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  • 1
    Electronic Resource
    Electronic Resource
    Participation of soluble and oxidizable soil organic compounds in denitrification (1985)
    Springer
    Biology and fertility of soils 1 (1985), S. 209-213 
    Details
    ISSN: 1432-0789
    Keywords: Denitrification ; Soluble organic carbon ; Electron donors ; Oxygen consumption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The role of soluble organic carbon (SOC) in denitrification in four mineral soils and one organic soil was evaluated in laboratory studies. Denitrification capacities and SOC concentrations were determined by nitrate loss from air-dried flooded soil treated with a solution containing 100 μg/ml N03 −-N, while the rate of consumption was measured by Warburg manometry on 20 g air-dried soils to which 10 ml water had been added. High correlation coefficients (r 〉 0.93) were obtained between denitrification capacities, SOC, and oxygen consumption in the five soils. A mineral soil was amended with extracts of an organic soil. After incubating for 1 week, denitrification capacity was enhanced and SOC concentrations decreased in that soil. Extracted mineral soil had a lower denitrification capacity than an unextracted one. Decreases in concentrations of SOC were related to color change. Infrared spectra of precipitates from soil extracts indicated that absorption at wave number 1420–1440 cm -1 was also related to the color changes. It was implied that low molecular weight fulvic acid like compounds represented the SOC mineralized in denitrification, and that their supply to soil solution by solubilization of organic matter influenced the denitrification rate in the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257639
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  • 2
    Electronic Resource
    Electronic Resource
    Correction of lime-induced chlorosis by application of iron and potassium sulphates (1987)
    Springer
    Nutrient cycling in agroecosystems 13 (1987), S. 161-167 
    Details
    ISSN: 1573-0867
    Keywords: lime-induced chlorosis ; iron sulphate ; potassium sulphate ; ammonium sulphate ; chlorophyll content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of: iron sulphate in an acid urea medium, potassium sulphate, three mixtures of potassium sulphate with iron sulphate, a mixture of potassium chloride with iron sulphate, ammonium sulphate with nitrification inhibitor (DCD) plus iron sulphate and, finally, sequestrene, in correcting iron chlorosis in peanuts (Arachis hypogea) on a soil containing 65% CaCO3, pH 7.6, known to induce chlorosis, were tested in pot experiments. The potassium sulphate-iron sulphate mixtures were as effective as sequestrene or more so in correcting chlorosis. The potassium chloride mixture and the ammonium sulphate-DCD-iron sulphate mixture were less effective, the latter probably because of ammoium toxicity. Iron sulphate or potassium sulphate alone had no effect. The effective correction of iron chlorosis requires simultaneous application of iron and potassium sulphates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064829
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of ammonium and nitrate nutrition with potassium in wheat (1988)
    Springer
    Nutrient cycling in agroecosystems 17 (1988), S. 137-146 
    Details
    ISSN: 1573-0867
    Keywords: Ammonium-nitrate-potassium interaction ; accumulation of reduced nitrogen ; wheat ; nitrification inhibitor ; grain ; stover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A greenhouse experiment with wheat in 3L pots filled with a sandy loam soil in a factorial design was conducted to determine the effect of potassium on nitrogen utilization. Nitrogen was applied in three NH4-N/NO3-N ratios, 0/100, 25/75 and 50/50, at three levels: 0.75, 1.50 and 3.00gN/pot, and potassium was applied at three levels: 0, 0.5 and 1.0gK/pot. The higher levels of nitrate nitrogen with or without potassium reduced dry matter yields drastically, while the same levels of a NH4-N/NO3-N mixture of 50/50 with applied potassium reduced yields only slightly. Highest grain yield and total yield were obtained with a 25/75 mixture of ammonium/nitrate nitrogen with added potassium. Potassium addition to soil increased the utilization of nitrogen fertilizers, particularly when the ratio of ammonium to nitrate was increased. The highest uptake of reduced nitrogen was at the highest level of the ammonium to nitrate nitrogen ratio (50/50) when potassium was applied. Tillering was enhanced by an increased ammonium ratio in the nitrogen mixture, and by potassium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01050274
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  • 4
    Electronic Resource
    Electronic Resource
