Effect of nano urea on total NPK content in leaf and whole plant of French bean (Pole type) undernaturally ventilated polyhouse

Abstract

The present research was conducted during two seasons i.e., January-May 2022 and May-September 2022 atZonal Agricultural and Horticultural Research Station, Shivamogga under naturally ventilated polyhouse. The experimentwas laid out in randomized complete block design with eight treatments replicated thrice. The results of pooled data of twoseasons revealed that the treatment 75 % RDF (63 N kg ha-1) of N through prilled urea + 0.4 % nano urea foliar spray at 45and 60 days after sowing (DAS) (T6) recorded significantly higher total NPK content of leaves after third spray (N- 3.20 %,P- 0.52 %, K- 2.56 %) and total NPK content of whole plant at 60 days after sowing (N- 3.12 %, P-0.47 %, K- 2.52 %)However, it was observed that least values of NPK content in leaves after third spray and 60 DAS in 25 % RDF of Nthrough prilled urea + 0.4 % nano urea foliar spray at 30 and 45 DAS (T2). The treatment 75 % RDF (63 N kg ha-1) of Nthrough prilled urea + 0.4 % nano urea foliar spray at 45 and 60 days after sowing (DAS) (T6) recorded significantly higherof pod yield (17.16 t ha-1) and least (13.20 t ha-1) was observed in treatment 100 % RDF (63:100:75 NPK kg ha-1) (T1). Fromthe study, it was concluded that the treatment 75 % RDF of N through prilled urea + nano urea foliar spray 0.4 % at 45 and60 days after sowing was superior over all other treatments in terms of nutrient and pod yield