The present investigation on African marigold (Tagetus erecta L.) cv. Pusa Basanthi Gainda was conducted during Rabi season of 2016-2017 under agro-climatic condition of College of Horticulture, Anantharajupeta, Y.S.R Kadapa Dist. (Dr. Y.S.R.H.U). The experiment was conducted to study the influence of nutrients and Piriformospora indica on flowering and root of African marigold. The investigation was designed in Randomized Block Design, replicated thrice with 9 treatments. The results revealed that, the treatment combination i.e. 75% RDF + Piriformospora indica inoculated to seeds (T2) took minimum duration to full flowering (59.55 days), recorded maximum flower diameter (9.27 cm), fresh weight of total flowers plant-1 (394.47 g-1) and highest yield (29.06 t ha-1). Plants receiving 50 % RDF + Piriformospora indica inoculated to seeds (T3) produced higher number of flowers plant-1 (53.62). Among root attributes, significantly longer root (19.21 cm), higher root count (127.33), maximum root volume (39.33 m3) and root colonization of Piriformospora indica (75.09 per cent) were recorded in plants treated with 75% RDF + Piriformospora indica inoculated to seeds (T2).
