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The growth of weeds among agricultural crops is a pest that can decrease agricultural production by 47-87%. The aims of this research is to compare organic and an organic fertilizer and compare mechanical and chemical weed and pest control. This research employed a mixed-method, observation, in-depth interviews, and life cycle assessment. The greenhouse gas emissions were released are organic fertilizer 1,87 x 10 -3  kg CO 2  eq/ha and an organic fertilizer 15 x 10 1  kg CO 2  eq/ha. Thereafter greenhouse gas emissions were released from mechanical control 1,87 x 10 -3  kg CO 2  eq/ha and chemical control 4,4 x 10 1  kg CO 2  eq/ha. The totally of greenhouse gas emissions was released from dryland paddy farming in management phase is 19,4 x 10 1  kg CO 2  eq/ha. Organic fertilizer more friendly than an organic fertilizer and mechanical control more friendly than chemical control. Mechanical control by farmers must be modified for the increase of effectiveness. The post-mechanical control should be those containing fruit and seed must be burned, meaning there will be not a longer any weed growth potential. Therefore, this mechanism will be able to realize potential production and sustainable dryland paddy farming.

Life cycle assessment of dryland paddy farming in Ngadirojo District, Pacitan