A field investigation was conducted at Water Technology Centre, College of Agriculture, during 2018-19 rabi season, Rajendranagar, Hyderabad. The experiment consisted of three replications in a Factorial Randomized Block Design (FRBD) with two factors, namely N levels (4) and K levels (3), and twelve treatments, namely N fertigation levels of 0 percent, 120 percent (216 kg N ha-1), 150 percent (270 kg N ha-1), 180 percent (324 kg N ha-1), and K fertigation levels of 0 percent, 80 percent (96 kg K2O ha-1), and 100 percent (120 kg K2O ha-1), The RDF was 180, 90, and 120 kg N, P2O5, and K2O ha-1, respectively. The soil texture at the experimental location was sandy loam, with low available nitrogen (166.5 kg ha-1), medium available phosphorus (81.1 kg P2O5 ha-1), and low in available potassium (245.4 kg K2O ha-1) The crop received a total of 414.8 mm of water. Among varied doses of nitrogen, application of 180 % N (324 kg N ha-1) recorded relatively higher plant growth parameters like plant height (97.29 cm), number of branches plant-1 (5.76), number of leaves plant-1 (57.29), LAI (1.743), SPAD chlorophyll reading (63.42), total dry matter production (1970.22 kg ha-1) followed by 150 % N (270 kg N ha-1). With regard to potassium fertigation, 100% K2O (120 kg K2O ha-1) recorded relatively higher plant growth parameters like plant height (96.84 cm), number of branches plant-1 (5.67), number of leaves plant-1 (56.98), LAI (1.671), SPAD chlorophyll reading (62.79), total dry matter production (1983.83 kg ha-1) followed by 80 % K2O (96 kg K2O ha-1). Hence for capsicum crop grown in naturally ventilated poly house during rabi season, application of 324 kg N and 120 kg K2O ha-1 by fertigation is recommended.

Poly house- capsicum-N and K fertigation schedule - growth parameters.

Finally, it can be concluded that, among different nitrogen fertigation levels,180% RD of N (324 kg N ha-1) recorded the highest value in all crop growth parameters i.e plant height, no. of branches, no. of leaves, LAI, SPAD chlorophyll reading, total dry matter production followed by 150 % RD (270 kg N ha-1) of N. Among different potassium doses, 100 % RD (120 kg K2O ha-1) of K2O recorded significantly higher values.

Gouthami, M. Uma Devi M., K. Avil Kumar and V. Ramulu (2022). Growth Parameters of Capsicum (Capsicum annuum var. grossum L.) as Influenced by Different Nitrogen and Potassium Fertigation Levels under Poly House. Biological Forum – An International Journal, 14(2): 624-629.