Spatial and Temporal Distribution of Nitrogen in Maize under Drip Fertigation

Field experiment was conducted during kharif 2018, rabi 2018-19 and kharif 2019 at Dr. NTR College of Agricultural Engineering, Bapatla, Andhra Pradesh to study the spatial and temporal distribution of nitrogen in maize. The experiment was laid out in split plot design consisting of three irrigation levels 0.6, 0.8 and 1.0 ETc and four nitrogen levels consisting of fertigation levels 80%, 100%, 120% RDN on sandy clay loam soil. There were significant variation due to irrigation and fertility levels at all the stages of crop growth. Generally, the availability of nitrogen increased when irrigation as well as fertilizer level increased up tomaturity stage. The maximum available nitrogen was in the depth of 0- 30 cm range and then decreased vertically.