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This
is another paper looking at the shift from CT to CA and the issue of weeds and in this paper the weed seed bank. Two on-farm CA experiments were sampled at two sites in Bangladesh for the effects of strip planting (SP) and bed planting (BP), plus no-tillage
(NT) in one site with increased retention of the residue of previous crops (20% vs. 50%). The conventional tillage (CT) and 20% residue was the control treatment. The weed seedbank in 0–15 cm soil was quantified by assessing the emergence of weeds from soils
collected from the field after irrigation i rice and after wheat. The fewest number of weed species (especially broadleaf weeds), and the lowest weed density and biomass was in SP, followed by CT, BP, and NT, with 50% crop residue mulch. Relative to CT, the
SP, BP, and NT produced relatively more perennials weeds. They conclude that continuous CA, for 3 or more years, in two rice-based crop rotations, decreased the size of the weed seedbank, but increased the relative proliferation of specific perennial weeds.
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