ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Improvement of the physical fertility of a degraded Alfisol with planted and natural fallows under humid tropical conditions (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 17 (2001), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Topsoil (0–15 cm) bulk density, aggregate stability, soil dispersibility, water retention and infiltration were measured between 1989 and 1996 on an Alfisol under rehabilitation in southwestern Nigeria. The planted leguminous species were Pueraria phaseoloides, Senna siamea, Leucaena leucocephala, Acacia leptocarpa and A. auriculiformis. Also, plots with natural fallow and maize/cassava intercropping were included. Level (minimum) and mound tillage with hoes was adopted for the cultivated areas under study after 4 and 6 year fallow periods. Under fallow, the soil bulk density decreased from1.56 to 1.11 t m73.The continuously cropped treatment (level tillage) had significantly higher bulk density than the fallowed subplots after 6 years. Mean soil penetrometer resistance ranged from 75 to 157 kPa for fallowed plots and from 192 to 295 kPa for the continuously cropped (level tillage) subplot. Surface soilwater contentswere similar for all the treatments during the soil strength measurements. Although soil aggregates were generally of low stability and not well formed, they were improved by fallowing.Soil structural improvement by planted fallows was similar to that by natural fallow, but the trees were more promising for long-term fallow (〉6 years) than the herbaceous P. phaseoloides. However, the improvement in soil structure after 4 or 6 year fallow could not be maintained in subsequent cropping. Furthermore, the significant improvement in soil bulk density caused by A. auriculiformis and natural fallow was more rapidly lost on the cultivated subplots compared with other fallow treatments. Thus, soil structure recovery under a fallow does not imply a sustained improvement when stress is applied to this soil. Post-fallow soil management options such as residue incorporation and tillage to ameliorate compaction or soil strength will be necessary to enhance the improvements by fallow species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.2001.tb00006.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Tillage systems and soil properties in West Africa
    Amsterdam : Elsevier
    Soil & Tillage Research 27 (1993), S. 149-174 
    Details
    ISSN: 0167-1987
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0167-1987(93)90066-X
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Water relations of three cowpea cultivars (Vigna unguiculata, L.) (1980)
    Springer
    Plant and soil 56 (1980), S. 59-69 
    Details
    ISSN: 1573-5036
    Keywords: Abscission ; Diffusive resistance ; Moisture stress ; Root system ; Soil water potential ; Stomatal behaviour ; Water use efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of soil water stress imposed at different growth stages of three cowpea varieties, namely, ‘Adzuki’ (an erect type), ‘Ife Brown’ (semi erect) and ‘New Era’ (a spreading type) on growth, floral abscission and yield were investigated in the greenhouse. Stomatal density, aperture and behaviour as influenced by soil water potential was also evaluated. Root system development, grain yield, soil water content and potentials were determined in a field experiment. Soil moisture stress significantly reduced the growth and yield (34–46%) of the three cowpea cultivars. Although grain yield reduction was highest (36.8%) when stress was imposed at flowering/podding stage for ‘Ife Brown’, the variety New Era showed no reduction in yield. Floral abortion which increased with a decrease in matric potential may also be linked with imperfect aeration conditions. The choice of these cultivars for intercropping purposes should take cognisance of depth of rooting, lateral root spread, and root density, which affect water extraction at different soil depths, leaf area index, stomatal density, aperture and behaviour to decreased soil water potential all of which differed widely amongst the cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197953
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Varietal influence of intercropped cowpea on the growth, yield and water relations of maize (1981)
    Springer
    Plant and soil 62 (1981), S. 153-156 
    Details
    ISSN: 1573-5036
    Keywords: Cowpea variety ; Diffusive resistance ; Intercropping ; Leaf water potential ; Soil water potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of three cowpea varieties namely, NewEra (a spreading type), Adzuki (an erect type) and Ife Brown (semi-erect) intercropped with maize on growth, yield and water relations of maize were investigated in the greenhouse and in the field. Cowpea varietal effects were significant on soil water extraction but insignificant on the performance of maize.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205036
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Effects of water table depth and calcium perioxide application on cowpea (Vigna unguiculata) and soybean (Glycine max) (1981)
    Springer
    Plant and soil 63 (1981), S. 275-281 
    Details
    ISSN: 1573-5036
