U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Wind Erosion and Water Conservation Research: Lubbock, TX
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                                    Software
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




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





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Acosta-Martinez, Veronicaitem
                                            Upchurch, Danitem
                                            PORTER, DANA - TAMU COLLEGE STATION
  Submitted to: American Peanut Research and Education Society Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/8/2002
                                    Publication  Date: 8/28/2003
                                    Citation: Acosta Martinez, V., Upchurch, D.R., Porter, D. 2002. Impacts of cotton and peanut rotations on a sandy soil:  organic matter, aggregate stability, microbial biomass, microbial community composition, and enzyme activities.Interpretive Summary:
                                Technical Abstract: The impacts of different cotton (Gossypium hirsutum L.) (=Ct) and peanut (Arachis hypogaea L.) (=Pt) rotations on a Brownfield fine sand soil (Loamy, mixed, superactive, thermic Arenic Aridic Paleustalfs) from West Texas, USA were investigated.  Soil surface samples (0-12.5 cm) were taken in March and June 2002 from PtPt at 75% (evapotranspiration ) ET irrigation, and from CtCt and PtCt at 50, 75 and 100% ET irrigation.  The samples were taken again in September 2002 when the rotations became PtPtPt, CtCtPt, and PtCtCt.  The soil contains 91% sand, 7% clay, and 2% silt.  The soil properties investigated were not affected by irrigation.  The soil total N and aggregate stability were not affected by crop rotations.   The soil pH was generally >8.0, however continuous peanut showed lowest soil pH values in comparison to the rotations.  In all the samplings, the soil organic C, the activities of beta-glucosidase, beta-glucosaminidase, acid phosphatase, alkaline phosphatase and phosphodiesterase, and the intracellular and total arylsulfatase activity were higher in continuous peanut than in the peanut-cotton rotations.  The soil enzyme activities in the peanut-cotton rotations were generally similar during March, June and September but there was a decrease in the soil enzyme activities from March to June in soils under PtPt.  Therefore, it appears that this change was not due to seasonal effects but to differences in enzyme stabilization in soil under different cropping systems.  The soil microbial biomass C (Cmic) was significantly higher under PtPt than under CtCt in March and under PtPt than under PtCt in June.  In September, there were no significant differences in soil Cmic among the systems, but it was increased in comparison to June sampling due to the rhizosphere effect on the soil microorganisms.  Fatty acids methyl ester (FAME) analyses, which provide a characterization of the soil microbial community structure, revealed higher concentrations of the fungi indicator fatty acids 18:2w6c and 18:1wc in the continuous peanut than in the peanut and cotton rotations in March and June.  For this sandy soil, in contrast to soils with higher contents of clay and organic matter, the continuous peanut tended to promote soil microbiological properties compared to crop rotations.  However, it is known that this is not a long-term sustainable system.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov