Integrated weed management in poplar (Populus deltoides)-turmeric (Curcumalonga) based agroforestry system in Punjab

摘要

A field study was conducted during 2013-14 and 2014-15 to find out the effective and economical approach for weed control in turmeric (Curcuma longa L.) grown under poplar (Populus deltoides Bartr.) block plantation which was established at 4 m x 3 mspacing in January 2012. Three pre-emergence herbicides (pendimethalin 0.75 and 1.0 kg/ha, oxyfluorfen 0.176 and 0.235 kg/ha, atrazine 0.563 and 0.75 kg/ha) were integrated with 9 t/ha paddy straw mulching during both the years except with atrazine during 2014-15. Integrated use of oxyfluorfen 0.235 kg/ha or pendimethalin 1.0 kg/ha with straw mulch provided similar level of weed control to that of 3 hand-weedings and increased rhizome yield of turmeric by 36-42% over weedy check. Pendimethalin 1.0 kg/ha+ straw mulch recorded higher benefit: cost ratio than hand-weedings. Atrazine + straw mulch recorded effective control of weeds, however it killed the poplar trees at both the levels; hence not safe for use in turmeric grown in poplar plantations. Treatment combinations of pendimethalin and oxyfluorfen with straw mulch were found to be safe for weed management in poplar-turmeric based agroforestry system.