Analysis of the response of pasture legumes to phosphorus in a controlled environment

Hart, A. L.; Halligan, Gerald Harnett; Haslemore, R. M.

doi:10.1080/00288233.1981.10420890

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…The slight rise in P concentration of youngest mature leaves and the absence of a rise with P supply in total P concentration of sets of adjacent leaves is consistent with other observations indicating a relatively small increase in P concentration with increases in P supply in lotus (Davis 1981b, c;Hart et al 1981a).…”

Section: Discussionsupporting

confidence: 79%

Phosphorus fractions in trifoliate leaves of white clover and lotus at various levels of phosphorus supply

Hart¹,

Jessop²

1983

New Zealand Journal of Agricultural Research

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The concentrations of total P, inorganic (Pi), lipid, and ester P were measured in the youngest mature trifoliate leaves of white clover and lotus plants grown at various levels of P supply, In white clover, the Pi concentration rose as the P supply increased, even though there was no dry matter response by the shoots at the highest levels of P, In contrast, the shoot dry weight of lotus, which was generally higher than that of white clover, continued to increase over the whole range of P supply, and the Pi concentration remained unchanged, The concentration of lipid and ester P in both species increased only slightly with P supply, The concentration of total P declined markedly with trifoliate leaf age in lotus, The concentration of Pi, lipid P, and ester P also declined but less so, The P content and dry weight of basal leaflets of lotus leaves was about 25 % of that of the trifoliate leaves, White clover is typical of plants from fertile sites, Its growth responds markedly to increase in P supply, excess Pi being stored in vacuoles, Lotus can grow well at both high and low P supply, and P concentrations in the shoots are maintained at relatively low levels, This behaviour is in contrast to that of other plants adapted to low soil fertility,

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Section: Discussionsupporting

confidence: 79%

Phosphorus fractions in trifoliate leaves of white clover and lotus at various levels of phosphorus supply

Hart¹,

Jessop²

1983

New Zealand Journal of Agricultural Research

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“…There is potential to decrease P losses to surface runoff if plant species are chosen that avoid excessive P concentrations in foliage. Work of Hart et al (1981) indicates that among legumes grown at a similar soil test P concentration, white clover stores greater quantities of P in foliage. Further decreases in P losses, and savings in P fertiliser, could be achieved if this species reaches the near maximum yield at low soil test P concentrations.…”

Section: Management Considerationsmentioning

confidence: 98%

Phosphorus in pasture plants: potential implications for phosphorus loss in surface runoff

McDowell

Sharpley²,

Crush

et al. 2010

Plant Soil

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Phosphorus (P) loss from land can impair surface water quality. Losses can occur from soil and plant components. While it is known that P losses increase with soil P concentration, it is not known how losses from pasture plants vary with soil P concentration or between different forages. We examined total P and filterable reactive P (FRP) in water extracts of plant shoots, used as a measure of potential P loss to surface runoff, in different forage species relative to soil P concentration in field trials and a glasshouse experiment. The mean total P concentration of 16 forage species in grazed field plots was greater (P<0.01; LSD 05 =117 mg kg −1 ) in legumes (3,480 mg kg −1 ) than for grasses (3,210 mg kg −1 ). Total plant P concentrations of grasses and legumes increased with soil Mehlich-3 P concentrations in both glasshouse and field trials with concentrations close to 6,000 mg kg −1 in arrowleaf clover at 680 mg kg −1 Mehlich-3 soil P. FRP in water extracts of plant shoots increased relative to plant total P as soil Mehlich-3 P increased, with the greatest concentrations shown by crimson clover and arrowleaf clover. Analysis of water extracts of ryegrass and clover herbage from a field trial showed that while FRP was increasing, phytase-available-P decreased significantly from about 70% of filterable unreactive P at the lowest Mehlich-3 P concentrations, to close to zero at 200 mg kg −1 Mehlich-3 P. The wide variation, and enrichment of FRP in water extracts and total P with increasing Mehlich-3 P among species, indicates that cultivar and site selection and sward management provide a potential option to mitigate P loss to surface waters.

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“…Shoot N concentrations of white clover gradually decrease with increasing levels of P supply (Caradus et al, 1993). Hart et al (1981) concluded that growth of white clover plants reliant on N from biological N2 fixation was limited by N at high levels of P supply. They found that root/shoot ratio of white clover remained constant after 80% maximum yield was reached.…”

Section: Effect Of Phosphorus Levelmentioning

confidence: 98%

Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

Caradus

Mackay

Dunlop

et al. 1995

Journal of Plant Nutrition

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Root dry weight and the relationship between shoot and root characteristics for 119 white clover (Trifolium repens L.) cultivars and breeding lines were examined at five (40, 120, 200, 400, and 500 mg P/kg soil) phosphorus (P) levels. There were significant (P<0.01) differences among cultivars for root dry weight and root/shoot ratio. Instantaneous root/shoot ratio decreased with increasing P supply up to 200 mg P/kg, and then increased again from 400 to 500 mg P/kg soil. Allometric analysis indicated that root growth relative to shoot growth increased with increasing P supply. There was a significant (P<0.01) cultivar x P level interaction such that for the cultivars, the root/shoot ratio was either unaffected, increasing, or decreasing with increasing level of P supply. However, root/shoot ratio appeared to be unrelated to the functions used to describe the P response of the 119 cultivars studied. Shoot characters such as dry weight, leaf number, and stolon length were most closely correlated with root dry weight at the moderately low P levels of 120 and 200 mg added P/kg, where average P response was 9 and 24% of yields at 500 mg P/kg soil, respectively, rather than at the higher P levels. Root/shoot ratio was significantly correlated (r>0.6) with root dry weight over all P levels but not with any of the measured shoot characters (-0.2> r <0.3).

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Analysis of the response of pasture legumes to phosphorus in a controlled environment

Cited by 10 publications

References 19 publications

Phosphorus fractions in trifoliate leaves of white clover and lotus at various levels of phosphorus supply

Phosphorus fractions in trifoliate leaves of white clover and lotus at various levels of phosphorus supply

Phosphorus in pasture plants: potential implications for phosphorus loss in surface runoff

Relationships between shoot and root characteristics of white clover cultivars differing in response to phosphorus

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