Abstract
Irrigation induced erosion and land leveling have reduced yields on about 2 million acres in south central Idaho. Previous attempts to restore productivity on eroded silt loam soils to that of the original top soil have not been successful. This long term study was conducted to find a method(s) that would restore the productivity of exposed subsoils to that of topsoils and to determine the factor(s) limiting subsoil productivity. This study was initiated by removing the surface 12 inches of topsoil in strips between undisturbed strips of Portneuf silt loam (coarse-silty, mixed, mesic, Durixerollic Calciorthid) topsoil. Different crop rotations were established along the strips and fertilizer treatments were applied across the strips. Fertilizer treatments were applied the first year and were, conventional fertilizer applied according to soil tests, a heavy fresh dairy manure application and two cottage cheese (acid) whey rates. Dry edible beans (Phaseolus vulgaris L. cv. Viva) were grown on the entire plot area the forth year as the test crop. Crop rotations did not significantly effect overall bean yields the fourth year after topsoil removal. Applying 60 tons of dairy manure acre' (air dry basis) was the only treatment that restored bean production to that of the topsoil. Plant Zn and soil organic carbon were the only factors measured that correlated with bean yield increases on the subsoil plots.
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Claims 4
Claim · model-written summary
Crop rotations did not significantly affect fourth-year bean yields.
Not reportedComparator
Verbatim
e0“Crop rotations did not significantly effect overall bean yields the fourth year after topsoil removal.”
Claim · model-written summary
Dairy manure restored bean production on subsoil to topsoil levels.
Verbatim
e0“Applying 60 tons of dairy manure acre' (air dry basis) was the only treatment that restored bean production to that of the topsoil.”
Claim · model-written summary
Plant Zn correlated with bean yield increases on subsoil plots.
Verbatim
e0“Plant Zn and soil organic carbon were the only factors measured that correlated with bean yield increases on the subsoil plots.”
Claim · model-written summary
Soil organic carbon correlated with bean yield increases on subsoil plots.
Verbatim
e0“Plant Zn and soil organic carbon were the only factors measured that correlated with bean yield increases on the subsoil plots.”
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