The soil
in Nanning was a Ferralsol (FAO classification) with pH = 6.22,
organic matter = 24.2 g kg1
, available N = 142 mg kg1
, available
P = 34.8 mg kg1
, and available K = 123 mg kg1
; and in Changsha
was a Fluvisol with pH = 6.04, organic matter = 15.0 g kg1
, available
N = 137 mg kg1
, available P = 38.4 mg kg1
, and available K = 113
mg kg1
. The soil test was based on samples taken from the upper
20 cm (Ap horizon) of the soil. The cropping systems were
continuous rice in Nanning and rice-oilseed rape rotation in
Changsha.
Rice