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
    Mineralogical and chemical composition of three tuffs from northern Israel
    Amsterdam : Elsevier
    Geoderma 63 (1994), S. 123-144 
    Details
    ISSN: 0016-7061
    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/10.1016/0016-7061(94)90002-7
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Pseudomonas cepacia–Mediated Rock Phosphate Solubilization in Kaolinite and Montmorillonite Suspensions (1999)
    Springer
    Soil Science Society of America journal 63 (1999), S. 1703-1708 
    Details
    ISSN: 1435-0661
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Pseudomonas cepacia is known as a rock phosphate (RP) solubilizer in bioreactors and in soils. The objectives of this study were to determine the production rates of gluconic acid (GA, pKd 3.41) and 2-ketogluconic acid (KGA, pKd 2.66) by the bacteria in the presence of clay minerals which prevail in soils, and the resulting rate and extent of orthophosphate (OP) release into the suspension solutions. Suspensions (1:40) of RP, RP + Ca–kaolinite (CaKL), RP + Ca–montmorillonite (CaMT), and RP + K–montmorillonite (KMT) were inoculated with P. cepacia E37. The electrical conductivity (EC) and pH, and the OP, glucose, GA, KGA, Ca, and Al concentrations were determined in the suspension solutions as functions of time. In a given clay system, the rate-limiting step in RP dissolution was the rate of GA release by the E37. This acid lowered the pH of all the clay suspensions to 2.7 to 2.8, which resulted in a pronounced increase in the OP concentration in solution, Cp. As glucose was depleted from the system, the KGA concentration increased with a concomitant lowering in pH to ≈2.5. At this pH, a sharp decline in Cp occurred, which was attributed to Al release by the alumosilicates, and formation of a new, stable Al–P or Fe–P solid phase. The E37 glucose oxidation efficiency (GOE) was considerably inhibited in CaKL as compared with CaMT or KMT. The GA and KGA adsorption by the clays or their Ca complexation did not play a role in the E37-mediated RP solubilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effect of high frequency surface and subsurface drip irrigation on root distribution of sweet corn (1991)
    Springer
    Irrigation science 12 (1991), S. 135-140 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Characterization of root growth and distribution is fundamental in explaining crop responses to irrigation and in determining appropriate management of irrigation systems, particularly with drip systems since it is widely believed that drip irrigation may limit the extent of root development. An experiment was conducted to study root distribution of sweet corn grown under high frequency surface (S) and subsurface (SS) drip irrigation, fertilized daily through drip systems at three phosphorus levels of P0 (no injected P), P1 (P injected at 67 kg/ha) and P2 (P injected at 134 kg/ha). Root sampling at the end of the growing season indicated that: (1) Root extension continued at depths in excess of 2 m in both the surface and subsurface drip at all P levels. (2) The greatest differences between SS and S treatments were observed in the top 45 cm depth. Higher root length density was observed in the surface 30 cm in S plots while the sweet corn in the SS plots had greater root length density than S plots below 30 cm, and (3) the greater root length density in the SS irrigated sweet corn was not reflected in a similar increase in total above-ground dry matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192284
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effect of surface and subsurface drip fertigation on sweet corn rooting, uptake, dry matter production and yield (1991)
    Springer
    Irrigation science 12 (1991), S. 153-159 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Subsurface (SS) drip fertigation may increase sweet corn ear yield relative to surface (S) fertigation, because immobile nutrients are delivered at the center of the soil-root volume rather than on top of the soil. A container (1 × 1 × 1 m) experiment was conducted on a loessial soil (Haploxeralf) to test this hypothesis. Marketable and total ear yields were higher for tricklers placed 30 cm below the soil surface (3.22 and 4.90 kg m−2, respectively) than on the surface (2.86 and 4.30 kg m−2, respectively). Total fresh weight, dry matter production and plant height during the growing season were also greater for subsurface emitters. Deep trickler position significantly increased P and K content at the center of the root zone. The enhanced concentration apparently stimulated plant rooting which, together with the higher nutrient activity in the soil solution, increased P and K uptake rates, which in turn facilitated the higher dry matter production and commercial yield relative to surface trickler placement. The higher root activity in SS than in S fertigation was reconfirmed by soil air CO2 concentration measurements which showed significant differences between the two treatments during the growth season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192287
