Effect of different levels of drip irrigation regimes and fertigation on dry matter and nutrient uptake by Rabi sunflower (Helianthus annuus L.)

Abstract

A field experiment was conducted at Water Technology Centre, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad during rabi 2019-20 on “Response of rabi sunflower (Helianthus annuus L.) to different levels of drip irrigation regimes and fertigation”. The experiment was laid out in a split-plot design with DRSH-1 and replicated thrice. The treatments comprices of three irrigation treatments viz., surface drip irrigation at 0.8 Epan, 1.0 Epan and 1.2 Epan as main-plots and four fertigation treatments viz., 60% RD N & K2O, 80% RD N & K2O, 100% RD N & K2O and 120% RD N & K2O as sub-plots with recommended dose (RD) of nutrients of 75:90:30 kg NPK ha-1. Among drip irrigation regimes, drip irrigation was scheduled at 1.2 Epan recorded higher dry matter at harvest (6041 kg ha-1). On the other hand higher NPK uptake at harvest was obtained with drip irrigation with 1.2 Epan (73.8, 29.7 & 92.3 kg ha-1). Among sub-treatments fertigation with 120% RD N & K2O recorded higher dry matter (5950 kg ha-1) and NPK uptakes at harvest (72.8, 30.5 & 91.8 kg ha-1) than other fertigation levels. The interaction effect between irrigation regimes and fertigation levels on dry matter and uptake by NPK of rabi sunflower was not significantly influenced.