Table 2: Soil organic carbon (SOC), organic (Po), inorganic (Pi), total extractable (Pte), total and extractable phosphorus (Pe), Po : (Po + Pi) relationships, and pH of different cropping systems (CS).

YearCSSOCPoPi Po : (Po + Pi)PtePtPe pH
%mg kg−1 mg kg−1

0Ref1.28189.0328.00.37529.0562.130.96.7
9WG1.13a*77.7a**294.7a*0.20a**289.6b**412.2b*14.3b**6.8a ns
WW0.89b**50.4b**172.0b**0.22a**230.0b**396.3b*11.7b**6.6b ns
WL1.14a*82.2a**290.5a*0.22a**417.3a*456.3a*33.7a ns6.6b ns
10WG1.08a133.7a231.1a0.37a396.7a418.0a10.2b6.4ab
WW0.84b75.5b159.0b0.32b344.1b378.2ab13.1b6.3b
WL1.11a107.3ab230.5a0.32b339.7b362.1b21.2a6.5a
11WG1.07a86.7217.5b0.38a350.2a440.0a15.7b6.3a
WW0.85b84.0176.3c0.32b316.8b407.2a18.8b6.3a
WL1.12a81.5245.7a0.33b289.7b328.4b26.0a6.1b
12WG1.16a85.4218.1b0.28a343.0a420.0a11.6b6.4a
WW0.95b65.7233.7ab0.22b365.2a411.3a27.2a6.1b
WL1.27a78.3250.2a0.24b280.1b321.6b10.4b6.2b

, and ns indicate statistical differences , and not significant, respectively, between each treatment sampled in year 9 and reference soil. For SOC, each P form and pH, different letters indicate differences among treatments in each year.