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  • 1
    Electronic Resource
    Electronic Resource
    Effect of liming on phosphate extracted by two soil-testing procedures (1987)
    Springer
    Nutrient cycling in agroecosystems 14 (1987), S. 143-152 
    Details
    ISSN: 1573-0867
    Keywords: lime ; soil testing ; Olsen P ; Mehlich P ; coprecipitation ; constant pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Lime and phosphate (P) additions had a variable effect on Olsen- and Mehlich-extractable P in 4 acid soils from Fiji. Olsen-extractable P was at a minimum between pH values of 5.5–6.0, on either side of which it increased, particularly in soils which received large amounts of added P. The initial decrease in Olsen-extractable P is attributed to the removal of P from solution by precipitation during the Olsen extraction. The increase at higher pH values is thought to be due to the slow release of P from precipitated Ca-P compounds. There was a consistent decrease in Mehlich-extractable P with increasing soil pH. When the pH of the Mehlich reagent was kept constant, using an autotitrator, there was no decrease in Mehlich-extractable P, suggesting that in the absence of pH control the decrease in extractable P was largely due to the neutralizing effect of lime on the Mehlich reagent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066607
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  • 2
    Electronic Resource
    Electronic Resource
    An evaluation of water extraction as a soil-testing procedure for phosphorus II. Factors affecting the amounts of water-extractable phosphorus in field soils (1988)
    Springer
    Nutrient cycling in agroecosystems 15 (1988), S. 225-236 
    Details
    ISSN: 1573-0867
    Keywords: Soil P test ; water extraction ; seasonal variation ; sampling depth ; fertilizer P addition ; microbial biomass P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of seasonal variation, sampling depth, and fertilizer P addition on water-extractable P values were investigated in two field experiments, involving soils of contrasting P retention capacity (Ramiha and Tokomaru) under permanent pasture over 12 months. The effects of the same parameters on Olsen-extractable P were also evaluated. The amounts of water-extractable P in soil were always lower than those of Olsen-extractable P. Over the 12-month period, the average value of water-extractable P in the unfertilized Ramiha soil (0–7.5 cm depth) was 1.8µg g−1 soil compared to an Olsen-extractable P value of 12.6µg g−1. The variability associated with water-extractable P at each sampling time was comparable with that for Olsen-extractable P. However, the relative seasonal variation over 12 months was larger for water-extractable P than for Olsen-extractable P. The results obtained with both extractants showed a seasonal fluctuation which was closely related to the pattern of pasture P uptake. The amounts of water- and Olsen-extractable P were higher in samples taken from the 0–4.0 cm than the 0–7.5 cm sampling depth. Fertilizer P addition resulted in larger increases in water-extractable P in the 0–4.0 cm sampling depth than in the 0–7.5 cm depth. The relative increase in water-extractable P following fertilizer P addition was larger than that of Olsen-extractable P. Seasonal changes in the soil microbial biomass P were not related to changes in either water-extractable P or plant uptake of P. Microbial biomass P may be a less sensitive index of soil P availability than is commonly thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051344
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  • 3
    Electronic Resource
    Electronic Resource
    An evaluation of water extraction as a soil-testing procedure for phosphorus I. Glasshouse assessment of plant-available phosphorus (1988)
    Springer
    Nutrient cycling in agroecosystems 15 (1988), S. 211-223 
    Details
    ISSN: 1573-0867
    Keywords: Soil P test ; water extraction ; plant-available P ; glasshouse experiment ; P-buffering capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A water extraction procedure was evaluated as a soil-testing procedure for phosphorus (P). In a glasshouse experiment using perennial ryegrass, the water extraction procedure was used to predict plant-available P in 20 New Zealand soils varying widely in P status and P retention capacity. Water-extractable P in the 20 soils was highly correlated with plant uptake of P (r = 0.90**). Although plant uptake of P and Olsen-extractable P were equally well correlated (r = 0.90**), relationships between plant uptake of P and Bray1 — and Truog-extractable P, and isotopically exchangeable P were less close. The prediction of plant-available P using water extraction was not improved by inclusion of an estimate of P-buffering capacity (obtained from P retention capacity or the slope of the P desorption isotherm), in contrast to the finding for Olsen-extractable P. Because the interpretation of the results obtained appears to be independent of P-buffering capacity and soil type, the water extraction procedure may have advantages over the other soil-testing procedures for P for soils containing reasonable amounts of water-extractable P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051343
