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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of root distribution of corn with fertilizer placement and frequency of irrigation in lysimeters (1991)
    Springer
    Nutrient cycling in agroecosystems 28 (1991), S. 49-54 
    Details
    ISSN: 1573-0867
    Keywords: Fertilizer placement ; irrigation frequency ; root distribution ; corn ; lysimeters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a factorial design lysimeter experiment with corn, in a sandy loam soil, two irrigtion frequencies (low (IL) and high (IH)) and two ways of fertilizer placement (shallow (FS) and deep (FD)), were applied. The plants did not suffer from stress under either water regime. Tillering, degree of grain filling and distribution of nitrogen between the grain and vegetative plant parts, indicated an enhanced plant development in the FS treatment. The IH-FS treatment showed the highest root density in the upper soil layer and the highest grain yield and reduced-nitrogen yield in grain. Results indicate that fertilizer placement influences root density distribution in the soil profile and consequent corn yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048855
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphate rocks and partially-acidulated phosphate rocks as controlled release P fertilizers (1993)
    Springer
    Nutrient cycling in agroecosystems 35 (1993), S. 25-31 
    Details
    ISSN: 1573-0867
    Keywords: Partially acidulated phosphate rocks ; phosphate rock dissolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Properties of phosphate rocks (PRs) and partially acidulated phosphate rocks (PAPRs) which affect the pattern of P dissolution and thus the potential for manipulating the rate of P release are reviewed. The effects of soil and plant properties are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750217
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Interaction of salinity and enhanced ammonium and potassium nutrition in wheat (1993)
    Springer
    Plant and soil 154 (1993), S. 133-137 
    Details
    ISSN: 1573-5036
    Keywords: ammonium nutrition ; potassium nutrition ; salinity ; Triticum aestivum L. ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Wheat (Triticum aestivum L.) was grown to maturity in a pot experiment in a calcareous silty sand soil. N was applied at two levels as granulated N-P fertilizers, amended or not with nitrification inhibitors (1% and 5% DCD, 1% N-serve). Potassium as KCl was given at three levels of application. P was applied at a uniform rate. Two levels of salinity were obtained by using the soil as such (EC= 0.3 mmho/cm) and by adding NaCl to the same soil (EC=2.4 mmho/cm). 1% DCD and 1% N-serve treatments gave significantly higher wheat grain yields and N-uptake than the other ones. Nitrate content of leachates indicated a prevalent nitrate nutrition in the treatment without nitrification inhibitors. The 5% DCD treatment showed a yield depression. In the lower N level treatments, a significant yield increase, generated by 1% DCD and N-serve was found in the salinized soil as compared to the non-saline soil. Soil salinity reduced N-uptake when nitrification inhibitors were not present. In treatments having the inhibitors, N-uptake was equal or greater in the salinized than in the non saline soil. An enhanced ammonium nutrition increased the P uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011082
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  • 5
    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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    Paper (German National Licenses)
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