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Orthophosphate solubility in waters of different ionic composition (1995)
    Springer
    Nutrient cycling in agroecosystems 44 (1995), S. 73-78 
    Details
    ISSN: 1573-0867
    Keywords: P precipitation ; precipitation kinetics ; P solubility diagram ; pH ; octacalcium phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Orthophosphate (OP) is a major component of irrigation and nutrient solutions. Since OP precipitates may clog drippers, and deviations from intended OP concentrations may adversely affect plant development and yield, an understanding of the mechanisms controlling OP solubility in solutions of various ionic compositions, is essential. The objectives of this study were (i) to suggest guidelines for permitted OP additions to waters of various ionic compositions, so as to avoid OP crystallization and (ii) to predict the decrease in OP concentration as a function of time in supersaturated solutions. Five freshwater sources, used for irrigation in Israel, and representing extremes of pH and of Ca, HCO3 and SO4 concentrations, were tested. Solutions of three different initial OP concentrations (10, 30 and 90 mg Pl−1) and two pH values were prepared in 21 plastic bottles and kept in a dark room at 27 °C. Solution samples were withdrawn from the bottles at predetermined times, filtered and analysed for pH and total OP, Ca and HCO3 concentrations. In all the studied waters and for all initial OP levels the OP concentration (Cp) declined with time. The rate of decrease in Cp was proportional to the difference between the observed and equilibrium Cp values, with a specific rate constant for each water.The pH and the Ca2+ and HCO 3 − activities in solution were influenced by the initial Cp. The equilibrium Cp in all treatments was found to be controlled by octacalcium phosphate (OCP). Available chemical equilibria models allow to calculate the maximum level of OP that can be added to various waters before OCP precipitates, based on water pH and Ca, HCO3 and SO 4 2− concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750694
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Phosphate induced carboxylate and proton release by tomato roots (1997)
    Springer
    Plant and soil 191 (1997), S. 35-39 
    Details
    ISSN: 1573-5036
    Keywords: carboxylic anions ; P ; pH ; roots ; tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Exudation of carboxylic anions and protons by plant roots plays an important role in mobilizing soil P under P-deficiency conditions. The objective of this work was to quantify short-term (6 h) carboxylate and H+ exudation by tomato roots in response to P concentration (0, 0.1, 0.5 and 1.0 mt M P) in nutrient solution (Cp). The exudation rate of tri- and dicarboxylates decreased exponentially with increasing Cp, from 0.3 to 0.03 μmol plant−1 6h−1. At low Cp the predominant exudates were fumarate, citrate and succinate, while at Cp=0.5 and 1.0 mt M the prevalent anions were succinate and citrate. The solution pH declined sharply as Cp was lowered from 0.1 (pH=4.2) to 0 mt M P (pH=3.7).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004262730434
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Release of carboxylic anions and protons by tomato roots in response to ammonium nitrate ratio and pH in nutrient solution (1997)
    Springer
    Plant and soil 191 (1997), S. 27-34 
    Details
    ISSN: 1573-5036
    Keywords: carboxylic anions ; NH 4 + /NO 3 − ; pH ; roots ; tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The exudation of certain organic anions and protons by roots which may affect solubility of metals and P and uptake by plants, is affected by nitrogen form and pH. The objective of this work was to study exudation of carboxylates and H+/OH− by tomato plants in response to NH4/NO3 ratio and pH in nutrient solution. Four NH4/(NH4+NO3) ratios (R= 0, 0.33, 0.67 and 1) and constant vs. variable solution pH treatments were investigated. The sum of the exudation rates of all carboxylates tended to decline with increasing R, particularly tri- and dicarboxylates. The molar fraction of the exuded tri- and dicarboxylates, averaged over all treatments and plant ages, increased in the order tartarate ∼2%), malate (∼6%), succinate (∼15%), citrate (∼26%) and fumarate (∼46%). At R=1 the solution pH dropped from 5.2 to ∼3 and at R=0 increased to ∼8. The R corresponding to the pH stat of tomato plant was ∼0.3. For the constant solution pH treatment, the effect of solution pH on carboxylate exudation rate was small as compared to the effect of R. The exudation of citrate and H+ efflux which were initiated when NO3 and NH4 uptake rates per plant exceeded certain threshold values, increased with plant age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004214814504
