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Full-Text Articles in Life Sciences
Overwinter Changes In Dry Aggregate Size Distribution Influencing Wind Erodibility In A Spring Wheat-Summerfallow Cropping System, Stephen D. Merrill, Alfred L. Black, Ted M. Zobeck
Overwinter Changes In Dry Aggregate Size Distribution Influencing Wind Erodibility In A Spring Wheat-Summerfallow Cropping System, Stephen D. Merrill, Alfred L. Black, Ted M. Zobeck
Journal of the Minnesota Academy of Science
A long-term study of the wind erodibility properties of a two-year spring wheat-summerfallow cropping systems was started in 1988 in south-central North Dakota as part of an USDA-ARS led effort to construct a process-oriented soil erosion predictive model. Observations were conducted on a conservation tillage experiment established in 1984 on soil classified in the U.S. as Typic-Pachic Haploborolls and in Canada as Brown to Dark Brown Chenozemic. The experiment included four residue-management treatments defined by targeted residue coverages: no-till, > 60% cover; minimal-till, 30% to 60% cover and undercutter dominated; conventional-till, < 30% cover and disk dominated; low-residue, < 5 % cover. Fall and spring measurements of dry aggregate size distribution (ASD) of surface soil (0 to 4 cm depth), and overwinter changes in ASD are reported here. A rotary sieve produced six size fractions ranging from < 0.42 mm to > 19.2 mm diameter. Measurements of ASD are expressed as geometric …
Impact Of Narrow Alternate Strip Crop Systems On Crop Yield And Residue Cover, T. K. Iragavarapu, G. W. Randall
Impact Of Narrow Alternate Strip Crop Systems On Crop Yield And Residue Cover, T. K. Iragavarapu, G. W. Randall
Journal of the Minnesota Academy of Science
Current corn (Zea mays L.) and soybean (Glycine max L.) production practices used by many US farmers are quite energy intensive while allowing excessive soil erosion. An experiment was conducted at two locations in southern Minnesota on a Webster clay loam soil to investigate narrow (4.57-m), alternate strip systems planted on ridges (ridge tillage). A 3-crop [corn-soybean-wheat (Triticum aestivum L.) interseeded with Nitro alfalfa (Medicago sativa L.) or hairy vetch (Vicia villosa Roth)] system was compared to a conventional corn-soybean strip system. Rows were oriented N-S at one location and E-W at the other. Results from 3 years suggest that …