Abstract
A field experiment to study the effect of graded levels and split application of nitrogen on growth and physiological attributes of hybrid maize CO (MH) 6 was conducted at AC&RI, Madurai. The field was laid on RBD design with three replications with treatments RDN (250 kg/ha), and STCR (167 kg/ha) on 3 splits and nitrogen levels 225, 200, 175 and 150 kg/ha under 3 splits and 4 splits. Results showed that plant height was higher with T1 at 15, 30, 45DAS and with T7 at 60 and 75 DAS. At 45 DAS T1 showed better results with all the physiological attributes. Similarly at 30 DAS dry mater production and SPAD value was higher with T1. At 60 DAS T7 showed better leaf area index, SPAD value and dry mater production. T7 also showed significant results at 75 DAS with leaf area index and SPAD value. At harvest DMP was higher with T7. For CGR and RGR, at 30 to 40 DAS T1 showed higher results. Whereas from 40 to 60 DAS and 60 to Harvest T7 recorded higher CGR and RGR.
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