Results (
Thai) 1:
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Experimental design and treatment description
The trials were started in spring 2003 and ran until autumn
2006. The experimental treatments tractor weight, ploughing
depth and wheel placement during ploughing were imposed every
spring, combined in a factorial split-split-plot design with three
replicated blocks at both sites. Tractor weight (light or heavy) was
allotted to large plots (16 mwidth), ploughing depth (15 or 25 cm)
to medium plots (8 m width) and wheel placement (on-land or infurrow)
to small plots (4 m width). There was a border of 2 m
between large plots within blocks. Plot length was 40 min order to
accommodate the crop rotation described below.
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