2001•Indian Journal of AgronomyRequires access
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
Pravat Kumar Roul, S.K. SARAWGI, G.K. Shrivastav, Deepak Kumar
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Abstract
A field study was conducted during 2000-01 and 2001-02 at the lndira Gandhi Agricultural University, Raipur, to evaluate the productivity, N uptake, N-use efficiency, economics and energetics of rice (Oryza sativa L.)-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% recom- mended dose of nitrogen (RDN) blended with FYM applied in rainy (kharif) (1 13.28 qlha) and winter (rabo seasons (102.12 qlha). 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 re- turns 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. 1 Key words: Blending, Azospirillum, Productivity, Net return, Benefit : cost ratio, Energy-use efficiency