Effect of Non-Chemical Weed Management Approaches on Yield and Nutrient Uptake in High Density Planting of Cotton in Vertisol of Northern Karnataka

In order to investigate the impact of non-chemical eco-friendly weed management strategies on yield, nutrient uptake, and soil balance high density planting cotton in deep vertisols, a field experiment was carried out 2017 2018 at Department Agronomy, College Agriculture, UAS, Raichur. Three replications were used experiment's Randomized Completely Block Design layout. There 14 different interventions used, including polythene mulch, paddy straw stalk intercropping with green manures 1:1 ratio (sunnhemp cowpea), four botanical extracts 20% as PE (Eucalyptus sp., Prosopis juliflora extract, Cassia tora, Parthenium hysterophorus), mechanical, cultural, their combination, comparison weed-free check. replicated randomised complete block design conduct experiment. The two years pooled data showed that, compared other treatments, free check had significantly higher seed production (1,722 kg /ha). It then followed by Cotton + Sunnhemp (1:1) in-situ mulching 45 DAS (1299 /ha), pendimethalin 38.7 CS @ 680 g a.i./ha fb pyrithiobac sodium 10 EC 75 quizolofop ethyl 37.5 25 PoE (1274 environmentally friendly such sunnhemp DAS, black sheet, cowpea others, par may be suggested since they best options.