Biomass partitioning of maize crop under different microclimatic conditions

Field experiments were conducted during Kharif seasons of 2004 and 2005 to study the partitioning of biomass in maize crop under different microclimatic conditions created by different agronomic practices like dates of sowing, spacing and moisture levels. The total above ground biomass accumulation was found higher in irrigated condition as compared to the rainfed condition. It was found higher when the crop was sown on June 10 (D₁), as compared to delayed sowing (June 25-D₂) under both rainfed and irrigated conditions. The contribution of dry matter production towards leaves was more than stem before tassel initiation; however, with the commencement of reproductive phase, the biomass accumulation was diverted more towards the stem followed by leaves and reproductive parts upto dough stage. Delay in sowing caused reduction in the biomass accumulation in different parts. Further, wider spacing produced higher biomass than narrow spacing and broadcasting. The higher biomass accumulation led to better source and sink relationship.