An Analysis of the Moisture Content of Soil Cores in a Designed Experiment

Roberts, E. A.; Raison, J M

doi:10.2307/2531345

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…Volumetric water content data were analysed by using treatment contrasts in a two-way (depth and time) repeated measures procedure combining contrasts over time (Evans and Roberts 1979) with contrasts over depth (Roberts and Raison 1983). A one-way repeated measures procedure was used for the macropore continuity data.…”

Section: Statistical Analysesmentioning

confidence: 99%

Changes in the physical properties of a vertisol following an irrigation of cotton as influenced by the previous crop

Hulme¹,

McKenzie²,

Abbott³

et al. 1991

Soil Res.

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Structural degradation of Vertisols depresses cotton lint yield by extending the period of waterlogging following irrigation or heavy rainfall. Break crops such as wheat and safflower are often grown without irrigation to improve the macroporosity of degraded Vertisols, by encouraging deep cracking, after several years of cotton production.Investigations were made into the effects of cultivated fallow, wheat and safflower on soil structure, and the growth of a subsequent cotton crop. The tests reported in this paper, done over a 12-day period following irrigation, were: soil water content and potential, core and clod bulk density, air-filled porosity, an index of macropore continuity using Rhodamine dye, and penetration resistance.The results, when compared with established limits of aeration and penetration resistance to cotton root growth, indicate that soil physical conditions at 0.25 m should have impeded root growth regardless of water content. However, cotton roots continued to extract water in this hostile soil environment; this favourable performance was attributed to the better conditions for root growth in the interaggregate fissures than those within aggregates.Apart from water content, all indicators of soil structure were able to differentiate consistently between the three crop treatments to a depth of 0.25 m. Below 0 . 8 m , the cropped plots, particularly safflower, had lower water contents than the fallow plots.

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Section: Statistical Analysesmentioning

confidence: 99%

Changes in the physical properties of a vertisol following an irrigation of cotton as influenced by the previous crop

Hulme¹,

McKenzie²,

Abbott³

et al. 1991

Soil Res.

View full text Add to dashboard Cite

show abstract

“…O estimador ajustado por um subconjunto das variáveis concomitantes ( f-*) apesar de não satisfazer esta propriedade tem sido bastante utilizado ( ver por exemplo, Allen, 1982 ou Roberts andRaison, 1983 ), sendo que várias propostas para a seleção das variáveis concomitantes têm sido apresentadas na literatura (por exemplo, Rao, 1965, Grizzle and Allen, 1969, Geisser, 1970, Fearn, 1977, Chinchilli and Carter, 1984, Kenward, 1985, Fujikoshi and Rao 1991ou Chinchilli and Gregg, 1991 .…”

Section: A Escolha De Variaveis Concomitan-tes No Modelo De Crescimentounclassified

Contribuições ao estudo de modelo de Potthoff e Roy para curvas de crescimento

Soler¹

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Sempre me senti uma pessoa de muita sorte, meu maior agradecimento é a Deus, por tudo que sou e tenho.Registro meu reconhecimento aos professores Julio da Motta Singer, Euclydes Custódio de . .Lima Filho e Paulo Roberto Curi, responsáveis pela minha orientação em três fases decisivas de minha formação acadêmica e profissional. Ao Prof. Renato Z. Táboas pela contribuição prestada sobre a utilização de alguns procedimentos numéricos de otimização implementados neste trabalho.À Loretta Casco pela c,juda que soube oferecer-me na demonstração de alguns resultados obtidos neste trabalho. À Rosangela Helena Loschi pela ajuda prestada na compreensão do editor de textos usado para escrever este trabalho. Agradeço-lhes principalmente pelo constante incentivo e amizade dedicados.

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A comparison of the effects of mineral and organic nitrogen sources on the distribution of wheat roots in a leaching environment

Diggle¹,

Bowden²,

D'Antuono³

1990

Soil Res.

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Wheat was grown under leaching conditions in columns in a glasshouse. Marked differences were observed in the root density profiles which resulted from addition of nitrogen in the form of either calcium nitrate or ground lupin leaves. The root profiles from the lupin leaf treatment had the highest density of roots at the surface and a continuous reduction in density with depth. Where calcium nitrate was added, total root growth was reduced, but there was enhanced growth of roots at depth associated with the leached nitrate. Water use was greater where lupin leaves were added, and the amount of top growth was also greater, although the difference was not significant. Nitrogen uptake was greater where calcium nitrate was added. Comment is included on the suitability of analysis of variance and repeated measurement methods for comparing profile data of the type collected here.

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An Analysis of the Moisture Content of Soil Cores in a Designed Experiment

Cited by 5 publications

References 4 publications

Changes in the physical properties of a vertisol following an irrigation of cotton as influenced by the previous crop

Changes in the physical properties of a vertisol following an irrigation of cotton as influenced by the previous crop

Contribuições ao estudo de modelo de Potthoff e Roy para curvas de crescimento

A comparison of the effects of mineral and organic nitrogen sources on the distribution of wheat roots in a leaching environment

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