Automated distillation procedure for the determination of nitrogen

Keay, John; Menagé, P. M. A.

doi:10.1039/an9699400895

Cited by 63 publications

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“…Nitrogen (N) and phosphorus (P) were analysed using the kjeldahl method, with copper sulphate (CuS0 4 ) and selenium (Se) as a catalyst (McKenzie & Wallace 1954). Both were determined in an autoanalyser, P by a modified molybdate-vandate complex method (Kitsen & Mellon 1944) and N by the alkaline phenate method (Keay & Menage 1969).…”

Section: Methodsmentioning

confidence: 99%

Ecotypic differentiation in the ultramafic flora of the South Island, New Zealand

Lee

Mark

Wilson

1983

New Zealand Journal of Botany

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Fifteen species were investigated for ultramafic tolerance. Seven showed evidence of ecotypes including 4 indigenous species (Luzula crinita var. petriana, Poa colensoi, Neopaxia australasica, and Cotula pyrethrifolia) and 3 widely naturalised grasses (Agrostis tenuis, Anthoxanthum odoratum, and Lolium perenne). Plants from ultramafic populations achieved higher shoot calcium concentrations on ultramafic soil and John Innes Potting Compost, and maintained lower shoot/root ratios on ultramafic soil than plants from non-ultramafic populations. High residual nickel concentrations in shoots of ultramafic clones grown for up to 15 months on non-ultramafic soil suggest that for some species, a preconditioning period longer than the normal 6--8 weeks is required. No evidence of edaphic ecotypes was found in the woody species Nothofagus solandri var. cliffor-(ioides, Griselinia littoralis, or Leprospermum scoparium.

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Section: Methodsmentioning

confidence: 99%

Ecotypic differentiation in the ultramafic flora of the South Island, New Zealand

Lee

Mark

Wilson

1983

New Zealand Journal of Botany

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“…In Experiment 3 an automatic analyzer was used, with the methods based on those of Keay & Menage (1969), John (1970) and Brookes & Powlson (1981). The equivalence of the methods was checked by analyzing some samples by both methods.…”

Section: Plant Materials and Conditions For Plant Growthmentioning

confidence: 99%

EFFECTS OF MYCORRHIZAL INFECTION ON PLANT GROWTH, NITROGEN AND PHOSPHORUS NUTRITION IN GLASSHOUSE‐GROWN ALLIUM CEPAL.

et al. 1986

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SUMMARYGrowth and rates of uptake of nitrogen and phosphorus (inflow) in Allium cepa L. were measured in three experiments. EfTects of mycorrhizal infection {Glomus mosseae (Nicol. and Gerd.) Gerdemann and Trappe) and N and P fertilization were investigated. The experiments were carried out in a naturally-lit glasshouse, so that seasonal variations in solar radiation infiuenced experimental results.In all experiments, a large positive growth response to mycorrhizal infection was observed when soil P was low. However, at high soil P smaller growth responses to infection were observed, as expected. Infection was associated with increased inflow of P, at all levels of soil P, even when non-mycorrhizal plants grew as well as or better than mycorrhizal plants. Lower P inflow was observed when infection was low and also at low irradiance in hoth mycorrhizal and non-mycorrhizal plants. The results show that mycorrhizal fungi increase the rate at which P is absorbed from soil, even under conditions which precluded a positive growth response to infection.In plants grown in spring and summer (two experiments), mycorrhizal infection was also associated with increased N inflow. N inflows in both mycorrhizal and non-mycorrhizal plants were lower in a third experiment in late winter and mycorrhizal infection had little or no effect on N inflow in this experiment. Increased N supply increased the inflow of N, concentrations of N in plant tissues and plant growth except in plants that were severely P limited, and there was no evidence that mycorrhizal infection alleviated N stress in low N plants.The results are discussed in relation to the environmental factors limiting plant growth, in particular nutrient uptake via and carbohydrate use by the fungal symbiont.

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“…The remainder of the sample was similarly dried. Chemical analyses of foliar samples Concentrations of elements were determined using x-ray fluoresc~ce spectrometry (Norrish & HuRon 1977; apart from nitrogen, which was measured using the digestion procedure ofMcKenzie & Wallace (1954) and the autoanalytical technique of Keay & Menage (1969).…”

Section: Methodsmentioning

confidence: 99%

Growth ofPinus radiatain relation to foliar element concentrations on ultramafic soil, New Zealand

Lee

Littlejohn

Prema³

1991

New Zealand Journal of Botany

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Nine-year-old Pinus radiata in a plantation on ultramafic soil at Black Ridge, Southland, vary greatly in size. Four measures of growth (Iree height, basal diameter, and dwarf shoot size and weight) were recorded in 50 plants, together with concentrations of 18 elements in current-year foliage. Correlation coefficients and multiple regression of element concentrations against tree height indicated that phosphorus, potassium, copper, and nitrogen were the main elements influencing Pinus radiata growth on this soil.

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Automated distillation procedure for the determination of nitrogen

Cited by 63 publications

References 0 publications

Ecotypic differentiation in the ultramafic flora of the South Island, New Zealand

Ecotypic differentiation in the ultramafic flora of the South Island, New Zealand

EFFECTS OF MYCORRHIZAL INFECTION ON PLANT GROWTH, NITROGEN AND PHOSPHORUS NUTRITION IN GLASSHOUSE‐GROWN ALLIUM CEPAL.

Growth ofPinus radiatain relation to foliar element concentrations on ultramafic soil, New Zealand

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