Dry matter accumulation and nutrient uptake of transplanted rice and zero till maize as influenced by nutrient levels and weed management practices

Abstract

“A field experiment was conducted during “kharif” and “rabi” seasons of 2022-23 and 2023-24 at S.V. Agricultural College Farm, Tirupati in “split-plot design” with three replications to know the effect of different nutrient levels and weed management practices on transplanted rice and zero till maize. Among the different nutrient levels, significantly higher dry matter production, nutrient uptake and grain and straw yield were obtained with the application of 150% RDF in transplanted rice fb 125% RDF in zero till maize. Among the weed management practices tested, higher dry matter production, nutrient uptake and grain and straw yield were recorded with HW twice at 20 and 40 DAT, which was at par with PE application of triafamone + ethoxysulfuron 67.5 g ha-1 fb halosulfuron-methyl 67.7 g ha-1 + fenoxaprop-p-ethyl 60 g ha-1 at 20 DAT in transplanted rice. In zero till maize, HW twice at 20 and 40 DAS recorded the higher dry matter production, nutrient uptake and kernel and stover yield which was statistically comparable with PoE application of mesotrione + atrazine 875 g ha-1 at 20 DAS fb HW at 40 DAS on sandy clay loam soils of “Southern Agro-Climatic Zone of Andhra Pradesh”. The lowest higher dry matter production, nutrient uptake and yields were obtained with the application of 100% RDF in transplanted rice fb 75% RDF in zero till maize. Unweeded check (W6) resulted in lower dry matter production, nutrient uptake and grain and straw yield in both the crops”.