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Soil Microbial, Chemical and Physical Properties in Continuous Cotton and Integrated Crop–Livestock Systems

^a USDA-ARS, Plant Stress and Water Conservation Lab., 3810 4th Street, Lubbock, TX 79415
^b Dep. of Plant and Soil Science, Texas Tech Univ., Lubbock, TX 79409

View larger version (49K): [in a new window]   Fig. 1. (A, B) Microbial biomass C and (C, D) N in soils under integrated crop–livestock system and continuous cotton system in November 2002 and July 2003. The bold crop signifies which crop the field is under at the time of the measurements. Similar letter at the same depth indicates no significant treatment differences according to least significant differences (LSD) at P < 0.05.

View larger version (38K): [in a new window]   Fig. 2. (A, B) ß-glucosidase and (C, D) ß-glucosaminidase activities in soils under integrated crop–livestock system and continuous cotton system in November 2002 and July 2003. The bold crop signifies which crop the field is under at the time of the measurements. Similar letter at the same depth indicates no significant treatment differences according to least significant differences (LSD) at P < 0.05.

View larger version (45K): [in a new window]   Fig. 3. Arylsulfatase activity of chloroform fumigated soil, non-fumigated, and fumigated minus non-fumigated soil of the integrated crop-livestock system and continuous cotton system in November 2002 and July 2003. The bold crop signifies which crop the field is under at the time of the measurements. Similar letter at the same depth indicates no significant treatment differences according to least significant differences (LSD) at P < 0.05.

View larger version (14K): [in a new window]   Fig. 4. Principal component analyses (PCA) of fatty acid methyl ester (FAME) profiles of soils under integrated crop–livestock system and continuous cotton system in November 2002 and July 2003.