Biology and Fertility of Soils

, Volume 47, Issue 6, pp 655–667 | Cite as

Dryland cropping systems influence the microbial biomass and enzyme activities in a semiarid sandy soil

  • Veronica Acosta-Martínez
  • Robert Lascano
  • Francisco Calderón
  • Jill D. Booker
  • Ted M. Zobeck
  • Dan R. Upchurch
Original Paper

Abstract

Indicators of soil quality, such as microbial biomass C and N (MBC, MBN) and enzyme activities (EAs), involved in C, P, N, and S cycling, as affected by dryland cropping systems under conventional (ct) and no tillage (nt) practices were evaluated for 5 years. The soil is sandy loam with an average of 16.4% clay, 67.6% sand, and 0.65 g kg−1 OM at 0–10 cm. The crops evaluated were rotations of grain sorghum (Sorghum bicolor L.) or forage sorghum (also called haygrazer), cotton (Gossypium hirsutum), and winter rye (Secale cereale): grain sorghum–cotton (Srg–Ct), cotton–winter rye–sorghum (Ct–Rye–Srg), and forage sorghum–winter rye (Srf–Rye). The tillage treatments did not affect soil MB and EAs of C cycling (i.e., β-glucosidase, β-glucosaminidase, α-galactosidase), P cycling (alkaline phosphatase, phosphodiesterase), and S cycling (arylsulfatase)—except for separation due to tillage for Srf–Rye and Ct–Rye–Srg observed in PCA plots when all EAs were evaluated together. After 3 years, rotations with a winter cover crop history (Ct–Rye–Srg and Srf–Rye) enhanced soil MBN (up to 63%) and EAs (21-37%) compared to Srg–Ct. After 5 years, Srg–Ct and Ct–Rye–Srg showed similar soil MBC, MBN, EAs, total carbon (TC), and organic carbon (OC). A comparison of Srg–Ct plots with nearby continuous cotton (Ct–Ct) research plots in the same soil revealed that it took 5 years to detect higher TC (12%), MBC (38%), and EAs (32–36%, depending on the enzyme) under Srg–Ct. The significant improvements in MB and EAs found, as affected by dryland cropping systems with a history of winter cover crops and/or higher biomass return crops than cotton, can represent changes in soil OM, nutrient cycling, and C sequestration for sandy soils in the semiarid Texas High Plains region. It is significant that these soil changes occurred despite summer crop failure (2003 and 2006) and lack of winter cover crops (2006) due to lack of precipitation in certain years.

Keywords

GRACEnet Ogallala Aquifer FAME analysis Microbial biomass Dryland Cotton Cropping systems 

Notes

Acknowledgements

The initiation of this study in 2003 was possible due to the funding from the Ogallala Aquifer Research Initiative in that year. This research was also supported by the Agricultural Research Service under the GRACEnet Project.

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Copyright information

© Springer-Verlag (outside the USA)  2011

Authors and Affiliations

  • Veronica Acosta-Martínez
    • 1
  • Robert Lascano
    • 1
  • Francisco Calderón
    • 2
  • Jill D. Booker
    • 1
  • Ted M. Zobeck
    • 1
  • Dan R. Upchurch
    • 3
  1. 1.Cropping Systems Research Laboratory, Wind Erosion and Water Conservation UnitUSDA-ARSLubbockUSA
  2. 2.Central Great Plains Resources Management ResearchUSDA-ARSAkronUSA
  3. 3.Southern Plains AreaUSDA-ARSCollege StationUSA

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