Evaluation of sulphur status of East Coast pastures of the North Island, New Zealand 1. Soil and herbage survey

Nguyen, M. L.; Tillman, R. W.; Gregg, P. E. H.

doi:10.1080/00288233.1989.10423461

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…The low amounts of adsorbed soil S «5 ug S/g) obtained in this study suggest that the Lismore stony silt loam with a low Pretention «35%) (Saunders & Hogg 1971) has a low capacity to adsorb S04-S (Metson 1979;Nguyen et al 1989b). Sulphate leaching is therefore likely to be significant in this soil with a low SO4-S retention capacity (Sinclair & Saunders 1984), especially when superphosphate is applied at a rate which provides excess S for pasture S requirements (Gregg & Goh 1979).…”

Section: 75·mentioning

confidence: 91%

Accumulation of soil sulphur fractions in grazed pastures receiving long-term superphosphate applications

Nguyen

Goh

1990

New Zealand Journal of Agricultural Research

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Topsoil samples (0--75mm) collected at the beginning ofeach growing season over a 35-year period from grazed pastures receiving annual superphosphate applications at rates of 0, 188, and 376 kg/ha per year were analysed for changes in soil organic nitrogen (N), total carbon (C), organic sulphur (So), hydriodic acid-reducible S (HI-reducible S), carbon-bonded S (C-bonded S), and readily-soluble plus adsorbed S. In addition, soils from subsoil depths (75-300 mm) were also sampled at the beginning of each growing season for 3 years to investigate the effects of superphosphateapplications on So, readily-soluble plus adsorbed S, microbial S, and arylsulphatase activity. Results obtained showed that over 95% of soil S was in So and the remainder was in readily-soluble plus adsorbed S. Applications of superphosphate to increase S fertiliser inputs from 0 toeither21 or42 kg S/ha per year, substantially enhanced the accumulation of So, HI-reducible S, and C-bonded S fractions. However, there was no further increase in these So fractions by increasing annual S inputs from 21 t042kg S/ha. Approximately 50% of this additional S was considered to be leached from the top 300 mm of the soil, which has a low capacity to adsorb S. The accumulation of So reached an apparent steady state after 25-27 years of superphosphate applications, whereas N and C attained a steady state at 3-4 and 9-12 years earlier respectively, thus suggesting that these elements were stabilised independently in soil organic matter. Both C-bonded S and HI-reducible S were the major So fractions constituting 50--60% and 40--50%, respectively. The proportion of So as C-bonded S decreased with depth, whereas the reverse occurred with HI-reducible S. The arylsulphatase activity reflected the previous topdressing history and decreased with depth. In contrast, microbial S was not affected by superphosphate applications and showed inconsistent trends with depth. It accounted for less than 3% of total soil S in all treatments.

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Section: 75·mentioning

confidence: 91%

Accumulation of soil sulphur fractions in grazed pastures receiving long-term superphosphate applications

Nguyen

Goh

1990

New Zealand Journal of Agricultural Research

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“…Plant samples were analysed for their total S content by X-ray fluorescence spectrometry (Norrish & Hutton, 1977). Soil pH was measured in 0.01 M calcium chloride and loss on ignition (LOI) determined after ashing at 700 C for 3 hours.…”

Section: Plant and Soil Analysismentioning

confidence: 99%

“…1). Approximately two -thirds of the samples contained less than 13 mg S g 71 , regarded as the minimum acceptable concentration for plant growth (Scott & Munro, 1979;Nguyen et al, 1989). A quarter of the soils had a very low to low status according to soils advisory categories in which the upper concentrations for very low, low, medium, and high categories are 4, 10, 14, 30 mg S g 71 soil, respectively.…”

Section: Extractable Soil Sulphur and Herbage Smentioning

confidence: 99%

Soil S availability in upland pastures of NE Scotland: relationship of extractable soil S and soil respiration to soil and site characteristics

Donald¹,

Chapman²,

Edwards³

et al. 1999

Soil Use and Management

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Abstract. The mean extractable sulphur (S) concentration in 315 upland topsoil samples collected in 1988/89 from beneath pasture in NE Scotland was 13 μg S g−1 (range 2–77 μg S g−1). More than two thirds of the samples had S concentrations less than that acceptable for productive soils. Continued decreases in atmospheric S inputs may have increased this proportion subsequently. The analysis of herbage S also indicated that two‐thirds of the samples were below 0.2% S. A ‘respirometric index’, namely CO2 produced during cellulose decomposition without added S as a percentage of that produced with added S, was significantly less than 100% in a quarter of the soils. Results of three different extraction procedures suggested that sulphate in the soils was present mainly as free plus adsorbed rather than precipitated forms. Soil extraction identified a significant non‐sulphate S fraction, presumably organic S. The variability in extractable S stemmed from a combination of geographical, depositional and local site and soil factors. Extractable S was significantly correlated with soil organic matter content and inversely with soil pH and together these factors explained 37% of the variability. While significant differences in mean concentrations between geographical area, soil association and drainage status were evident, no trends could be observed between the major soil subgroups or with altitude.

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“…They were then frozen at _5°C until chemical analyses were conducted, using the methods described by Nguyen et al (1989). Oven-dried (60°C for 48 h) grass and clover samples were finely ground and analysed for total N, total S, and sulphate (Nguyen et al 1989). …”

Section: Chemical Analysesmentioning

confidence: 99%

“…Part 1 of this study (Nguyen et al 1989) reported on a survey of soil and herbage levels in a region of ~e ~ast Coa~t of the North Island. This survey IdentIfied a WIde range of S levels in both soils and her~age.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sulphur status of East Coast pastures of the North Island, New Zealand 2. Field trials

Nguyen

Tillman

Gregg

1989

New Zealand Journal of Agricultural Research

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Significant yield responses to spring application of sulphur (S) as a mixture of gypsum and elemental S were recorded at three of five trials conducted in the East Coast region of the North Island. The S-responsive sites included one where there had been no recent application of superphosphate and two which had received regular autumn applications of 25-33 kg S/ha per year as superphosphate. These spring S responses suggest that substantial amounts of sulphate from superphosphate applied in the autumn can be leached during the winter months. Spring application of Sfree nitrogen (N) fertiliser did not aggravate the effectofS deficiency on pasture growth atS-deficient sites. However, this spring fertilisation ofN caused an increase in the N:S ratios in mixed herbage with values ranging from 18: 1 to 23: 1 at two S-deficient sites.

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Evaluation of sulphur status of East Coast pastures of the North Island, New Zealand 1. Soil and herbage survey

Cited by 5 publications

References 20 publications

Accumulation of soil sulphur fractions in grazed pastures receiving long-term superphosphate applications

Accumulation of soil sulphur fractions in grazed pastures receiving long-term superphosphate applications

Soil S availability in upland pastures of NE Scotland: relationship of extractable soil S and soil respiration to soil and site characteristics

Evaluation of sulphur status of East Coast pastures of the North Island, New Zealand 2. Field trials

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