Soil samples were collected at 0–10 and 10–20 cm soil depth during the dry season (end of June 2007 in A1 and A2; and August 2007 in D1). On each farm four sub-plots were established within each treatment.
Soil samples were collected at 0–10 and 10–20 cm soil depthduring the dry season (end of June 2007 in A1 and A2; and August2007 in D1). On each farm four sub-plots were established withineach treatment.