Effect of organic nitrogen management on chlorophyll index and greenness index of basmati rice in ricewheat cropping system

A two-year field experiment was conducted at the Research Farm Division of Agronomy, Indian Council of Agricultural Research-Indian Agricultural Research Institute (ICAR-IARI), New Delhi, during the Kharif seasons of 2019 and 2020. A field experiment was carried out in a strip plot design and replicated thrice. Treatment consists of two cropping systems (basmati rice-wheat-green gram and basmati rice-wheatSesbania) in columns and 7 nutrient management options (T1-Control, T2-FYM equivalent to 80 kg N ha-1, T3-Vermicompost equivalent to 80 kg N ha-1, T4-FYM equivalent to 80 kg N ha-1+Crop residues @ 2.5 t ha - 1 , T5-Vermicompost equivalent to 80 kg N ha-1 plus crop residues@ 2.5 t ha-1, T6-T4 + biofertilizers, and T7- T5 + biofertilizers) in rows. The soil was saline in reaction, sandy loam in texture, and low in available N, P, and K. Results of the field experiment showed that inclusion of green gram and Sesbania as summer green manuring had no significant effect on the chlorophyll index (CI) and greenness index (GI) at various growth stages of organic basmati rice during 2019-20. However, both CI and GI differed significantly under organic nitrogen management options.