Impacts of Planting Density on Nutrients Uptake by System of Rice Intensification under No-tillage Paddy in Korea

Abstract

The first two authors equally contributed to this work The System of Rice Intensification (SRI) is a new concept of increasing the yield of rice produced in farming. Therefore, we investigated the impacts of planting density on nutrient uptake as affected by SRI under no-till cropping system. The field was prepared as a randomized complete block design with three treatments: 10×10 cm, 20×20 cm and 30×30 cm planting densities. The root dry mass was significantly increased in the wider planting densities (p<0.05%). The highest grain yield was obtained in 20×20 cm planting density plot (p<0.05%) due to higher plant density per unit area and spikelets number per panicle. The total uptake amounts by rice plant were significantly higher in 20×20 cm planting density plot as 94.8 kg ha-1 for T-N and 29.9 kg ha-1 for P than other planting densities plots, but K and Mg uptake were significantly higher in 10×10 cm planting density plot (p<0.05%). In this study, our findings suggest that SRI should be considered as a new practice for the rice productivity.