Effect of Phosphorus Levels and Bio-organics on Yield and Nutrient Uptake of Rice Variety ADT- 43

Abstract

A field experiment was conducted in 2017 to evaluate the effects of varying phosphorus levels and bio-organic amendments on the yield performance and nutrient uptake of the rice variety ADT-43 in India. Rice productivity is often constrained by limited phosphorus availability and inefficient nutrient management practices. Although chemical fertilizers are widely used to address nutrient deficiencies, their long-term use poses environmental concerns and economic challenges. In this context, bio-organic inputs such as green manure and phosphate-solubilizing bacteria (PSB) have gained attention as sustainable alternatives for improving nutrient availability and enhancing crop productivity. The results of the study demonstrated a significant increase in both grain and straw yields, as well as improved uptake of nitrogen, phosphorus, and potassium (68.86, 10.87, and 22.66 kg ha⁻¹, respectively), following the application of phosphorus, bio-organics, or their combination, compared to the untreated control. The percentage increase in grain and straw yield ranged from 5% to 26% and 23% to 40%, respectively. Yield values varied notably across treatments, with maximum grain and straw yields of 4279 kg ha⁻¹ and 6540 kg ha⁻¹, respectively, recorded under the combined application of 100% phosphorus (50 kg P₂O₅ ha⁻¹), green manure at 6.25 t ha⁻¹, and PSB. However, the study did not specify statistical significance thresholds such as p-values or confidence intervals, which are essential for validating the reliability and reproducibility of the reported differences.