Macropore effects in conventional tillage and no-tillage soils.: An article from: Journal of Soil and Water Conservation
Book Details
PublisherSoil & Water Conservation Society
ISBN / ASINB00096XTNA
ISBN-13978B00096XTN9
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Description
This digital document is an article from Journal of Soil and Water Conservation, published by Soil & Water Conservation Society on March 1, 1995. The length of the article is 5331 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: In an earlier study, it was shown that short-term (< 1 h) infiltration rates in the conventionally-tilled treatment (CT) of a 10-year-old tillage study near Griffin, Georgia, were reduced compared to the no-till treatment (NT), because of the presence of a surface crust. Our objective was to determine whether macropores were present in the NT treatment of this study and, if so, what effect macropores might have on the infiltration rate in NT and on chloride movement. We measured steady-state infiltration rates in the field with 98 cm (38.6 in) diameter rings. Macropore distributions were measured on intact soil columns 30 cm (11.8 in) in diameter and 40 cm (15.7 in) in length using ultramarine blue dye. We also used columns to determine the effect of a small simulated rain of 1 cm (0.4 in) immediately after chemical application on chloride (Cl) leaching in a larger rain of 16 cm (6.3 in) one week later. Macropores were evident near the surface in the NT treatment and constituted 15% of the cross-sectional area based on image-analysis of the dye stains. Long-term (> 2 h) steady-state ring infiltration rates were not reduced in NT plots compared to CT, in spite of a shallow hardpan in NT; this was attributed to macropores that penetrated the hardpan. A 1-cm rain immediately after chemical application reduced leachate concentrations of Cl by about half in both the NT and CT treatments. With the 1-cm initial rain, chloride had an opportunity to diffuse into stagnant regions of the matrix and as a result was excluded from flow in macropores and interaggregate space. Macropores will probably cause the greatest leaching losses when a chemical is applied to the surface of NT and a large rain occurs soon after application.
Citation Details
Title: Macropore effects in conventional tillage and no-tillage soils.
Author: M.H. Golabi
Publication:Journal of Soil and Water Conservation (Refereed)
Date: March 1, 1995
Publisher: Soil & Water Conservation Society
Volume: 50 Issue: 2 Page: 205(6)
Distributed by Thomson Gale
From the author: In an earlier study, it was shown that short-term (< 1 h) infiltration rates in the conventionally-tilled treatment (CT) of a 10-year-old tillage study near Griffin, Georgia, were reduced compared to the no-till treatment (NT), because of the presence of a surface crust. Our objective was to determine whether macropores were present in the NT treatment of this study and, if so, what effect macropores might have on the infiltration rate in NT and on chloride movement. We measured steady-state infiltration rates in the field with 98 cm (38.6 in) diameter rings. Macropore distributions were measured on intact soil columns 30 cm (11.8 in) in diameter and 40 cm (15.7 in) in length using ultramarine blue dye. We also used columns to determine the effect of a small simulated rain of 1 cm (0.4 in) immediately after chemical application on chloride (Cl) leaching in a larger rain of 16 cm (6.3 in) one week later. Macropores were evident near the surface in the NT treatment and constituted 15% of the cross-sectional area based on image-analysis of the dye stains. Long-term (> 2 h) steady-state ring infiltration rates were not reduced in NT plots compared to CT, in spite of a shallow hardpan in NT; this was attributed to macropores that penetrated the hardpan. A 1-cm rain immediately after chemical application reduced leachate concentrations of Cl by about half in both the NT and CT treatments. With the 1-cm initial rain, chloride had an opportunity to diffuse into stagnant regions of the matrix and as a result was excluded from flow in macropores and interaggregate space. Macropores will probably cause the greatest leaching losses when a chemical is applied to the surface of NT and a large rain occurs soon after application.
Citation Details
Title: Macropore effects in conventional tillage and no-tillage soils.
Author: M.H. Golabi
Publication:Journal of Soil and Water Conservation (Refereed)
Date: March 1, 1995
Publisher: Soil & Water Conservation Society
Volume: 50 Issue: 2 Page: 205(6)
Distributed by Thomson Gale
