Effect of organic nutrient management on yield, nutrient uptake and nutrient balance sheet in scented rice (Oryza sativa)

Abstract

A field experiment was conducted at Ranchi during kharif seasons of 2004 and 2005, to identify suitable or- ganic nutrient management in scented rice for higher productivity, nutrient utilization and soil health. Scented rice ( Birsamati) grown with recommended inorganic fertilizer produced 20.09% higher grain yield when compared with the best organic source combination of green manuring (GM) @ 5 t/ha + FYM @ 10 t/ha (3.3 t/ha). The yield at- tributing characters also followed the trend of grain yield. Similarly, the uptake of N, P and K by rice grown with fertilizers was 31.69%, 25.98%, and 23.74% higher than GM + FYM. The maximum available N (277 kg/ha) and minimum N loss (3 kg/ha) was recorded from the plots that received GM 5 t/ha + BGA 10 kg/ha + Azotobacter @ 500 g/ha. Similarly maximum available P (24.7 kg/ha) and maximum gain in soil P (0.7 kg/ha), was recorded with the application of Karanj cake (KC) 2.5 t/ha. However, maximum available K (202 kg/ha) and maximum gain in soil K (2.0 kg/ha) was recorded from the plot receiving GM 5 t/ha + PS 10 t/ha. Among organic sources, GM + FYM fetched significantly higher net return (35, 975 Rs/ha) and B: C (2.61) when compared with rest of the or- ganic sources under test.