Weed populations of intensive rice based cropping system as affected by tillage and increased crop residues in Bangladesh
| Main Authors: | Mohammad Mobarak Hossain, Mahfuza Begum, Abul Hashem, Md. Moshiur Rahman, Richard W. Bell |
|---|---|
| Format: | Article Journal |
| Terbitan: |
, 2021
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/4892291 |
Daftar Isi:
- Sifting to conservation tillage from conventional one makes weeds control more difficult due to the absence of tillage. In the longer term, conservation tillage may alter the floristic composition of weeds in the soil seedbank. The nature of weed seedbank changes over time in intensively cropped rice-based rotations in Bangladesh is not well understood. Two long-term experiments (at Rajshahi and Rajbari) were sampled at 0-15 cm soil depth to study the effects of strip tillage (ST) and bed planting (BP) at both sites and Zero tillage (ZT) at Rajbari plus retention of residues of previous crops (20 vs. 50%) on floristic composition of weeds. The emergence of weeds was assessed from seedling trays in a net-house experiment during January-December 2016. Results revealed the fewest number of weed flora and lowest weed density was found in ST, followed by CT, BP, and ZT with 50% crop residues. The ST, BP, and ZT produced a higher number of perennials weeds than annual weeds, which was the opposite of CT. The long-term practice of ST and increased crop residue retention decreased weed explosion but increased the relative proliferation of perennial weeds compared to CT. The composition of weed flora in ST was even smaller than BP and ZT.