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- W1528871823 abstract "Hardpan soils of the southeastern Coastal Plains weremixed to depths up to 0.61 m in an attempt to alleviatestrength problems associated with a subsurface pan. Itwas hypothesized that mixing the dense, coarse-texturedE Horizon with the less dense Ap and the relativelyclayey B horizon would increase the water-holdingcapacity of the E and decrease its strength. Mixedsoil did have a higher amount of water held than theunmixed E, increasing it from 5 to 7% at -200 kPamatric potential. This would reduce its strength byapproximately 0.1 MPa allowing easier root penetrationwhether the increased water is available for uptake ornot. Although seed cotton in the deeply-mixedtreatments outyielded the moldboard-plowed treatmentsby 233 kg/ha in one year, they were outyielded by 132kg/ha in another year. The decrease in strength andthe increases of retention as a result of the mixingwere small and infiltration was unchanged.Furthermore, mixing of field samples was lesshomogenous than lab samples. It is doubtful that thelevel of improvement of cotton would warrant the effortinvolved in the mixing operation.Treatments at two sites were split into fertilitysubplots. The only significant fertility differencewas between rates of N sidedressed when plants wereabout 0.40 m tall. The 20 kg/ha rate outyielded the 67kg/ha rate by up to 300 kg/ha presumably because thehigher rate encouraged vegetative growth and retardedboll formation which in turn limited lint and seedproduction. Interactions between tillage or mixing andfertility were non-significant. Plants grew better inthe deeper disturbed soils in dryer years. Other cropsmay respond more favorably to the mixing." @default.
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- W1528871823 date "1988-01-01" @default.
- W1528871823 modified "2023-09-26" @default.
- W1528871823 title "Soil profile modification and cotton production" @default.
- W1528871823 hasPublicationYear "1988" @default.
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