Effects of SO 2 Exposure with Nitrogen and Sulphur Fertilization on the Growth of Agropyron smithii

Milchunas, Daniel G.; Lauenroth, W. K.; Dodd, J. L.; McNary, T. J.

doi:10.2307/2402496

Cited by 16 publications

(7 citation statements)

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“…In other studies (e.g. Ashenden & Mansfield, 1977;Milchunas et al, 1981) increases in growth (measured as leaf area) were noted, but these may not have represented increases in weight .…”

Section: Number and Weight Of Tillersmentioning

confidence: 85%

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Tillering and Leaf Area of Winter Barley Exposed to Sulphur Dioxide in the Field

1987

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SUMMARYWinter barley {Hordeum vulgare L., cv. 'Igri'), grown as a crop in the field, was exposed to SOj concentrations ranging fronn 40 to 200 ppb [parts per billion (10*) by volume] above ambient. From spring onwards, plants at 40 and 50 ppb were consistently the heaviest, having slightly more tillers than plants in the other plots. In the range 80 to 200 ppb SOg, the plants usually had fewer tillers than the controls, but this difference was not consistent throughout the season. Trends in the numbers and weights of tillers were interpreted as circumstantial evidence that 80 to 200 ppb of SOg may have decreased assimilate production.Leaf area in May was markedly bigger in fumigated plants than in the controls. At 80 to 200 ppb the increases may have resulted from the plants having diverted a greater proportion of shoot dry weight into leaf tissue and from increased specific leaf area. These responses of ' Igri' barley in the field resembled those obtained by other workers for the same variety grown in controlled environments.

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“…In other studies (e.g. Ashenden & Mansfield, 1977;Milchunas et al, 1981) increases in growth (measured as leaf area) were noted, but these may not have represented increases in weight .…”

Section: Number and Weight Of Tillersmentioning

confidence: 85%

“…Nevertheless, in our crops growth was greater in the 40 and 50 ppb plots than in controls, suggesting that with added S the plants were able to make more effective use of the N applied as fertilizer (cf. Milchunas et al, 1981).…”

Section: Number and Weight Of Tillersmentioning

confidence: 99%

Tillering and Leaf Area of Winter Barley Exposed to Sulphur Dioxide in the Field

1987

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“…Comparable increases in dry weight at low SO.^ concentrations do not appear to have been noted in other studies, but in the long-term exposure of ' Igri' done by Pande & Mansfield (1985a) the data show that during May to July the weight of the polluted plants was consistently a little greater than the controls by an average of 1'4%. A stimulation of leaf area growth was reported when Agropyron smithii in Montana natural grassland was exposed to 18, 36 and 80 ppb of SO^ with and without added nitrogen (Milchunas et al, 1981): with N fertilization, leaf area increased as the level of SO.^ increased. However, these workers did not report plant weights, and an increase in leaf area may not have represented a corresponding weight increase: it is well established that in polluted plants leaf area can increase without weight increase through leaves becoming bigger and thinner (Bell et al, 1979;Jones & Mansfield, 1982;Whitmore, Davies & Mansfield, 1985).…”

Section: Discussionmentioning

confidence: 96%

Depression of Growth and Yield in Winter Barley Exposed to Sulphur Dioxide in the Field

et al. 1986

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SUMMARYA field exposure system designed for the controlled release of sulphur dioxide (SO,) was used in two contrasting seasons to expose commercial crops of winter barley {Hordeum vulgare L.) to SO2 concentrations ranging from 40 to 200 ppb [parts per billion (10') by volume] above ambient. During winter and early spring, growth of the plants was depressed at high SOj concentrations but later recovered; in spring and summer, low concentrations stimulated growth above that of controls, but there was no corresponding increase in grain yield. Yield depression is discussed in relation to SOj concentration and dose.

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“…The apparent stimulatory effects of 125 ;xgm~^ of SO2 on E. calophylla may be explained as changes in assimilate partitioning as part of a fertilisation/toxicity-controlled mechanism (MILCHUNAS et al 1981). While 125 /u.g m^^ may stimulate some growth parameters, 261 /xg m~^ is toxic.…”

Section: Discussionmentioning

confidence: 99%

“…Although not directly comparable, the foliar concentrations of sulfur in the control plants were similar to typical foliar sulfur concentrations in mature E. ealophylla, E. marginata Donn ex Smith and other Eucalyptus species in healthy native forests, that is in the range 0.08-0.12 % (HINGSTON et al 1979;HINGSTON et al 1981;GROVE and MALAJCZUK 1985;TURNER and LAMBERT 1979). In addition, MILCHUNAS et al (1981), MURRAY (1985), WHITMORE (1985) and BAKER et al (1986) have reported growth stimulation in plants unlikely to have been sulfur-deficient before exposure to relatively low concentrations of SO2.…”

Section: Discussionmentioning

confidence: 99%

Sulfur dioxide‐induced growth changes in Eucalyptus calophylla

Murray

Wilson

1989

European Journal of Forest Pathology

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Eucalyptus calophylla Lindley exposed to two levels of sulfur dioxide continuously for 120 days in open top chambers, showed contrasting changes in resource partitioning. Exposure to 125 μg m−3 of SO2 had an apparent fertilization effect with increase in the weight of stems and total above ground plant weight whereas 261 μg m−3 had a toxic effect with a reduction in the total number of leaves. SO2 had no effect on leaf protein or chlorophyll concentration nor on visible injury.

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Effects of SO 2 Exposure with Nitrogen and Sulphur Fertilization on the Growth of Agropyron smithii

Cited by 16 publications

References 0 publications

Tillering and Leaf Area of Winter Barley Exposed to Sulphur Dioxide in the Field

Tillering and Leaf Area of Winter Barley Exposed to Sulphur Dioxide in the Field

Depression of Growth and Yield in Winter Barley Exposed to Sulphur Dioxide in the Field

Sulfur dioxide‐induced growth changes in Eucalyptus calophylla

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