Výsledky vyhledávání

Soil biology and biochemistry - a new direction for South African soil science?

Autor: M. H. Graham, R. J. Haynes

Publikováno v: South African Journal of Plant and Soil. 21:330-344

The importance of soil biology and biochemistry is reviewed from a world perspective but using examples from South African research where appropriate. The significance and relevance of microbial biomass C, basal respiration, metabolic quotient and so

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c43695ea72251412c325f7461b09368f
https://doi.org/10.1080/02571862.2004.10635068

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Interactions between soil organic matter status, cropping history, method of quantification and sample pretreatment and their effects on measured aggregate stability

Autor: R. J. Haynes

Publikováno v: Biology and Fertility of Soils. 30:270-275

The effects of sample pretreatment (field-moist, air-dried or tension rewetted) on aggregate stability measured by wet sieving or turbidimetry were compared for a group of soil samples ranging in organic C content from 20 to 40 g C kg–1. Concentrat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7695be5e4493cedaeba774972fb569f2
https://doi.org/10.1007/s003740050002

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Size and activity of the soil microbial biomass under grass and arable management

Autor: R. J. Haynes

Publikováno v: Biology and Fertility of Soils. 30:210-216

The effects of 5 years of continuous grass/clover (Cont grass/clover) or grass (Cont grass) pasture or 5 years of annual grass under conventional (Ann grass CT) or zero tillage (Ann grass ZT) were compared with that of 5 years of continuous barley (L

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ed68abd68cf456664fc61e5a0d5850e
https://doi.org/10.1007/s003740050610

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Influence of stock camping behaviour on the soil microbiological and biochemical properties of grazed pastoral soils

Autor: R. J. Haynes, P. H. Williams

Publikováno v: Biology and Fertility of Soils. 28:253-258

The size and activity of the soil microbial biomass in grazed pastures was compared on the main grazing area and on stock camp areas where animals congregate. Two sites were on hill country and three on gently sloping border-dyke irrigated land. Due

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cbbd15458aa6bd991559f6e7e78beed2
https://doi.org/10.1007/s003740050490

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Effects of increasing periods under intensive arable vegetable production on biological, chemical and physical indices of soil quality

Autor: R. J. Haynes, R. Tregurtha

Publikováno v: Biology and Fertility of Soils. 28:259-266

The effects on soil condition of increasing periods under intensive cultivation for vegetable production on a Typic Haplohumult were compared with those of pastoral management using soil biological, physical and chemical indices of soil quality. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a96d99319df0f5f5d4ab3611c1a3f9bb
https://doi.org/10.1007/s003740050491

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A comparison of aggregate stability and biological activity in earthworm casts and uningested soil as affected by amendment with wheat or lucerne straw

Autor: R. J. Haynes, P. M. Fraser

Publikováno v: European Journal of Soil Science. 49:629-636

Summary The mechanisms responsible for stabilization of earthworm casts were investigated in a laboratory study. Earthworms (Aporrectodea caliginosa) were fed soil or soil amended with either ground wheat straw or lucerne hay. Cast material and uning

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::73e385f54c1a317d8d2ece6dd034cf6c
https://doi.org/10.1046/j.1365-2389.1998.4940629.x

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Micronutrient status of a group of soils in Canterbury, New Zealand, as measured by extraction with EDTA, DTPA and HCl, and its relationship with plant response to applied Cu and Zn

Autor: R. J. Haynes

Publikováno v: The Journal of Agricultural Science. 129:325-333

The Cu, Zn and Mn status of 44 fields from the Canterbury region of New Zealand under winter wheat was investigated in Spring 1993. Micronutrient status was assessed using EDTA, DTPA and HCl as extractants. The Mn status of soils was generally high a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1b734a769bd29ad8ff7748a16b638a61
https://doi.org/10.1017/s0021859697004735

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Fate and recovery of 15 N derived from grass/clover residues when incorporated into a soil and cropped with spring or winter wheat for two succeeding seasons

Autor: R. J. Haynes

Publikováno v: Biology and Fertility of Soils. 25:130-135

The fate of N when 15N-labelled perennial ryegrass/white clover residues were incorporated into field lysimeters (rate equivalent to 150kgNha–1) and two successive crops of winter or spring wheat were grown was investigated. Loss of 15N over the fi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ae65a965a251c49608e3526f7361bc28
https://doi.org/10.1007/s003740050292

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Imaging of optic nerve head drusen with the scanning laser ophthalmoscope

Autor: R J Haynes, John V. Forrester, Ayyakkannu Manivannan, S Walker, P F Sharp

Publikováno v: British Journal of Ophthalmology. 81:654-657

BACKGROUND Optic nerve head drusen may present diagnostic difficulties in cases of disc swelling. Imaging of the nerve in a search for drusen is often inconclusive, especially in children, where drusen may be buried below the surface of the nerve hea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b8a8cee25cf60bfb55332231d899d50
https://doi.org/10.1136/bjo.81.8.654

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