    Efficiency of fertilizers as nitrogen sources to banana plantations under drip irrigation (1985)
    Springer
    Nutrient cycling in agroecosystems 8 (1985), S. 101-106 
    Details
    ISSN: 1573-0867
    Keywords: ammonium-nitrate-nutrition ; banana fertilization ; drip irrigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a field experiment with bananas under drip irrigation in the semiarid and warm Jordan Valley, on a highly calcareous soil, application of urea, ammonium nitrate and potassium nitrate were compared. All treatments received equal amounts of N, P and K. The rate of growth and yield were higher on plots receiving urea and ammonium nitrate than on those receiving potassium nitrate. This was explained by a continuous balanced nitrate-ammonium-nitrogen nutrition in the first two treatments, while in the potassium nitrate treatment more nitrate than ammonium was available to the plants during the earlier growth period. Ammonium concentrations found in the soil profile indicate a partial inhibition of nitrification in the drip-irrigated system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048893
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  • 5
    Electronic Resource
    Electronic Resource
    Effectiveness of partially acidulated phosphate rock as a source to plants in calcareous soils (1985)
    Springer
    Nutrient cycling in agroecosystems 8 (1985), S. 117-127 
    Details
    ISSN: 1573-0867
    Keywords: calcareous soil ; partially acidulation ; phosphate rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a series of greenhouse experiments granulated phosphate fertilizers prepared by mixing triple superphosphate with phosphate rock and partially acidulated phosphate rock, ranging in their content of water souble P from 95 to 17 per cent of total P were applied to neutral and slightly alkaline (pH 6.9–7.8), sandy loam to clay soils ranging in calcium carbonate content from 2 to 35 percent. Dry matter yield of clover, alfalfa, millet or maize were obtained, P uptake determined and sodium bicarbonate extractable P in soil measured. In one field experiment triple superphosphate was compared to mixture of triple superphosphate and phosphate rock on maize. X ray difraction on one triple superphosphate — phosphate rock mixture and on one partially acidulated phosphate rock showed that both fertilizers contain mainly monocalcium phosphate and fluorapatite. After incubation in soil the dicalcium phosphate content rose and the monocalcium phosphate disappeared. Parameters received in greenhouse experiments and in the field indicate that phosphate fertilizers composed of superphosphate and up to 50 percent phosphate rock are as efficient source of P to plants on calcareous and slightly alkaline soils as superphosphate. If this indication would be proven in extensive field experimentation it would lead to savings in acid consumption and in fertilizer manufacturing plant capacity for calcareous soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048895
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  • 6
    Electronic Resource
    Electronic Resource
    Model of ammonia volatilization from calcareous soils (1987)
    Springer
    Plant and soil 103 (1987), S. 205-212 
    Details
    ISSN: 1573-5036
    Keywords: ammonia volatilization ; calcareous soils ; CEC ; nitrogen ; nitrogen losses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A quantitative model of ammonia volatilization from the calcareous soil uppermost 1-cm layer was developed and tested. The model accounts for the following processes: ammonium-ammonia equilibration in the soil solution, cation exchange between calcium and ammonium which results in ammonium distribution between soil liquid and solid phases, nitrification of dissolved ammonium, distribution of ammonia between liquid and gaseous phases and diffusion of gaseous ammonia in the soil air. The combined effect of various characteristics such as soil pH, cation exchange capacity, water capacity and nitrification rate on ammonia losses from various soil types have been studied. The model was validated against experimental results of ammonia losses from different soils for its use as a predicting tool. The model shows that most of ammonia losses can be explained by the interactive effect of high soil pH and low cation exchange capacity. Computations show increased ammonia volatilization with decreasing soil water capacity. Increasing fertilizer application rate has a small effect on percentage of ammonia losses. Increased nitrification rate and shorter “lag” period of nitrification reduce ammonia losses considerably. Good agreement was obtained between model calculations and experimental results of ammonia volatilization from 13 soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370390
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