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Published online 1 May 2008
Published in Soil Sci Soc Am J 72:798-807 (2008)
DOI: 10.2136/sssaj2006.0334
© 2008 Soil Science Society of America
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Soil Carbon and Nitrogen Changes in Long-Term Continuous Lowland Rice Cropping

Mirasol F. Pampolinoa, Eufrocino V. Laurelesa, Hermenegildo C. Ginesb and Roland J. Buresha,*

a Crop and Environmental Sciences Division, International Rice Research Institute (IRRI), DAPO Box 7777, Metro Manila, Philippines
b Philippine Rice Research Institute, Science City of Muñoz, 3119 Nueva Ecija, Philippines


Figure 1
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  		Fig. 1. Permanganate-oxidizable C (POC) expressed as a percentage of total soil organic C (SOC) at different soil depths and fertilizer treatments after more than 30 yr of continuous rice cultivation in double rice cropping with crop residue incorporation (LTFE) and triple rice cropping with all crop residue removed (LTCCE). Within a soil layer, bars with the same letter are not significantly different according to Tukey–Kramer (0.05).

 

Figure 2
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  		Fig. 2. Effect of long-term NPK fertilization on (a) soil organic C (SOC), (b) permanganate-oxidizable C (POC), (c) total N (NT), and (d) anaerobic N mineralization (ANM) at the topsoil (0–20 cm) with double-cropping and crop residue incorporation (LTFE), and triple-cropping with all crop residue removed (LTCCE) at the Bicol Integrated Agricultural Research Center (BIARC), IRRI, and Philippine Rice Research Institute (PhilRice) in the Philippines. Values shown are differences between N–P–K fertilization treatment and the control (no N–P–K for LTFE and no N for LTCCE). * Significant at the 0.05 probability level; ** significant at the 0.01 probability level; NS = not significant.

 




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