with
sand 339 g kg
1
, silt 378 g kg
1
and clay 283 g kg
1
. The field had
been cultivated under double rice cropping system with winter
fallow for over five decades. Rice stubble (50–100 mm high) was
incorporated by using different powered machines into soil for
more than ten years. Before the establishment of this experiment,
the soil contained 23.1 g kg
1
of SOC, 1.64 g kg
1
of total N,
139.0 mg kg
1
of alkali-hydrolysable N, 5.8 mg kg
1
of Olsen P, and
81.6 mg kg
1
of available K. Soil pH in water (1:2) was 4.94