Field studies on the fate of radioactive sulphur fertilizer applied to pastures

Goh, K. M.; Gregg, P. E. H.

doi:10.1007/bf01048938

Cited by 24 publications

(14 citation statements)

References 12 publications

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“…These trends were similar to those already described for soil S ( Table 1), suggesting that sulphate in superphosphate might have been lost by leaching (Toxopeus 1970) or incorporated into the soil organic pool (Goh & Gregg 1982;Freney 1986). …”

Section: Herbage Sulphursupporting

confidence: 74%

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

Nguyen

Tillman

Gregg

1989

New Zealand Journal of Agricultural Research

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Two sampling surveys for soil and herbage, the first in autumn and the second in the following spring, were carried out in the East Coast area of the North Island to investigate the relationship between levels of soil and herbage sulphur (S). Levels of phosphate-extractable soil S generally decreased with depth down the profile to 30 cm and the majority of this soil S was also extracted by 0.01 M CaCl z indicating that adsorbed S is not a major component of phosphate-extractable S in the soils examined. The amounts of adsorbed S were related to the phosphate retention capacity, although there was little accumulation of sulphate in soils with phosphate retention capacities of less than 70%. Total S levels and N:S ratios in herbage were related to levels of phosphate-extractable soil S, with 13 Jlg S/g of soil appearing to be the critical value. Above this value, all herbage samples appeared to have adequate S status. Below this value, there was a wide range in herbage S status from adequate to deficient.

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Section: Herbage Sulphursupporting

confidence: 74%

“…The absence of any evidence of accumulation of sulphate at depth, however, means that organic immobilisation of S in the topsoil (Goh & Gregg 1982) cannot be excluded as a reason for the decrease in phosphate-extractable S.…”

mentioning

confidence: 99%

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

Nguyen

Tillman

Gregg

1989

New Zealand Journal of Agricultural Research

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“…This may be a result of sulphate immobilisation into soil organic matter (Freneyetal.1975;Goh & Gregg 1982) and leaching losses beyond the soil sampling depth of 7.5 cm (Gregg & Goh 1979), caused by irrigation water and rainfall. Using a pasture development index, which takesintoaccountthenumberofyearsunderryegrassclover pastures and the average stocking rate over this period (Sinclair & Saunders 1984), the low soil sulphate in late winter suggests that sulphatecontaining fertilisers would be required in the following spring for all treatments.…”

Section: Discussionmentioning

confidence: 99%

“…The accumulation of soil P and S reserves in grazed pastures has also been reported in other studies in New Zealand (Walker et al 1959;Jackman 1964) and Australia (Barrow 1969;Simpson et al 1974;McLachlan & De Marco 1975;Lewis et al 1987a,b). This accumulation may occur through the immobilisation of applied P and S in soil (Cosgrove 1977;Goh & Gregg 1982), adsorption-precipitation of phosphate on soil colloids (Barrow 1980), and the returns of these elements through plant litter or animal excreta (Ti1l1975; Gillingham et al 1980).…”

Section: Discussionmentioning

confidence: 99%

Pasture production and changes in phosphorus and sulphur status in irrigated pastures receiving long-term applications of superphosphate fertiliser

Nguyen¹,

Rickard²,

McBride³

1989

New Zealand Journal of Agricultural Research

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A grazing experiment on aLismore stony silt loam in mid Canterbury spanning a 34-year period has demonstrated the importance of both phosphorus (P) and sulphur (S) fertilisers for the development and maintenance of irrigated ryegrassclover pastures, especially during spring and summer growth periods. In the initial stage of pasture development, the absence of P or S fertiliser inputs can lead to a severe reduction in pasture production and a deterioration of the pasture sward towards weeds and weed grasses at the expense of high quality ryegrass and clover species. Superphosphate applied at rates of 21-24 kg/ha per year is sufficient to satisfy phosphate maintenance requirements for irrigated pastures. However, the S content in superphosphate applied at these rates exceeds pasture S requirements. Spring application of sulphatecontaining phosphatic fertilisers which aims to provide P at a maintenance rate of21-24 kg P/ha per year is also sufficient for pasture S requirements if these fertilisers have a ratio of StoP content of about 0.8: 1. A short-term application of superphosphate for 6 years even at rates well above the maintenance P and S requirements was unable to safeguard pastures against yield reduction or pasture deterioration towards weeds and weed grasses even in the first growing season after superphosphate was Received 18 October 1988; accepted 10 February 1989 discontinued. Superphosphate applications over several years, however, can build up soil P and S reserves which may contribute significantly to plants. Under this situation, the residual value of previous applications may be able to maintain pasture production and high quality herbage species without any reduction for a longer period than that observed under short-term applications. Since soil organic S as well as organic and inorganic P can accumulate under grazed pastures, especially after prolonged annual applications of superphosphate, the contribution of these reserves to pastures should be considered in conjunction with soil phosphate and sulphate tests when assessing pasture requirements for these two nutrients.

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“…Blair et al (1994) found a mean recovery of 28.1% of the applied 35 S into the soil organic S-pools in their pot experiment. Goh and Gregg (1982) also showed that the fertilizer S could be rapidly converted into organic forms and found that 17-40% of the applied 35 S to be in the organic form within 34 to 75 d of fertilizer application. A small amount of applied 35 S might also be adsorbed by the clay and organic matter colloids, but this adsorption should be very low in the present study, as indicated by the soil characteristics data.…”

Section: Banerjee and Yesmin -Partitioning Of 35 S In Rygrass 63mentioning

confidence: 99%

Partitioning of ³⁵S in ryegrass grown in sulfur-deficient soils

Banerjee¹,

Yesmin²

2001

Can. J. Plant Sci.

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A pot study was conducted in a growth chamber using 35 S labelled gypsum to study the fate of applied 35 S fertilizer in a soil-plant system. The distribution among plant parts and soil fraction of applied 35 S was investigated with ryegrass grown in sulfur-deficient soils. Of the applied 35 S, 19-35% was recovered in the shoot and 4-16% in root tissues. Within the soil, extractable 35 S accounted for 41-55% of applied S, microbial biomass 35 S accounted for 2-6%, and the remaining 4-14% was unrecoverable. In addition to the available soil S fraction, it was concluded that S in the unharvested plant residue could be an important supplementary S source for succeeding crops. 35 S extractible correspondait à 41 à 55 % du S de fumure, 2 à 6 % se retrouvait dans la biomasse microbienne et les 4-14 % restants étaient irrécupérables. En plus de la fraction assimilable du soufre présente dans le sol, le S contenu dans les restes de culture non récoltés pourrait constituer une importante source complémentaire de S pour les cultures subséquentes.

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Field studies on the fate of radioactive sulphur fertilizer applied to pastures

Cited by 24 publications

References 12 publications

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

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

Pasture production and changes in phosphorus and sulphur status in irrigated pastures receiving long-term applications of superphosphate fertiliser

Partitioning of ³⁵S in ryegrass grown in sulfur-deficient soils

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Field studies on the fate of radioactive sulphur fertilizer applied to pastures

Cited by 24 publications

References 12 publications

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

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

Pasture production and changes in phosphorus and sulphur status in irrigated pastures receiving long-term applications of superphosphate fertiliser

Partitioning of 35S in ryegrass grown in sulfur-deficient soils

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Partitioning of ³⁵S in ryegrass grown in sulfur-deficient soils