摘要 : Field experiments were carried out during kharif 2005 and summer 2006 to know the influence of crop establishment techniques and sources of nitrogen on water use efficiency, energetics and economics of rice. The SRI establishment,... 展开 Field experiments were carried out during kharif 2005 and summer 2006 to know the influence of crop establishment techniques and sources of nitrogen on water use efficiency, energetics and economics of rice. The SRI establishment, technique recorded significantly higher grain yield (10169, 10492 and 10331 kg/ha), water use efficiency (65.26, 64.49 and 64.87 kg/ha-cm), energy output : input ratio (19.57, 18.10 and 18.84), gross income (Rs. 65551, 68598 and 67575/ha) and B:C ratio (2.54, 268 and 2.61) in kharif, summer and pooled analysis, respectively, compared to transplanting and aerobic techniques. Among the sources of nitrogen, application of large sized urea granules recorded higher grain yield (9084, 9374 and 9228 kg/ha), water use efficiency (60.11, 58.01 and 59.06 kg/ha-cm), energy output; input ratio (17.68, 16.37 and 17.03), gross income (Rs. 59515, 61365 and 60440/ha) and B:C ratio (2.44, 2.64 and 2.54) as compared to application of urea, 17 : 17 : 17 (complex) and ammonium sulphate. 收起