2.2. Experiment 2
A two-factorial mesocosm experiment was designed to test
the effects of ditch-buried straw return on soil nitrogen retention
under greenhouse conditions. The two factors included straw
burial level and fertilization level. Straw burial included two levels:
no straw or straw; fertilization levels included: 0 kg N ha−1,
135 kg N ha−1, 270 kg N ha−1, 540 kg N ha−1 and 1080 kg ha−1.
Each treatment was replicated three times so there were, in total,
30 mesocosms.