Influence of nano DAP on growth and yield attributes of Sunflower (Helianthus annuus L.) during kharif season

A field experiment was carried out during kharif, 2024 at Experimental Farm of Agronomy section, College of Agriculture, Latur to study the influence of nano-DAP on growth and yield attributes of sunflower (Helianthus annuus L.) during kharif season. The soil of experimental plot was clayey in texture. The experiment was laid out in Randomized Block Design (RBD) with eight treatments replicated thrice. The treatments were T₁ - Control (No Fertilizer), T₂ - 100% RDF, T₃ - 100% RDF + Two spray of 2% DAP, T₄ - 100% RDF + Two spray of 0.4% Nano DAP, T₅ - 75% RDF + Two spray of 2% DAP, T₆- 75% RDF + Two spray of 0.4% Nano DAP, T₇ - 75% RDF + One spray of 2% DAP @ 30 DAS + One spray of 0.4% Nano DAP @ 45 DAS and T₈ - 75% RDF + One spray of 0.4% Nano DAP @ 30 DAS + One spray of 2% DAP @ 45 DAS. The result revealed that the growth and yield attributes of sunflower were influenced significantly due to the different treatments. Application of 100% RDF + Two spray of 0.4% Nano DAP (T₄) recorded significantly highest plant height (199.33 cm), number of functional leaves plant^-1 (31.23), leaf area plant^-1 (63.87 dm²), stem girth plant^-1 (8.57 cm), head diameter plant^-1 (18.74 cm), dry matter accumulation plant^-1 (133.52 g) and seed yield (2443 Kg ha^-1), being at par with the application of 100% RDF + Two spray of 2% DAP (T₃) and superior over rest of the treatments.