PLANT INDICATORSPasture compositi<strong>on</strong> Assess the botanical compositi<strong>on</strong> of the pasture (the proporti<strong>on</strong> ofeach species present) in the winter or early spring.PASTURE SPECIES vary in their <strong>to</strong>lerance <strong>to</strong> poor soil aerati<strong>on</strong>,waterlogging <str<strong>on</strong>g>and</str<strong>on</strong>g> pugging. C<strong>on</strong>sequently, their nitrogen uptake, drymatter producti<strong>on</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g> survival ability also vary markedly. Phalarisaquatica, tall fescue, meadow fescue, meadow foxtail, Poa trivialis,timothy, creeping bent, sweet grass, pennyroyal, buttercup, duckweed<str<strong>on</strong>g>and</str<strong>on</strong>g> dock are <strong>to</strong>lerant of waterlogging due <strong>to</strong> pugging or poor drainage.Perennial ryegrass, white clover, chewing fescue, brown<strong>to</strong>p, Poa annua,<str<strong>on</strong>g>and</str<strong>on</strong>g> crested dogstail are moderately <strong>to</strong>lerant of waterlogging. Matuaprairie grass, cocksfoot, sweet vernal, Poa pratensis, ratstail, meadowrice grass <str<strong>on</strong>g>and</str<strong>on</strong>g> yarrow are sensitive <strong>to</strong> waterlogging <str<strong>on</strong>g>and</str<strong>on</strong>g> will die out ifwet c<strong>on</strong>diti<strong>on</strong>s persist.Pasture compositi<strong>on</strong> will also change according <strong>to</strong> the degree of treadingdamage. Ryegrass <str<strong>on</strong>g>and</str<strong>on</strong>g> Poa pratensis resist treading damage betterthan many other species, <str<strong>on</strong>g>and</str<strong>on</strong>g> often become more comm<strong>on</strong> in puggedpastures. Poa trivialis, brown <strong>to</strong>p, white clover <str<strong>on</strong>g>and</str<strong>on</strong>g> timothy aremoderately <strong>to</strong>lerant <strong>to</strong> treading. Cocksfoot, red clover <str<strong>on</strong>g>and</str<strong>on</strong>g> yorkshirefog, <str<strong>on</strong>g>and</str<strong>on</strong>g> many low fertility pasture species such as sweet vernal <str<strong>on</strong>g>and</str<strong>on</strong>g>chewing fescue are sensitive <strong>to</strong> intensive treading <str<strong>on</strong>g>and</str<strong>on</strong>g> disappear underprol<strong>on</strong>ged pugging. Treading damage <str<strong>on</strong>g>and</str<strong>on</strong>g> the exposing of bare groundwill also allow invasi<strong>on</strong> by opportunist species such as white clover <str<strong>on</strong>g>and</str<strong>on</strong>g>Poa annua, more vigorous weeds, <str<strong>on</strong>g>and</str<strong>on</strong>g> less desirable pasture species.White clover, being s<strong>to</strong>l<strong>on</strong>iferous, can rapidly col<strong>on</strong>ise bare ground <str<strong>on</strong>g>and</str<strong>on</strong>g>become dominant in severely pugged pasture.70 VISUAL SOIL ASSESSMENT: Volume 1
FIGURE 7: Visual scoring (VS) of pasture compositi<strong>on</strong>POOR CONDITION VS = 0Pastures are often dominated by species thatare more <strong>to</strong>lerant of poor aerati<strong>on</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g>waterlogging due <strong>to</strong> pugging, by species suchas ryegrass that are more <strong>to</strong>lerant of s<strong>to</strong>cktreading, <str<strong>on</strong>g>and</str<strong>on</strong>g> species such as white clover thatquickly col<strong>on</strong>ise bare ground created by severetreading. Weeds are also very comm<strong>on</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g>may include pennyroyal, buttercup, duckweed<str<strong>on</strong>g>and</str<strong>on</strong>g> dock. Pasture compositi<strong>on</strong> has littlerelati<strong>on</strong>ship <strong>to</strong> the original seed mixMODERATE CONDITION VS = 1Pasture species with a range of <strong>to</strong>lerances<strong>to</strong> waterlogging <str<strong>on</strong>g>and</str<strong>on</strong>g> s<strong>to</strong>ck treading arepresent, <str<strong>on</strong>g>and</str<strong>on</strong>g> pastures may c<strong>on</strong>tain anumber of weeds <str<strong>on</strong>g>and</str<strong>on</strong>g> forage herbsincluding dock, mayweed, pennyroyal <str<strong>on</strong>g>and</str<strong>on</strong>g>plantain. Pasture mix differs somewhatfrom that originally sownGOOD CONDITION VS = 2Pasture compositi<strong>on</strong> has a good mix ofhigh producing pasture species (e.g.,ryegrass, white clover <str<strong>on</strong>g>and</str<strong>on</strong>g> cocksfoot) <str<strong>on</strong>g>and</str<strong>on</strong>g>species in<strong>to</strong>lerant of poor aerati<strong>on</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g>waterlogging; few weeds. Pasturecompositi<strong>on</strong> reflects the original mixVISUAL SOIL ASSESSMENT: Volume 171