave as components of the system while carbohydrates (as expected) belog to the product. Contrary to that the daily storing capacity of the system of leaves shows that protein, carotene and carbohydrates in the roots belong to the product. Thus the root proves to be a genuine storage organ in which the major quantities of protein and carotene are not involved in the metabolic processes but can be regarded as stored or end products. .

ISSN:0044-3263    

DOI:10.1002/jpln.19751380208

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Effect of sub‐soiling on the physical characteristics of pseudogleys..Physical studies on eight soils that had been sub‐soiled over a range from two to twelve years before, showed that after two years the loosening of the subsoil was still god. The soils that had been sub‐soiled eight to twelve years before were only slightly better than the untreated ones. Available water capacity for plants could not be increased. On the other hand it was possible to decrease mechanical compactness of the soil and to cultivate the soil earlier in the

ISSN:0044-3263    

DOI:10.1002/jpln.19751380209

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Die jahreszeitliche Variation der Krümelstabilität.Die Krümelstabilität zeigt eine große jahreszeitliche Variation, welche für diese Lehmböden mittels einer sinusoidalen Kurve dargestellt werden kann, vorausgesetzt, daß keine Einflüsse einer mineralischen Düngung auftreten. Dieses bedeutet, daß ein Vergleich der Krümelstabilität mehrerer Böden oder Versuchsobjekte (zum Studium der Bodenstruktur und der physikalischen Bodenfruchtbarkeit) nur richtig ist, wenn die untersuchten Bodenproben zum gleichen Zeitpunkt entnommen worden sind.Die wichtigsten Ursachen der jahreszeitlichen Variation der untersuchten Böden sind die zahlreichen Risse in den Aggregaten, hervorgerufen durch meteorologische Einflüsse (Frost, Austrocknung), die Änderungen in der Zusammensetzung und Verteilung des organischen Materials im Boden und die Einflüsse einer mineralischen Düngung. Diese Schlußfolgerung bedeutet nicht, daß keine anderen Faktoren die jahreszeitliche Variation der Krümelstabilit

ISSN:0044-3263    

DOI:10.1002/jpln.19751380210

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

Changes of three‐layer clay minerals by native K in holocene loess derived soils of Central Germany and Lower Bavaria.Transformations of the clay minerals illite, vermiculite and smectite were determined in Central German (31 profiles) and Lower Bavarian loess districts (5 profiles) using 31–36 soil properties. To get significant differences between solum and sediment, the multivariate diskriminant analysis was applied.In the Central German loess district the following properties were crucial, to receive significant separation between solum‐horizons and sediments: smectite content, several values of potassium fixation, interlattice potassium. Important were also some parameter of the K‐Ca‐exchange curve: Activity ratio\documentclass{article}\pagestyle{empty}\begin{document}$ \left({\frac{{{\rm aK}}}{{\sqrt {{\rm aCa}}}}} \right) $\end{document}of a soil solution in equilibrium with a soil (ARo), buffering capacity of the soil for K at equilibrium (BCKE), labile K(K1), exchange capacity of the exchange sites with a specific affinity for K minus labile K(ECx—K1). The differences of these values can be explained by assuming that (at pH 6–7) the beidellitic layers of smectites of the parent loess were transformed to illitic layers in the solum‐horizons.In the Lower Bavarian loess landscape potassium fixation, total K in clay fraction (<2 μm) and the parameters of the K‐Ca‐exchange curve indicate the same clay mineral transformation as in Central Germany. Smectite values were not introduced to the diskriminant function, because they were highly significantly correlated with potassium fixation. In this case potassium fixation has caused a better separation between the solum‐horizons and the parent loess than X‐ray data.From these results, from total ‐K of the fraction 2–20μm (solum‐horizons smaller than sediments) and the vermiculite content fo the clay fraction, it can be concluded, that the rate of potassium release from micas and the rate of potassium fixation by beidellitic sheets during the Ho

ISSN:0044-3263    

DOI:10.1002/jpln.19751380211

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY