Effect of humic acid on the yield and nutrient uptake of rice

The response of humic acid (HA) on the yield and nutrient uptake of rice (ADT-39) was study. The application of humic acid up to 20 kg ha-1 along with 100 per cent (150:50:50 NPK ha-1) recommended dose resulted in highest grain yield (4253 kg ha-1) as well as highest total uptake of nitrogen (132.0 kg ha-1), phosphorus (20.75 kg ha-1) and potassium (86.98 kg ha-1 ). The total N uptake significantly increased from 20.3 (control)) to 132.0 kg ha-1 to (100 per cent NPK + 20 kg HA ha-1). The total P and K uptake also increased from 5.82 (control) to 20.75 kg ha-1 (100% NPK + 20 kg HA) and 28.97 (control) to 86.98 kg ha-1 (100% NPK + 20 kg HA) respectively.