The soil is sandy loam with EC of
0.68 ds m1, pH of 8.1 and field capacity of 28.8%. Treatments
including companion crops (synchronic sowing of corn–red
clover, synchronic sowing of the corn–vetch, synchronic sowing
of corn–basil, and synchronic sowing of corn–dill) and
sowing date (T1: synchronic sowing of cover crops with corn
and T2: sowing cover crops 15 days after planting of corn)
were allocated in plots as a factorial based on RCB design with
3 replications.