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 Wind Erosion and Water Conservation Research: Lubbock, TX
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ARS Home Plains Area Lubbock, Texas Cropping Systems Research Laboratory Wind Erosion and Water Conservation Research Research Publications at this Location





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Title:   Author  item
                                            BRONSON, KEVIN - TAMUitem
                                            Zobeck, Teddyitem
                                            CHUA, T - TAMUitem
                                            Van Pelt, Robert

                                                         - *Scott*item
                                            Acosta-Martinez, Veronica
  Submitted to: Agronomy Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/11/2003
                                    Publication  Date: 11/2/2003
                                    Citation: Bronson, K., Zobeck, T.M., Chua, T.T., Van Pelt, R.S., Acosta Martinez, V. 2003. Carbon and nitrogen pools of southern high plains grassland and cultivated soils. American Society of Agronomy Abstracts. 2003 CDROM.Interpretive Summary:
                                Technical Abstract: Carbon and N contents in soils have long been recognized as important indicators of soil productivity.  The current low levels of soil C and N of cropland soils have led to interest in requestering C with reduced tillage cropping systems and with the Conservation Reserve Program (CRP).  Our objective was to determine the effect of agroecosystem on soil C and N pools in the Southern High Plains.  These included three cotton (Gossypium hirsutum L.) cropping systems and two grassland systems (CRP or native rangeland (NR)).  We sampled 0-5, 5-10, 10-20, and 20-30 cm soil depths at eleven farm sites in four counties.  Each system had five or six replicates or farm sites.  Total soil C and N, particulate organic matter (POM)-C and 'N, delta 13C of POM and whole soil, potentially mineralizable C and N, water-extractable-C (WEC), and extractable NH4 and NO3 were determined. Total C and N in the 0-30 cm soil profile was 33 Mg C/ha and 2.5 Mg N/ha for NR, and 22.4 Mg C/ha and 2 Mg N/ha for cropland systems, respectively.  Total soil C and N in CRP were greater than in cropland soils only in the 0-5 cm surface layer.  Labile C and N pools were positively correlated with each other and with total soil C and N.  The relatively short time the CRP sites were in place (10-15 yr) apparently limited C and N sequestration.


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