Soil nitrate nitrogen dynamics after biosolids application in a tobosagrass desert grassland

Journal of Environmental Quality
Pedro Jurado-GuerraErnest B Fish

Abstract

Dormant-season application of biosolids increases desert grass production more than growing season application in the first growing season after application. Differential patterns of NO3-N (plant available N) release following seasonal biosolids application may explain this response. Experiments were conducted to determine soil nitrate nitrogen dynamics following application of biosolids during two seasons in a tobosagrass [Hilaria mutica (Buckl.) Benth.] Chihuahuan Desert grassland. Biosolids were applied either in the dormant (early April) or growing (early July) season at 0, 18, or 34 dry Mg ha(-1). A polyester-nylon mulch was also applied to serve as a control that approximated the same physical effects on the soil surface as the biosolids but without any chemical effects. Supplemental irrigation was applied to half of the plots. Soil NO3-N was measured at two depths (0-5 and 5-15 cm) underneath biosolids (or mulch) and in interspace positions relative to surface location of biosolids (or mulch). Dormant-season biosolids application significantly increased soil NO3-N during the first growing season, and also increased soil NO3-N throughout the first growing season compared to growing-season biosolids application in a year o...Continue Reading

References

Apr 24, 2003·Journal of Environmental Quality·F MartínezI Walter
Oct 11, 2003·Journal of Environmental Quality·W F JaynesD B Wester

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Citations

Jul 27, 2012·Journal of Environmental Management·Bradford P WilcoxFred E Smeins
Mar 31, 2009·Journal of Environmental Quality·S C SheppardJ Long

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