Acidification under grazed annual and perennial grass based pastures

Ridley, A. M.; Slattery, WJ; Helyar, K. R.; Cowling, Ann

doi:10.1071/ea9900539

Cited by 68 publications

(21 citation statements)

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“…Perennial grasses are considered to be more effective at reducing the development of soil acidity (Ridley et al 1990), compared with annual grasses and broad-leaf weeds. They utilise more soil water, which can reduce the risk of rising watertables, and the ground cover they provide over summer can also reduce the risk of erosion from storms which are commonly experienced on the Northern Tablelands.…”

Section: Discussionmentioning

confidence: 99%

Changes in botanical composition on three farmlets subjected to different pasture and grazing management strategies

et al. 2013

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Abstract. As part of the Cicerone Project's farmlet experiment, conducted on the Northern Tablelands of New South Wales, Australia, between July 2000 and December 2006, this study assessed the effects of varying soil fertility, pasture species and grazing management on the botanical composition of three 53-ha farmlets subjected to different management strategies. Starting with the same initial conditions, the farmlets were managed to reach different target levels of soil phosphorus (P) and sulfur (S); Farmlet A aimed at 60 mg/kg of Colwell P and 10 mg/kg S (KCl 40 ) whereas Farmlets B and C both aimed at 20 and 6.5 mg/kg of P and S, respectively. Pastures were renovated on six out of eight paddocks on Farmlet A, but only one paddock of each of Farmlets B (typical management) and C (intensive rotational grazing) was renovated. Flexible rotational grazing was employed on Farmlets A and B (each of eight paddocks) while Farmlet C used intensive rotational grazing over its 17 major paddocks, which were further subdivided into 37 subpaddocks. This paper focuses on the botanical composition dynamics observed across all three farmlets and the explanatory variables associated with those changes. Eight assessments of botanical composition were carried out at approximately annual intervals across each of the 37 major paddocks distributed across the farmlets and the results for each of 49 species were aggregated into seven functional groups for analysis. The strongest correlation found was a negative curvilinear relationship between sown perennial grasses (SPG) and warm-season grasses (WSG). The most significant factors affecting the functional group changes were soil P, sowing phase, paddock and date. These factors led to significant increases in SPG and correspondingly lower levels of WSG on Farmlet A compared with Farmlet B. Farmlets B and C experienced similar, declining levels of SPG, and increasing levels of WSG suggesting that intensive rotational grazing did not lead to substantial changes in botanical composition, compared with flexible rotational grazing, in spite of the fact that intensive rotational grazing had much longer grazing rests and shorter graze periods than the other two farmlets. Soil P levels were also significantly associated with levels of cool-season annual grasses, legumes and herbs, especially on Farmlet A. In general, the largest differences in botanical composition were between Farmlet A and the other two farmlets; these differences were most closely associated with those plants categorised as sown, introduced, C 3 pasture species. The levels of legume were generally low on all farmlets, due largely to the dry seasons experienced over most of the trial. Efforts to increase the legume composition on all farmlets were more successful on Farmlet A than on the other two farmlets due, presumably, to higher soil fertility on Farmlet A. Farmlet C, with its long rest periods and short graze periods, had a small proportion of legumes, due to the competitive effects of the accumulated tall grass herbage...

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Section: Discussionmentioning

confidence: 99%

Changes in botanical composition on three farmlets subjected to different pasture and grazing management strategies

et al. 2013

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“…Differences in root mass explained 73% of the variation in soil nitrate. Quin (1979), Ridley et al (1990), and Studdy etal. (1995) all recorded reductions in soil nitrate concentrations and/or nitrate leaching under Phalaris compared with Lolium.…”

Section: Introductionmentioning

confidence: 99%

Effect of different forage plants on denitrification potential of Horotiu soil

Crush

1998

New Zealand Journal of Agricultural Research

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Denitrification potential (DNP), watersoluble soil carbon, soil nitrate, and plant weights were measured in lysimeters growing cocksfoot, tall fescue, chicory, Yatsyn ryegrass, or Ruanui ryegrass in a New Zealand soil. The soil-related parameters were measured in the topsoil and upper-and lowersubsoil zones of the lysimeters. Significantly lower rates of DNP were measured under Ruanui ryegrass than under the other plants and there was a tendency for higher rates of DNP to be associated with bigger root masses. Water-soluble carbon was higher in the topsoil than in the upper-or lower-subsoil, but soluble carbon did not differ significantly among the cultivars. DNP responded positively to addition of glucose to the soil, demonstrating that soluble carbon rather than the resident populations of denitrifying micro-organisms were limiting DNP. Lysimeters growing cocksfoot had the lowest soil nitrate levels and the largest root systems but only intermediate rates of DNP. The quality of root residues entering the soil under cocksfoot is probably lower than for the other plants.

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“…Soil formation is a slow process, while soil physical, chemical and biological degradation processes, such as soil compaction [5], erosion [6], acidification [7,8], decline in organic matter content [9], etc., can occur relatively fast, especially in areas of agricultural land use [10,11]. The faster pedogenic processes reach steady state after tens to hundreds of years, while slow processes of soil formation evolve on a time scale of thousands to tens of thousands of years [12].…”

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confidence: 99%

Effects of Land Use and Management on SoilHydraulic Properties

et al. 2015

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Soil hydraulic properties are among the most important parameters that determine soil quality and its capability to serve the ecosystem. Land use can significantly influence soil properties, including its hydraulic conditions; however, additional factors, such as changes in climate (temperature and precipitation), can further influence the land use effects on soil hydraulic properties. In order to develop possible adaptation measures and mitigate any negative effects of land use and climatic changes, it is important to study the impact of land use and changes in land use on soil hydraulic properties. In this paper, we summarize recent studies examining the effect of land use/land cover and the associated changes in soil hydraulic properties, mainly focusing on agricultural scenarios of cultivated croplands and different tillage systems.

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Acidification under grazed annual and perennial grass based pastures

Cited by 68 publications

References 0 publications

Changes in botanical composition on three farmlets subjected to different pasture and grazing management strategies

Changes in botanical composition on three farmlets subjected to different pasture and grazing management strategies

Effect of different forage plants on denitrification potential of Horotiu soil

Effects of Land Use and Management on SoilHydraulic Properties

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