Root distribution in a low fertility hill country sward grazed by sheep

Barker, D. J.; Zhang, D. M.; Mackay, A. D.

doi:10.1080/03015521.1988.10425617

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…fallowed from October -May) hill pasture differed only in the upper 50 mm in that it was c. 40% less in the fallowed pasture (Nie et al 1997). Barker et al (1988) found large differences in total root mass (0-800 mm depth) between sunny and shady aspects in low fertility hill country, but the only significant difference was at 150-200 mm depth, and the aspect difference was probably confounded by species composition and grazing management differences.…”

Section: Management Effectsmentioning

confidence: 87%

The "root" to more soil carbon under pastures

Dodd¹,

Crush²,

Mackay³

et al. 2011

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Recent interest in building soil carbon in pastoral systems is driven by the imperative to mitigate greenhouse gas emissions. It has been proposed that increasing root growth via deep rooting plants is a means of increasing soil carbon storage. Data on root depth distribution and production from a number of New Zealand studies are summarised to examine whether variation in root profiles can be manipulated and exploited. Most of the variation in root mass under grazed grass-clover pastures occurs in the upper 100 mm of soil. Changes in pasture management, such as soil fertility, grazing intensity and pasture species composition have a limited effect on root mass below this depth layer, of the order ±10-30%. Greater mass and length of roots in deeper soil layers under grazed grass-clover pastures is associated with lower soil fertility, drought stress and less commonly sown pasture species. The relationship between root mass (particularly deeper-root mass) and soil carbon storage has yet to be clearly established. Keywords: pasture species, root mass, soil carbon, soil fertility

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Section: Management Effectsmentioning

confidence: 87%

The "root" to more soil carbon under pastures

Dodd¹,

Crush²,

Mackay³

et al. 2011

ProNZG

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“…Documented variation in pasture root mass and production in response to management and environmental drivers was presented in a previous NZGA paper , which noted that most of the variation in root mass under grazed grass-clover pastures occurred in the top 100 mm of soil. The studies examined included the effects of soil fertility Jacques 1943), grazing intensity (Matthew et al 1991;Nie et al 1997), species (Crush et al 2005;Evans 1978;McKenzie et al 1990), and aspect (Barker et al 1988). Additional, previously unpublished, data also presented in included the effects of phosphorus (P) and nitrogen (N) fertility and species.…”

Section: Introductionmentioning

confidence: 99%

Effects of soil fertility and compaction on root dynamics in a perennial ryegrass-white clover pasture

Dodd¹,

Mackay²

2013

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Pasture root mass and production were measured in two experiments in the Manawatu region. The first examined the effects of nitrogen (N) inputs and soil phosphorus (P) status over one year (2008/9) and the second examined the interacting effects of soil P status and artificial soil compaction over one year (2011/12). Root mass was measured by soil core sampling and root production was measured by an in-growth core technique, to 120 mm depth. Over most of the two periods studied there were no significant differences in root mass or production between treatments. However, higher N+P fertility resulted in 20% lower root mass but 32% higher root production during September and November 2008. In 2011/12, soil compaction reduced root production by approximately 22% yearround. Increased soil P fertility did not compensate for this effect. Fertility effects on root growth seem more influenced by N than P in this system. Keywords: nitrogen, phosphorus, root production, soil compaction

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“…Most of the root mass of grasses (approximately 80%) is concentrated in the upper 15 cm soil depth (Barker et al, 1988;Brazil et al, 2000). Rodrigues & Cadima-Zevallos (1991), Bono et al (2000) and Rodrigues et al (2001) reported that the soil depth of 0 to 20 cm would be responsible for the greatest proportion of root volume.…”

Section: Introductionmentioning

confidence: 99%

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

et al. 2011

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-The objective of this research was to evaluate the effect of combinations of nitrogen and sulfur rates in degraded signal grass (Brachiaria decumbens) pasture on their productive, morphological and nutritional attributes in the root system at four soil depths. The pasture used in the experiment was established over eight years ago in Entisol. Five nitrogen rates (0; 150; 300; 450 and 600 kg/ha/year) and five sulfur rates (0; 15; 30; 45 and 60 kg/ha/year) were combined in a fractionated factorial in a randomized block design, with three replications. Nitrogen was supplied as ammonium nitrate and sulfur as gypsum, and the rates were split into three times in the rainy season. The evaluations occurred at intervals of 35 days during the rainy season and 56 days in the dry season, in two consecutive years. Roots were collected with a 4-cm diameter auger at 0-10; 10-20; 20-30 and 30-40 cm soil depths. It was determined root dry matter, length and surface of the root system and nitrogen and sulfur concentrations in roots. Nitrogen rates applied in two consecutive years in the pasture affected dry mass, length, surface and nitrogen concentration in signal grass root system. Rates of sulfur by themselves or combined with nitrogen rates do not affect attributes of root system. Key Words: Brachiaria decumbens, dry mass, length, nitrogen concentration, surface Adubações com nitrogênio e enxofre durante dois anos em pastagem de capim-braquiária em degradação: alterações no sistema radicular RESUMO -Objetivou-se avaliar os efeitos das combinações de doses de nitrogênio e de enxofre em pastagem de capimbraquiária (Brachiaria decumbens) em degradação nos atributos produtivos, morfológicos e nutricionais do sistema radicular em quatro profundidades do solo. A pastagem utilizada no experimento foi estabelecida há mais de oito anos em solo Neossolo Quartzarênico. Cinco doses de nitrogênio (0; 150; 300; 450 e 600 kg/ha/ano) e cinco doses de enxofre (0; 15; 30; 45 e 60 kg/ha/ano) foram combinadas em fatorial fracionado, em delineamento de blocos ao acaso, com três repetições. O nitrogênio foi fornecido por meio de aplicação de nitrato de amônio e o enxofre por gesso, em doses parceladas em três vezes no período chuvoso. As avaliações ocorreram em intervalos de 35 dias no período chuvoso e de 56 dias no período seco, em dois anos consecutivos. As raízes foram coletadas por meio de trado de 4 cm de diâmetro nas profundidades de 0-10; 10-20; 20-30 e 30-40 cm do solo. Foram determinados a massa seca de raízes, o comprimento e a superfície radicular e as concentrações de nitrogênio e enxofre nas raízes. As doses de nitrogênio aplicadas em dois anos consecutivos na pastagem promoveram alterações nas raízes, em termos de massa seca, comprimento, superfície e concentração de nitrogênio no capim-braquiária. As doses de enxofre, isoladamente ou combinadas com as de nitrogênio, não promovem alterações nos atributos do sistema radicular.Palavras-chave: Brachiaria decumbens, comprimento, concentração de nitrogênio, massa seca, superfíc...

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Root distribution in a low fertility hill country sward grazed by sheep

Cited by 15 publications

References 10 publications

The "root" to more soil carbon under pastures

The "root" to more soil carbon under pastures

Effects of soil fertility and compaction on root dynamics in a perennial ryegrass-white clover pasture

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

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