The main objectives of this study were to determine and analyze energy use efficiency in sugar beet production, and to make cost-benefit analysis in Guneid area - Sudan. An experiment was carried out using three tillage implements (disc plough, disc harrow and ridger) for land preparation, seven days irrigation interval and mechanical planter. The treatments were replicated four times in a completely randomized block design. The results showed that total energy consumption in sugar beet production was 35099.20MJha-1, out of which 52.33% of fertilizer energy, 18.0% water energy and 9.0% of diesel energy. The energy use ratio was 28.71 and energy productivity was 1.71kgMJha-1. The results also showed that 73.6% of total energy input was in non-renewable energy form, and only 26.4% was in renewable form, while 34.1% was in from of direct energy and 65.9% indirect energy. Cost-Benefit analyses showed that the total return, net return, benefit–cost ratio and productivity of crop were 2689.6 US$ha-1, 990.8 US$ha-1, 1.58. and 35.3kgUSD-1 respectively. Although large amounts of energy consumption for sugar beet production increased the yield, it also caused in problems related to environmental pollution, land degradation, nutrient loading and pesticide toxicity. Therefore, it is important to look for methods and systems that can reduce the negative effect of high energy inputs and to develop more efficient, economical and environmentally friendly agricultural production systems that increase energy use efficiency and crop yield.

The present research was carried out at Guneid Sugar Cane Research Center during two successive seasons 2013/14 and 2014/15. The objective was to investigate the effect of four tillage systems (moldboard ploughing (T1), disc ploughing (T2), chisel ploughing (T3) and disc harrowing (T4)), three irrigation intervals (7, 10, and 14 days) and twoplanting methods (manual and mechanical) on sugar beet production. The parameters measured were machinery performance as effective field capacity (EFC), field efficiency (FE) and Fuel consumption (FC), some soil parameters (soil moisture content and bulk density), some crop parameters (root thickness (RT), crop root yield (RY), polarization or sugar content (Pol %), total sugar production (TSP) and cost of production. A spilt -split plot design with four replications was used inthis study. The results showed that all machine performance parameters measured were significantly different and the highest EFC, FE and FC were recorded by the planter, ridger and chisel machines respectively.Tillage treatments and irrigation intervals interaction insignificantly affected soil moisture content and significantly (P≤0.01) affected soil bulk density. The highest values of RT (38.6 cm), RY (31.9 t/fed), Pol % (19.9%) and TSP (4.9 t/fed) was recorded by (T3×M2×I1), (T2×M1×I2), (T4×M2×I3) and (T2×M1×I1) treatments respectively. The highest (4280 SDG/fed) and lowest (3290 SDG/fed) total cost of production was  recorded by (T1×M1×I1) and (T4×M2×I4) treatments respectively. It can be concluded that generally disc ploughing with 10 days irrigation intervaland manual planting can give higher crop root yield, higher TSP and lower cost of production at Guneid Sugar Cane Research Center