Effect of integrated nitrogen management techniques on productivity, nitrogen uptake, N-use efficiency, economics and energetics of rice (Oryza sativa)–Indian mustard (Brassica juncea) sequence

A field study was conducted during 2000–01 and 2001–02 at the Indira Gandhi Agricultural University, Raipur, to evaluate the productivity, N uptake, N-use efficiency, economics and energetics of rice (Oryza sativaL.)–Indian mustard [Brassica juncea (L.) Czern. & Coss.] cropping system under different nitrogen management techniques. The total productivity of the cropping system in terms of rice-yield equivalent was the highest under 100% recommended dose of nitrogen (RDN) blended with FYM applied in rainy (kharif) (113.28 q/ha) and winter (rabi) seasons (102.12 q/ha). The N uptake and N-use efficiency for rice and Indian mustard crops were also higher under 100% RDN blended with FYM. Highest net returns and benefit: cost ratio were also observed under 100% RDN blended with FYM applied in rainy and also in winter season. This treatment could bring in 31.9 and 3.8% higher net returns over 100% RDN when applied in rainy season and winter season respectively. The 100% RDN belnded with FYM applied in rainy or winter season showed the higher energy output values and application of this treatment in rainy season also recorded the highest energy-use efficiency and output:input ratio. However, in winter energy-use efficiency and output: input ratio under this treatment were low.