Volume 68(2)2023 Effect of conjoint application of organic and chemical fertilizer on physiological characters, yield and economics of rice

Abstract

A field experiment was conducted during the Kharif season of 2019 and 2020  at Crop Research Centre, Sardar Vallabh Bhai Patel University of Agriculture & Technology, Modipuram, Meerut, Uttar Pradesh to study the effect of integrated use of chemical nitrogen fertilizer and green manure on performance of rice (Oryza sativa L.). The experiment was laid out in randomized block design with three replications consisting of fourteen treatment combinations of conjoint application of organic and chemical fertilizer. The result showed that the significantly highest dry matter accumulation (1205.90 g/m²) at the harvest stage, leaf area index (4.18), crop growth rate (16.34 g m-² day ^-1), relative growth rate (7.09 mg g ^-1 day ^-1), grain (38.80 t/ha) and straw yield (66.36 t/ha) were recorded in the T₅ which was statistically similar to T₂ and T₆ over rest of the treatment combinations. This practice will reduce the loss of N applied through chemical fertilizer at the time of transplanting. Thus, suggests the substitution of 25% N through dhaincha incorporated at planting date (T₅) was found most promising in terms of productivity and profitability and performed better than other treatments and may be recommended for farmers of Uttar Pradesh and similar agro-Eco regions.