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Drip nitrogen fertigation of ‘Starking Delicious’ apple trees (1989)
    Springer
    Plant and soil 119 (1989), S. 305-314 
    Details
    ISSN: 1573-5036
    Keywords: chlorophyll ; fruit size ; harvest date ; leaf analysis ; nitrogen fertilization ; soil analysis ; spur ; vegetative growth ; yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of ‘Starking Delicious’ (Malus domestica Borkh.) apple trees to four N fertigation treatments in drip irrigation (50, 150, 250 and 400 kg N ha−1, supplemented with a uniform dose of 400 kg K ha−1) was investigated in a field experiment during 6 years. Nitrate nitrogen in the soil was proportional (7–58 mg kg−1) to the applied N dose at the end of a 6 week fertigation period in the spring. At other times, the nitrate concentration in the soil was very low. Soil K decreased with depth and in the 0–30 cm soil layer it was negatively correlated with the applied N dose, before fertigation started. At the end of the spring fertigation period, higher K was found in all soil layers analyzed. Vegetative growth was correlated positively with the amount of N applied. Leaf chlorophyll and N were significantly lower only in the lowest N treatment, while increased fruit size and decreased fruit color were measured only in the higher N treatments. Yield was severely biennial. In the ‘On’ years crop load was heavier as less N was applied. An extremely high crop load in the lowest N treatment was followed by a reduced flower density and yield in the following season. In the ‘Off’ years, a significantly higher yield was obtained with the 150 kg ha−1 dose. The dry weights, N, P and K contents of the above ground parts of mature apple trees were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370423
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Effect of root volume and nitrate solution concentration on growth, fruit yield, and temporal N and water uptake rates by apple trees (1988)
    Springer
    Plant and soil 107 (1988), S. 49-56 
    Details
    ISSN: 1573-5036
    Keywords: fluxes of N and water uptake ; Golden Delicious ; irrigation ; Michaelis-Menten ; root volume ; trickle fertigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Meager information is available on the specific effects of root volume (V) and N concentration in the water (CN) on uptake rates of water and N by apple trees, as related to fruit yield and tree growth. To investigate this relationship, Golden Delicious/Hashabi trees were grown for 5 years in containers of 200, 50 and 101. Trees in the 200–1 containers were irrigated with a nutrient solution containing 10.7±1.3, 7.1±1.5 or 2.5±1.0 mM NO3. Trees in the remaining two container-volume treatments were uniformly supplied with a solution of 7.1±1.5 mM NO3. Elevated CN had no effect on the rate of water uptake, but increased the rate of N absorption by the trees from 2.4 to 4.8 g N tree−1 day−1 during July. The stimulated N uptake rate stemmed from enhanced fluxes of N uptake by the roots. CN had a negligible effect on root weight and root permeability to NO3 and water. The elevated N uptake rate did not result in greater fruit yield and growth, or greater N content in tree organs, indicating considerable release of N from living and decaying roots to the growth medium. Reducing the container volume decreased yield, total dry matter production and N and water uptake rates, but increased root permeability to NO3 and water, and total soluble solids in fruits. The all-season average CN in the irrigation solution above which N concentration in the transpiration stream was lower than the inflowing CN was 4.2 mM NO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371543
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Fluxes of P and Ca into intact corn roots and their dependence on solution concentration and root age (1971)
    Springer
    Plant and soil 35 (1971), S. 589-600 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fluxes of Ca and P through intact corn roots growing in flowing, well stirred nutrient solutions, were determined. The flux of Ca increased linearily when the Ca concentration in the nutrient solution was raised up to 250 ppm Ca. An increase in the P concentration from 0.02 ppm to 0.4 ppm P resulted in a higher Ca flux at each Ca concentration. A P concentration of about 0.15 ppm was found to be the saturation concentration above which the P flux through the roots increased only slightly. A Ca concentration range of 100 to 200 ppm had no apparent effect on the P flux. The flux through a certain unit of root surface area for both Ca and P dropped to nearly zero after 150 hours of active absorption. It is suggested that this is connected with the decrease in the specific surface area of the root with age, which is proposed to be due to the suberization which was observed microscopically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372689
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...