Site Soil type   UPLB Anthraquic Gleysols IRRI Anthraquic Gleysols     2008/2009 DS 2009 WS 2010 WS 2010/2011 DS pH (1:1) - 6.9 6.8 6.9 6.5 Total organic C g kg−1 18.6 15.9 16.2 15.0 Total soil N g kg−1 2.7 1.6 1.5 1.5 Olsen P mg kg−1 55 40 35 30 Avail K cmol kg−1 - - 1.26 1.32 Exch K cmol kg−1 1.50 1.06 1.50 1.50 Exch Ca cmol kg−1 - - 18.9 18.1 Exch Mg cmol kg−1 - - 13.5 13.3 Exch Na cmol kg−1 - - 1.01 1.00 CEC cmol kg−1 - - 33.6 33.0 Clay g kg−1 - - 441 445 Silt g kg−1 - - 332 355 Sand g kg−1 - - 227 200

Table 1: Average top-soil characteristics (0–15 cm depth) for all experimental seasons and both experimental sites.