Author(s):

Pabitra Adhikary, Partha Sarathi Patra, Hasim Reja, Sukanta Saren and Babulal Tudu

Abstract: The experiment was conducted during two consecutive rabi seasons of 2013 and 2014 at the Krishi Vigyan Kendra Farm, Ashokenagar, West Bengal, India to determine the effect of omitted nutrients on productivity of sunflower. The influence of nutrient omissions on the soil health was also determined. The results clearly indicated positive response of NPK fertilization to sunflower. Ample NPK (125% RDF) recorded maximum plant height (1.69 m), basal girth (9.08 cm) and capitulam diameter (17.15 cm) and differed significantly from other treatments. Nutrient omitted plots showed significant reduction in growth attributes over ample NPK (N₁₀₀P₅₀K₅₀). Sunflower plants produced higher yield attributes (972.14 seeds capitulum^-1, 75.74 g seed weight capitulum^-1 and 5.84 g for 100 seed weight and seed yield (1723.27 kg ha^-1) of sunflower under application of N₁₀₀P₅₀K₅₀. Actual balance of N in postharvest soil was positive in plots fertilized with 100% RDF (N₈₀P₄₀K₄₀) and P and K-omitted plots. There was actual gain of P status of post-harvest soil in all the treatments, except P-omitted plots. However, the actual balance of K was negative irrespective of treatments.

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