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  • 1
    Electronic Resource
    Electronic Resource
    Solubility of Calcium Phosphate in Calcareous Soils (1962)
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 1211-1212 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A series of soil mixtures varying in their calcium carbonate content was prepared by mixing two soils, one low in calcium carbonate and the second, highly calcareous. Other measured properties of the two soils used in the mixtures were similar (Table 1). Table 1. SOME OF THE PROPERTIES OP THE Two ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1931211a0
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of availability of phosphorus from granulated and powdered superphosphate by calculations of yield curves related to the phosphorus added and found in soil and plant tests (1957)
    Springer
    Plant and soil 9 (1957), S. 114-130 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The efficiency of superphosphate in granular and powder form was compared in four typical Israeli agricultural soils in a greenhouse investigation. Under greenhouse conditions no advantage was found for the granular form either in the first crop (clover) or in the second following crop (corn). The efficiency of superphosphate forms was evaluated from Mitscherlich yield curves by comparing the constants which determine the slopes of the curves (c). Soil samples were taken from the pots and soluble phosphorus in three different extractions was related to the relative yields obtained. The NH4F extract gave a fairly good correlation for both crops tested and all experimental soils included. The NaHCO3 extract gave a good correlation for the clover crop. Phosphorus was determined in the clover plants and the amount of phosphorus extracted by plants was related to soil tests. Generally, very good correlations were obtained if they were calculated individually for each soil. Laboratory experiments showed that the added water-soluble phosphorus is relatively quickly fixed into insoluble forms (in water and NaHCO3 solution) in three out of four soils. In the fourth, a coarse-textured soil, the fixation power is relatively low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398920
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Lowering ammonia volatilization losses from urea application by activation of nitrification process (1981)
    Springer
    Nutrient cycling in agroecosystems 2 (1981), S. 101-107 
    Details
    ISSN: 1573-0867
    Keywords: ammonia volatilization ; nitrification rate ; urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The aim of this work was to lower ammonia volatilization losses by increasing the rate of nitrification. This was achieved by eliminating the gap in timing between urea hydrolysis and ammonium nitrification. Soils were pretreated with a small amount of ammonium salt which led to the activation of the nitrification process. When nitrification passed its lag period, urea was applied to the soils. Ammonium produced by urea hydrolysis was quickly oxidized into nitrate and did not accumulate in the soil. This resulted in decreased ammonium concentrations in soil, and consequently, in decreased ammonia volatilization losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080096
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  • 7
    Electronic Resource
    Electronic Resource
    Partially acidulated phosphate rocks: Phosphorus release characteristics (1990)
    Springer
    Nutrient cycling in agroecosystems 22 (1990), S. 109-117 
    Details
    ISSN: 1573-0867
    Keywords: Partially acidulated phosphate rock ; inorganic phosphate fractionation ; phosphate dissipation ; phosphate release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Five phosphate rocks varying in formic acid P solubility from 18.9 to 52.7%, expressed as percentage of total P, were acidulated with phosphoric or sulphuric acids to 0, 20%, 33% and 50% of full acidulation and granulated. In an incubation experiment fertilizer granules of diameter 1–2 mm were mixed with two acid soils and after 1 week incubation soil samples were extracted with a 0.5 M NaOH solution. In a dissipation experiment single fertilizer granules of 4 mm diameter were implanted into soil, incubated for 1 and 4 weeks and inorganic P fractionation in the residual granules and the surrounding soil was performed. Dissipated P was greater than the water soluble P content of the partly acidulated phosphate rock fertilizers indicating the dissolution of the non-acidulated phosphate rocks. The amount of P dissipated was related to the initial water soluble P content and to the formic acid solubility of phosphate rocks used for manufacturing the fertilizers. The P dissipated increased with an increase in soil acidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01116184
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  • 8
    Electronic Resource
    Electronic Resource
    Strategy for development of fertilizer solutions for greenhouse tomatoes (1990)
    Springer
    Nutrient cycling in agroecosystems 26 (1990), S. 53-60 
    Details
    ISSN: 1573-0867
    Keywords: Greenhouse tomatoes ; fertilizer solutions ; fertilizer development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A study of fertilization practices in intensively grown tomatoes, leading to a projection of developments in fertilizer usage is presented. Targets of optimal fertilization strategy were defined as follows: maximize fruit yield; maximize fruit quality; minimize environmental pollution with fertilizers; minimize corrosion of the fertilizer distribution system; minimize expenses on fertilizers. Information was gathered by literature searches and by personal interviews and visits to research institutes and growers. Rechecking of some fertilization practices for greenhouse tomatoes grown in detached media is proposed. The review indicates that the following should be rechecked: ammonium/nitrate ratio in fertilizer formulations; use of urea in fertilizer solutions; levels of phosphates applied; levels of sulphate applied; simple iron salts vs. chelated iron application; osmotic potential (OP), expressed as electrical conductivity (EC), of the nutrient solution at various growth stages. EC, pH and estimated prices of fertilizer solutions were calculated and presented in tables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048743
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  • 9
    Electronic Resource
    Electronic Resource
    Uneven distribution of banded fertilizer nitrogen in the field related to computer modelling (1982)
    Springer
    Nutrient cycling in agroecosystems 3 (1982), S. 379-383 
    Details
    ISSN: 1573-0867
    Keywords: band placement ; computer modelling ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A model was developed to describe the distribution of mineral nitrogen when applied in a fertilizer band, taking into account nitrification and diffusion. Good agreement was found between the calculated values and those measured in a field experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048941
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  • 10
    Electronic Resource
    Electronic Resource
    Fertigation for minimizing environmental pollution by fertilizers (1995)
    Springer
    Nutrient cycling in agroecosystems 43 (1995), S. 5-7 
    Details
    ISSN: 1573-0867
    Keywords: fertigation ; fertilizer application ; irrigation ; nutrients requirements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Intensification of agriculture by irrigation and enhanced use of fertilizers may generate pollution by increased levels of nutrients in underground and surface waters. Most of the irrigation is by open systems having a relatively low efficiency of water application. A higher efficiency may be gained by pressurized irrigation systems. Drip irrigation generates a restricted root system requiring frequent nutrient supply that may be satisfied by applying fertilizers in irrigation water, i.e. by fertigation. Maximization of crop yield and quality and minimization of leaching below the rooting volume may be achieved by managing fertilizers concentrations in measured quantities of irrigation water, according to crop requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00747675
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