Maize is the second largest crop grown in Nepal and is grown in all three geographic zones. The objective of this study is to analyse the energy input-output of maize production systems. The study is conducted in Sundarharaincha municipality of Morang district, Nepal, using direct questionnaires methods for the collection of primary data of varying landholding sizes farmers. The study revealed that total energy input and output for maize production system found about 10, 999.61 MJ/ha and 45, 501.52 MJ/ha, respectively, with the highest share by farmyard manure (FYM) about 50%. The energy use efficiency was found 4.14. Total CO2, N2O and CH4 emissions due to chemical inputs were found 163.24 kg/ha, 0.03 kg/ha and 0.33 kg/ha, respectively. The total Global warming potential was found 178.58 CO2 eq. per ha. The average cost of production were calculated USD 301.35/ha and profit USD 272.26/ha.

Worldwide pressurized micro irrigation technologies have remarkably shown its effectiveness in water saving and increasing the crop yield with several other benefits. Although among the small land holder farmers, adoption of pressurized micro irrigation system is minimal mainly due to the small land holding and more system cost. Gravity micro irrigation is one of the best alternatives for the small land holder farmers with almost all benefits derived by the pressurized micro irrigation. Gravity fed drip irrigation has enormous capability for water and nutrient conservation. This review paper explains design, layout, features of gravity fed micro irrigation system, its suitability and benefits to the small farmers for achieving more yield per drop of water. The comprehensive attempt in the current review analysis is to enhance a most favourable methodology and technology to magnify and intensify the operation of gravity fed drip irrigation system in extensive cultivation and production. Further to accomplish the efficient utilization of available water resources for growing horticultural crops in hilly region of India, gravity-fed micro irrigation should be integrated with water harvesting system.