Results (
Thai) 1:
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Experimental design and treatment descriptionThe trials were started in spring 2003 and ran until autumn2006. The experimental treatments tractor weight, ploughingdepth and wheel placement during ploughing were imposed everyspring, combined in a factorial split-split-plot design with threereplicated blocks at both sites. Tractor weight (light or heavy) wasallotted 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 mbetween large plots within blocks. Plot length was 40 min order toaccommodate the crop rotation described below.
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