J. KRUPA AMRUTHA*, D. SAMPATH KUMAR, A.V. NAGAVANI , G. P. LEELAVATHY AND V. CHANDRIKA

Department of Agronomy, S.V. Agricultural College, ANGRAU, Tirupati-517 502.

ABSTRACT

A field experiment was conducted at Agricultural Research Station, Kadiri, during Rabi, 2024-25 to evaluate the effect of nano DAP on the growth and yield of groundnut. The experiment consists of 50% recommended dose of P2O5 + One spray of Nano-DAP at 30-35 DAS (T₁), 50% recommended dose of P₂O₅ + Two sprays of Nano-DAP at 30-35 and 50-55 DAS (T₂), 75% recommended dose of P₂O₅ + One spray of Nano-DAP at 30-35 DAS (T₃), 75% recommended dose of P₂O₅ + Two sprays of Nano-DAP at 30-35 and 50 -55 DAS (T₄), 100% recommended dose of P₂O₅ + One spray of Nano-DAP at 30-35 DAS (T5), 100% recommended dose of P₂O₅ + Two sprays of Nano-DAP at 30-35 and 50-55 DAS (T₆), Foliar application of Nano-DAP @2.5 ml l -1 twice at 30-35 and 50-55 DAS (T₇), 100% RDP ( 40 kg P₂O₅ ha-1), (T₈) and Absolute control (T₉). This experiment was laid out in RBD with nine treatments and three replications. Various levels of nano DAP treatments were evaluated. Among the tested treatments application of 100% recommended dose of P2O5 along with two sprays of Nano-DAP@ 2.5 ml l-1 at 30- 35 and 50-55 DAS (T₆) recorded Significantly higher plant height, leaf area index, dry matter production and yield attributes pod and haulm yield. The results indicates that improved phosphorus availability and uptake efficiency due to the synergistic effect of soil-applied phosphorus and foliar-feed nano DAP. The nano form of DAP likely ensured better nutrient absorption through the foliage, reduced nutrient losses and enhanced physiological activity, contributing to better vegetative growth and reproductive development.

KEYWORDS: Foliar nutrition, nano DAP, groundnut.