Chlorophyll content and spad value of rice (Oryza sativa l.) under different sowing windows and nutrient management practices

Abstract

The field experiment was conducted during kharif seasons of 2018 and 2019 in Agronomy research farm ,OUAT on rice using two dates of planting (10th july, 25th july) in main plot and three nutrient management practices (STBFR (Soil test based fertilizer recommendation), STBFR+GM, STBFR+FYM) in sub plot in a split plot design with four replications. Chlorophyll content as well as SPAD values of the crop measured at different growth stages of rice at 30 days interval revealed that chlorophyll a, chlorophyll b, total chlorophyll as well as SPAD values of the crop increased till 60 DAP and thereafter decreased. Early planting recorded higher chlorophyll a value of 2.36 mg g-1 of fresh leaf, chlorophyll b value of 1.26 mg g-1, total chlorophyll value of 3.62 mg g-1 and SPAD value of 44.73, while STBFR + GM treatment registered higher Chlorophyll a value of 2.55 mg g-1, Chlorophyll b value of 1.38 mg g-1, total chlorophyll value of 3.99 mg g-1 and SPAD value of 46.87. Leaf N content as well as grain yield is also found higher in early planting (2.58 %, 5008 kg ha-1) and STBFR + GM (2.74 %, 5015 kg ha-1). Significant positive linear relationship was observed between leaf N content and SPAD value of the crop which ultimately influences grain yield of the crop.