Dose and Method of Application of Metribuzin as Pre- and Post-emergence for Management of Phalaris minor in Zero-tillage Wheat with Rice Residue Retention
摘要
The introduction of technologies for optimal single-pass sowing solutions amidst crop residue in North-western India has created a new situation to deal with weeds in wheat under rice-wheat cropping system. There is need to enhance the weed management tactics, particularly in response to the emergence of Phalaris minor Retz. and the dwindling efficacy of herbicides. Weeds pose a significant menace to wheat yield in North-western India, necessitating the implementation of efficient weed management strategies. A field experiment was conducted across two consecutive crop seasons at the Rice Research Station, Kaul, CCS Haryana Agricultural University, Hisar, India. The primary objectives of the study were two fold: firstly, to determine the optimal dosage of metribuzin required as a pre-emergence (PRE), early post-emergence (EPOE), and post-emergence (POE) herbicide in a residue retention scenario for effective weed control; and secondly, to assess the comparative efficacy of metribuzin both with and without pinoxaden as POE herbicide. Pinoxaden (50 g ha−1) exhibited significant control over Phalaris minor with no effectiveness against broadleaf weeds. POE application of metribuzin at 350 g ha−1 applied as urea-mix broadcast at 35 days after sowing (DAS) along with pinoxaden at 50 g ha−1 as spray at 35 DAS resulted in superior control of Phalaris minor (1.8 & 4.1 m−2 in 2021–22 and 2022–23, respectively) and broadleaf weeds viz. Medicago denticulata Willd., Rumex dentatus L. and Melilotus indica L. All. (12.9 & 15.4 m−2 in 2021–22 and 2022–23, respectively) observed at 90 DAS under rice residue retention in zero-till system.