Significance of K and S sources and methods of application on nutrient use efficiency of irrigated groundnut
1S. Naveenkumar, 1*C. Ravikumar, 1R. Rex Immanuel, 2P. Senthilvalavan and R. Manivannan
1Department of Agronomy, and 2Department of Soil Science and Agricultural Chemistry, Faculty of Agriculture, Annamalai University, Annamalainagar-608002 (India) *Corresponding author: ravikumarchinnathambi@gmail.com
ABSTRACT
The field experiments were conducted in the Kharif and rabi season of 2021 at the farmer’s field of Perampattu Village, Tirupattur Tk&Dt to study the significance of K and S management in groundnut. The experiment was laid out in Randomized Block Design (RBD) with the following treatments viz., T1-Control, T2–RDF (Blanket Recommendation as 25:50:75 kg NPK ha-1), T3- RDF + Add 0.25 % of K through MOP (Foliar Application), T4– RDF + Add 0.5 % of K through MOP (Foliar Application), T5– RDF + Add 0.25 % of K through SOP (Foliar Application), T6– RDF + Add 0.5 % of K through SOP (Foliar Application), T7– RDF + Add 0.25 % of K through KNO3 (Foliar Application), T8– RDF + Add 0.5 % of K through KNO3 (Foliar Application) and replicated thrice. A significantly higher percentage of agronomic use efficiency (15.07 & 14.94), potassium use efficiency (23.12 & 26.87) was recorded in the treatment of T4 and sulphur use efficiency of (22.2 & 21.4 %) was noticed in T6.