Browse on keywords: soil quality residue management
Search results on 05/24/13
870. Black, A.L.. 1973. Soil property changes associated with crop residue management in a wheat-fallow rotation.. Soil Sci. Soc. Am. Proc. 37:943-946.
5245. Pikul, J.L. and R.R. Allmaras. 1986. Physical and chemical properties of a haploxeroll after fifty years of residue management.. Soil Sci. Soc. Am. J., 50(1):214-219.
Greater inference about the value of long-term crop residue management requires that soil chemical properties be measured together with soil physical properties. After 54 yrs of several different crop residue management treatments in a winter wheat-fallow system in the PNW, soil bulk density, saturated hydraulic conductivity, soil water desorption curves, soil organic carbon, and soil pH were all used to quantify the soil physical and chemical state. Quality of certain soil physical and chemical properties were altered. Changes in soil compaction since 1931 appear to be limited to the top 30m. However, soil compaction was greatest in the control and fall burn treatments where organic carbon addition was lowest. Crop residue management and fertilization with NH4 base fertilizer has had a marked effect on soil pH in the Ap horizon.
5872. Rickman, R.W. and B.L. Klepper. 1980. Wet season aeration problems beneath surface mulches in dryland winter wheat production.. Agron. J., 72:733-736.
Wet season aeration problems beneath surface mulches in dryland winter wheat production. Dentrification was a suspected cause of localized poor growth in winter wheat fields in the Northwest. Measurable anaerobic conditions occurred above and in restricting layers of slowly draining soils supporting poor growth but not in adjacent, unlayered soils supporting good growth. Surface mulch increased water infilitration in both soils but prolonged low oxygen levels in slowly draining soils. Beneath the mulch essentially all of the fertilizer N was lost on the slowly draining soil and yield was 35% lower than that on mulched normal soil.
10884. Collins, H.P., C.L. Douglas, and R.W. Smiley. 1989. Influence of crop residue management on heterotrophic bacterial diversity in wheat rhizosphers.. Agron. Abstracts, Amer. Soc. Agron. p. 212..
Over 3200 heterotrophic bacterial isolates were obtained from rhizospheres of wheat grown in long-term wheat-fallow and wheat-pea rotations at Pendleton, OR. Significant changes in microbial biomass and activity were identified, and the assays indicated differences in microbial diversity resulting from management.