Seedling vigour index and productivity of greengram as influenced by pre-and post-emergence herbicicdes applied to maize

Abstract

A field experiment was conducted in greengram during rabi, 2016-17 at S.V. Agricultural college, Tirupati campus of Acharya N.G.Ranga Agricultural University, Andhra Pradesh, India, to know the residual effect of pre-and post-emergence herbicides applied to preceding maize crop on succeeding greengram in a randomized block design with ten weed management practices. Sequential application of pre-emergence herbicides (alachlor 1000 g ha-1 and atrazine 1000 g ha-1) followed by post-emergence herbicides (Halosulfuron-methyl 67.5 g ha-1, Tembotrione 100 g ha-1 and 2,4-D Sodium salt 800 g ha-1) applied to maize did not show any residual / inhibitory effect on succeeding greengram. Among the different pre-and post-emergence herbicides applied to maize, pre-emergence application of alachlor 1000 g ha-1 fb post-emergence application of halosulfuron-methyl 67.5 g ha-1 + tembotrione 100 g ha-1 imposed to maize resulted in reduced dry weight of weeds associated with succeeding greengram at 15 DAS due to its extended weed control efficiency even in greengram.Root and shoot length including seedling vigour index and yield components and yield of succeding greengram recorded at their highest values with the above said weed management practice imposed to maize