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  • soil solution  (2)
  • N partitioning  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Uptake of ammonium and nitrate ions from acid mist applied to Sitka spruce [Picea sitchensis (Bong.) Carr.] grafts over the course of one growing season (1996)
    Springer
    Trees 10 (1996), S. 261-267 
    Details
    ISSN: 1432-2285
    Keywords: Wet N inputs ; Labelled N ; N partitioning ; N accumulation ; Per cent incorporation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Cloned Sitka spruce grafts were subjected to NH4NO3 mist (1 mm day-1 equivalent) acidified with H2SO4, for 4 days a week, from April until November. Three N treatments at pH 5.0 used 0.01 mol m-3 15NH4 15NH3, 1.6 mol m-3 15NH4 NO3 or 1.6 mol m-3 NH4 15NO3. At pH 2.5, the treatments were15NH4 15NO3,15NH4NO3 and NH4 15NO3 all at 1.6 mol m-3. At the end of the growing season,15N was found in every part of the trees, even when NH4NO3 was supplied at 0.01 mol m-3. It was shown that both $$NH_{4^ + } $$ and $$NO_{3^ - } $$ could enter needles to a similar degree and be transported to the roots. No differences between pH treatments or clones could be demonstrated. Entry of labelled N via the roots, in those trees with unprotected compost, was reflected in higher fine root15N content, but no change in shoot15N levels. Per cent incorporation expressed as labelled N as a percentage of total N, was generally at its highest in bark, and in older needles in all treatments, values ranging from 5 to 11%. When15N content was expressed as total content for each tree part on a per tree basis, 25–36% was found in current year needles, with a further 12% in current year bark. The most reproducible data was that for dry weight of tree parts as per cent of the whole tree, where proportions compared closely between treatments and the two clones used. The implications of the results for cuticular transport mechanisms, N storage and internal cycling are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185678
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  • 2
    Electronic Resource
    Electronic Resource
    Inorganic and organic P in soil solutions from three upland soils (1994)
    Springer
    Plant and soil 160 (1994), S. 161-170 
    Details
    ISSN: 1573-5036
    Keywords: Cambisol ; defoliation ; fertilizer ; grass/clover sward ; organic phosphorus ; phosphate ; soil solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of defoliation and NPK fertilizer addition on the amounts of inorganic orthophosphate (Pi), organically combined phosphorus (Po), total phosphorus (Pt) and the residual fraction Pr=Pt−(Po+ Pi) in soil solution from three P-deficient Cambisols with grass/clover swards were determined. The defoliation treatments, carried out in the first year, were regular cutting every 2–4 weeks to 2 cm, and cutting at the end of the growing season. The fertilizer treatments, applied in the second year, were 25 g m-2 of 25:5:5 and 20:10:10 NPK fertilizer. In both years, soil solution was also taken from bare soil plots. Defoliation influenced the concentration of Pi, Po, Pr and Pt in soil solutions, which mostly increased in the order no cut〉cut 2 cm〉bare soil treatment. Fertilizer additions increased dry matter production, and the amount of P in the crop, but had relatively little influence on soil solution concentrations of Pi, Po, Pr and Pt compared with the previous year. There were no significant differences in either dry matter production, P uptake or the Pi, Po, Pr and Pt concentrations of soil solution between the plots receiving 25:5:5 or 20:10:10 fertilizer treatments. Phosphorus in soil solutions from the most acid of the three cropped soils was significantly correlated with Fe during August and October. The linear correlation coefficients (r) between Fe and Pi, Po or Pt were between 0.73 and 0.94.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010142
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  • 3
    Electronic Resource
    Electronic Resource
    Inorganic and organic P in soil solutions from three upland soils (1994)
    Springer
    Plant and soil 159 (1994), S. 255-264 
    Details
    ISSN: 1573-5036
    Keywords: cambisol ; centrifugation ; organic phosphorus ; phosphate ; season ; soil solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil solutions from three P-deficient Cambisols were analyzed for inorganic orthophosphate (Pi), organically combined phosphorus (Po), total phosphorus (Pt) and residual phosphorus (Pr=Pt−(Po+Pi)). The solutions were obtained by centrifugation of soil samples wetted-up to 90% field capacity. Increasing the centrifugal force from 750 to 1400×g (for 60 minutes) increased the volume of soil solution obtained by 17–35%. Increasing the centrifugation period from 30 to 90 minutes (at 1000×g) increased the volume by 2–12%. The effect of the different centrifugation conditions on the P composition of soil solutions were not critical and had little effect on either Pt concentration or on the distribution of P between Pi, Po and Pr fractions. Soil solutions were also obtained on a seasonal basis over a 2-year period. The soils, fresh from the field, were wetted-up to 90% field capacity and centrifuged at 1000×g for 60 minutes to isolate the soil solution. Although the soils were derived from contrasting parent rock, and had different Fe and Al sesquioxide contents, the Pt concentrations of the soil solutions and the distribution between the fractions were similar. Annual average Pt concentrations for the 3 soils ranged from 93 to 114 and 63 to 89 μg dm-3 during the first and second year, respectively. Seasonal changes were of a similar order as those resulting from differences in soil type. During May, June, August and October soil solutions had average Pt concentrations ranging from 82 to 111 and 51 to 119 μg P dm-3 in 1989 and 1990, respectively. Po was a major P component in soil solution and exceeded the amount of Pi by about 5–20 times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009288
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