    Keywords: Calcium peroxide ; Cowpea ; Soybean ; Water table depth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of three water table (WT) depths (0, 15 and 40 cm) and calcium peroxide (Calper) on the growth and yield of cowpea (Vigna unguiculata, L.) and soybean (Glycine max) were investigated in field lysimeters for a sandy loam soil. Cowpea growth was the best at 40 cm WT depth. Leaf area, plant height, dry matter production, number of leaves and pods, grain yield and consumptive water use of cowpea increases with deeper (lower) WT depth. Application of calcium peroxide improved per cent emergence, leaf area, dry matter, number of leaves and pods, weight of 100 seeds, grain yield and water use in cowpea. The optimum WT depth for vegetative growth of soybean was 15 cm, although the highest grain yield was obtained at 40 cm WT depth. Number of pods, grain yield and water use efficiency of soybean increased with deeper water table depth. Application of calcium peroxide to soybean increased number of leaves and pods per plant, and grain yield for the 15 cm WT depth treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374605
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Growth, development and yield of pawpaw (Carica papaya L.) ‘Homestead selection’ in response to soil moisture stress (1986)
    Springer
    Plant and soil 93 (1986), S. 427-435 
    Details
    ISSN: 1573-5036
    Keywords: Critical soil water potential ; Moisture sensitive stages ; Pawpaw ; Soil moisture stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of four soil water potential regimes under greenhouse conditions on growth, development, and yield of ‘Homestead selection’ pawpaw were investigated. The objectives were to determine the critical soil water potential regime and the moisture sensitive stages of growth of pawpaw. Repeated cycles of stress to −6.0 bar soil water potential imposed as from vegetative phase prevented fruit formation by constantly causing flower abscission. The stressed plants were stunted in size. The −2.0 bar soil water potential value was considered the critical level for normal growth and reproductive development of pawpaw. The mid-vegetative, flowering and fruit enlargement phases were moisture sensitive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374293
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Drought susceptibility of two tomato (Lycopersicum esculentum) varieties (1980)
    Springer
    Plant and soil 55 (1980), S. 205-214 
    Details
    ISSN: 1573-5036
    Keywords: Drought ; Leaf diffusive resistance ; Leaf water potential ; Root system ; Soil moisture potential ; Tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of three levels of moisture under greenhouse conditions and also identical moisture levels under field conditions, on the growth yield and water relations of two tomato cultivars, Fireball and Ife I, were investigated. The objective was to ascertain the drought susceptibility of these two tomato cultivars. The cultivar, Ife I, was more drought susceptible than Fireball and the drought susceptibility increased with the level of soil water stress. The drought tolerance, of Fireball is attributed to a lower leaf area, better root system development in terms of average root length and rooting depth, and a higher leaf water potential. The higher leaf stomatal resistances of Fireball variety suggest an inbuilt mechanism to regulate water vapour flow in times of stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181800
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Subsoil gravel horizon and maize root growth (1977)
    Springer
    Plant and soil 46 (1977), S. 337-346 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A series of factoral experiments involving the effects of gravel concentration in the subsoil horizon, the effect of inter-gravel bulk density, the depth of the surface soil above the gravel horizon and the interaction between soil moisture regime and gravel concentration, on growth and development of maize roots were conducted in the greenhouse. Increasing sub soil gravel concentration decreased the total porosity and the available waterholding capacity. Though the root growth of maize seedlings was adversely affected by gravel concentration above 20 per cent, lower concentration of gravels had a beneficial effect on roots. The root development and the leaf concentration of N, P and K improved with increasing depth of surface soil above the gravel horizon. The symptoms of mechanical impedance, such as thickening of root tips and profuse branching behind the tip were commonly observed on the root axis penetrating the gravelly horizon. re]19750916
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010090
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Subsoil gravel horizon and maize root growth (1977)
    Springer
    Plant and soil 46 (1977), S. 347-357 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of gravel concentration, size of gravel and inter-gravel texture on root growth and development of maize seedlings was investigated in a greenhouse study. The adverse effect of naturally compacted gravel horizon of an alfisol on maize root growth was also studied in a field experiment. Gravel concentration of above 10 to 20 per cent by weight significantly reduced rate of root elongation and produced symptoms typical of mechanical impedance. The inhibitory effect of gravels was more pronounced for small rather than large gravels and for coarse rather than fine inter-gravel texture. The natural gravel horizon of an alfisol definitely inhibited rate of root elongation, total root volume, number of roots and depth of root penetration. re]19750916
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010091
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    facet.materialart.
    Unknown
    Genetic Variants of Glucose 6-Phosphate Dehydrogenase from Human Erythrocytes: Unique Properties of the A- Variant Isolated from "Deficient" Cells (1972)
    National Academy of Sciences
    Details
    Publication Date: 1972-04-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...