Phosphate absorption by white clover stolons in pasture

Hay, M. J. M.; Dunlop, James

doi:10.1080/00288233.1982.10420914

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…Previous studies (Wilkinson & Gross 1967;Hay & Dunlop 1982; R. H. Jackman unpublished data) have shown similar P contents in stolon and leaf material of white clover and this was also found in white clover of the SSS treatment. However, the big differences in P content among leaf, surface stolon, and buried stolon of white clover of the RGC treatment indicates there is variability within white clover in the pattern of P content amongst parts of the shoot system.…”

Section: Discussionsupporting

confidence: 51%

“…The lower N content of stolon compared with that of leaf (Fig. I) agrees with previous reports (Cowling 1961;Hay & Dunlop 1982). However, Cowling (1961) measured a slightly higher value of2.56-2.96% N in total stolon from a pure white clover sward in England, in August, and Hay & Dunlop (1982) found a slightly lower value of 2.10% in surface stolon from a grazed pasture in April, than the corresponding measurements obtained in this study (Fig.…”

Section: Discussioncontrasting

confidence: 48%

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Effect of grazing management and season on nitrogen and phosphorus content of leaves and stolons of white clover in mixed swards

Hay¹,

Nes²,

Robertson³

1985

New Zealand Journal of Experimental Agriculture

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To cite this article: M. J. M. Hay , P. Nes & M. R. Robertson (1985) Effect of grazing management and season on nitrogen and phosphorus content of leaves and stolons of white clover in mixed swards, New Zealand Journal of Experimental Agriculture, 13:3, 209-214, DOI: 10.1080/03015521.1985 The nitrogen (N) and phosphorus (P) contents of leaf, surface stolon, and buried stolon of white clover (Trifolium repens L.) were measured in samples taken every 2 months, from pasture under rotational grazing by cattle (RGC) and set stocking by sheep (SSS), for 3 years. The effect of the system of grazing management of sheep on Nand P content of 3 herbage classes of white clover was examined during a I-year period by analysing samples taken monthly from pastures with 3 different management backgrounds; set stocked (SS), rotationally grazed (RS) or set stocked from lambing to drafting, then rotationally grazed for the rest of the year (CS). In the 3-year study, the content of N did not differ between the RGC and SSS treatments but the mean values of 4.59% in leaf, 2.75% in surface stolon, and 2.22% in buried stolon all differed. However, P contents differed between treatments: with RGC treatment, mean P levels decreased (0.43, 0.29, and 0.23% for leaf, surface stolon, and buried stolon respectively) whereas, with SSS treatment, contents in each of the respective herbage classes were higher and differences among the herbage classes were much smaller, the only significant difference occurring with buried stolon (0.51,0.51, and 0.47% for leaf, surface stolon, and buried stolon respectively). The system of sheep grazing management affected both Nand P contents in the same manner, with contents decreasing in the order SS > CS > RS. Again, there was a marked decrease in mean N content of the herbage classes in the order leaf (4.35%), surface stolon (2.97%), and buried stolon (2.11%), whereas the mean P contents of the herbage classes differed Received 21 March 1985. revision 10 May 1985 much less, with buried stolon (0.43%) being lower than leaf and surface stolon (both 0.51%). Seasonal variation in both Nand P content of each of the herbage classes in both studies followed the same trend -higher values during the moist, cooler part of the year (May-September) and lower values during the drier, warmer period (January-March).

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Section: Discussionsupporting

confidence: 51%

Section: Discussioncontrasting

confidence: 48%

Effect of grazing management and season on nitrogen and phosphorus content of leaves and stolons of white clover in mixed swards

Hay¹,

Nes²,

Robertson³

1985

New Zealand Journal of Experimental Agriculture

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“…Despite extensive investigations, the physiology of the uptake of substances through the cuticle is little understood (Martin & Juniper 1970). Hay & Dunlop (1982) found considerable variation from stolon to stolon in the amount of phosphate absorbed especially at the lowest phosphate concentration supplied (10 I-LM). An examination of the anatomy and development of the superficial layers of white clover stolons was undertaken in an effort to clarify reasons for the large variation in phosphate uptake previously observed.…”

Section: Introductionmentioning

confidence: 99%

“…The 15 stolons of white clover examined in this study were from an established pasture of 'Grasslands Huia' white c1over-'Grasslands Ruanui' rye grass previously described by Hay & Dunlop (1982).…”

Section: Plant Materialsmentioning

confidence: 99%

“…Stolons of white clover can absorb phosphate when it is available at the surface of the internode (Hay & Dunlop 1982). The pathway for this absorption is not known as the shoots of plants are generally Covered with a cuticle which is deemed to limit the movement of water and its solutes, however, any movement that does occur is through the cuticle rather than through stomata (Martin & Juniper 1970).…”

Section: Introductionmentioning

confidence: 99%

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Anatomy and development of the superficial layers in stolons of white clover (Trifolium repensL.)

Hay¹,

Dunlop²,

Hopcroft³

1982

New Zealand Journal of Botany

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Scanning and transmISSIOn electron microscopy, together with bright field and fluorescence microscopy, were used to examine the cuticle, epidermis, hypodermis, and cork cambium (phellogen) of white clover (Trifolium repens L.) stolons during growth and maturation. Development of the hypodermis included the deposition of a suberin lamella in the cell walls. No suberin was deposited in the cell walls of the epidermis. The cork cambium was formed in the third to fifth internodes basipetal to the stolon apex, and produced layers of suberised cork cells (phellem) when internodes were 11 to 14 basipetal to the apex. Breakdown of the cuticle began at a very early stage. Bacteria were seen to colonise the cuticle and apparently lyse the cuticle and epidermal cell walls and penetrate eventually into the hypodermis. The suberin lamella appeared to be more resistant to bacterial attack than the cellulose portion of the cell wall. It was concluded that variation in the degree of breakdown of the cuticle was probably responsible for the large variation in phosphate absorption of stolon internodes previously observed.

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The responses of two genotypes of white clover to addition of lime to an acid permanent grassland soil

Jarvis

1984

J Sci Food Agric

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The response of white clover to addition of lime was studied in pots with an acid permanent grassland soil (pH 4.1), and a comparison made between a commercial cultivar (Blanca) and a white clover indigenous to the acid soil. The yield of both plants increased markedly with addition of lime, but the native genotype reached maximum yield at a lower pH. In both cases, however, only relatively small adjustments of pH were required to produce considerable increases in yield. The addition of lime reduced the amounts of A1 and Mn extracted by lhi ammonium acetate and 0 . 0 1~ CaC12, and increased exchangeable Ca. It was suggested that, although plant contents of Mn were high and those of Ca low, the effect of lime was not on the clover plant per se but on nodulation and the supply of N through symbiotic fixation. When no lime was added, both plants contained concentrations of N below that suggested as critical, and had only limited numbers of nodules on their roots. Excess A1 and/or Mn, or insufficient Ca may have been responsible for inhibition of nodulation at the low pH of the unlimed soil. Although the indigenous plant also grew poorly when no lime was added, it displayed a number of characteristics which may assist its performance and persistence under acid conditions in the field.

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Phosphate absorption by white clover stolons in pasture

Cited by 10 publications

References 17 publications

Effect of grazing management and season on nitrogen and phosphorus content of leaves and stolons of white clover in mixed swards

Effect of grazing management and season on nitrogen and phosphorus content of leaves and stolons of white clover in mixed swards

Anatomy and development of the superficial layers in stolons of white clover (Trifolium repensL.)

The responses of two genotypes of white clover to addition of lime to an acid permanent grassland soil

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