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  • 4
    Electronic Resource
    Electronic Resource
    Lime-aluminium-phosphorus interactions and the growth of Leucaena leucocephala (1990)
    Springer
    Plant and soil 126 (1990), S. 1-8 
    Details
    ISSN: 1573-5036
    Keywords: aluminium ; aluminium toxicity ; Leucaena yield ; lime ; phosphorus ; phosphorus uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of lime and P addition on the amounts of soil extractable P and Al, and on the growth of the tropical legume Leucaena leucocephala were investigated in a factorial experiment under controlled climate conditions using 4 (Koronivia, Nadroloulou, Batiri, and Seqaqa) highly-weathered, acid (pH initially 3.9 to 4.9) soils from Fiji. Resin-extractable P increased with lime addition and then decreased above pH 5.5, whereas M KCl-extractable Al decreased to undetectable levels at or above pH 5.2. Plant growth was usually adversely affected at low and high pH, even in the presence of added P. The pH (in M KCl) at which maximum growth occurred in the 4 soils varied from approximately 4.4 to 5.2; values somewhat lower than those reported in the literature. Changes in dry matter yield with increasing soil pH were strongly influenced by P status and a positive lime × P interaction was obtained with 3 of the 4 soils. Above pH 5.2, liming decreased the yield of both tops and roots, for reasons which are discussed in part II. The data obtained for extractable soil P and plant P concentrations indicate that P deficiency is a major problem on these soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041363
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  • 5
    Electronic Resource
    Electronic Resource
    Lime-aluminium-phosphorus interactions and the growth of Leucaena leucocephala (1990)
    Springer
    Plant and soil 126 (1990), S. 9-17 
    Details
    ISSN: 1573-5036
    Keywords: aluminium ; aluminium toxicity ; aluminium-induced P deficiency ; chemical composition ; Leucaena ; lime ; Lolium perenne L ; perennial ryegrass ; phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of lime and P on the chemical composition of the tropical legume Leucaena leucocephala were studied in a controlled climate laboratory experiment using 4 (Koronivia, Nadroloulou, Batiri, and Seqaqa) highly-weathered, acid soils from Fiji. For all soils, changes in the concentration of P in the Leucaena tops followed trends similar to the yield response curve, i.e., the concentration of P was highest at the soil pH at which maximum growth occurred. The concentration of Al in plant tops increased on either side of the pH of maximum growth, but Al uptake by the whole plant (tops plus roots) declined steadily with increasing pH. Although complete major (except P) and minor nutrients were added regularly, there was variation in the uptake of nutrients with pH. Poor growth at low pH values was attributed to an Al-induced P deficiency within the plant and at high pH to a soil P deficiency and, to a smaller extent, to the increased concentration of Al in the plant tops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041364
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  • 6
    Electronic Resource
    Electronic Resource
    Assessment of plant-available phosphate in limed, acid soils using several soil-testing procedures (1991)
    Springer
    Nutrient cycling in agroecosystems 30 (1991), S. 47-53 
    Details
    ISSN: 1573-0867
    Keywords: Soil P test ; plant available P ; P-buffering capacity ; limed acid soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A range of soil-testing procedures was used in a factorial glasshouse study to assess the plant-available phosphate (P) status of soils which had been treated with lime and added P. A close 1:1 relationship (r = 0.90***) was obtained between plant P uptake and resin-extractable soil P. In contrast, Olsen-, Colwell-, Bray (I) and (II)-, and Mehlich-extractable P were only weakly correlated with P uptake. Inclusion of 4 different indices of P-buffer capacity did not improve the relationship between plant P uptake, and extractable P. The difficulty in relating plant P uptake data to extractable-soil P levels is attributed to the problems associated with extracting P from limed soils. There was no useful relationship between plant P uptake and isotopically-exchangeable P in the soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048826
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