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In the rabi (winter) season of 2020-21, a field experiment conducted at the Indian Agricultural Research Institute in New Delhi. The experimental employed a split-plot design, encompassing four distinct tillage practice in the main plots and four nitrogen management approaches in the sub-plots, all replicated thrice. The results show that, residue retention in zero tillage recorded significantly lower weed density and weed dry matter and higher grain yield (4.99 t/ha) over other treatments. Similar results also recorded under different nitrogen management practices, where LCC-guided N application has significantly lower weed density and weed dry matter and higher grain yield (5.39t/ha) over remaining treatments. The LCC-guided nitrogen application practice in residue retained zero tillage can be recommended for wheat farmers under rice-wheat system. This combined approach not only enhances weed control but also elevates overall productivity, signifying its potential as an effective and sustainable practice for optimizing wheat yields.
Sudarshan et al. (Sun,) studied this question.