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The existence of weeds and low efficiency of nitrogen fertilization are obstacles in the sustainable production of sweet corn. Eco-friendly weed control efforts are needed and at the same time can increase the efficiency of nitrogen fertilization in sweet corn crops. The utilisation of  Mikania micrantha  weed extract as bio-herbicide has been shown to inhibit the growth of several types of weeds. This study aimed to determine the effect of decreasing of Nitrogen dosage and the application of  Mikania micrantha  extract to reduce weed populations, support growth and yield of sweet corn crops. The research was conducted at Experimental Farm of Agriculture Faculty Universitas Jenderal Soedirman in Purwokerto Central Java from June to August 2018. The experiment used completely randomized block design. The treatments consisted of two factors and three replication. The first factor is nitrogen dosage (N1 = 100%, N2 = 50% and N3 25% N recommendation dosage) and second factor is concentration of weed extract (W1=10%, W2=20% and W3 = 30 %) The results showed that dominant weeds were  Cynodon dactylon  and  Cyperus rotundus . N dosage of 25% and 50% are able to provide the best sweet corn yield, weed extract concentrations of 10% and 20% suppress weed growth

Application of N fertilizer and Mikania micrantha weed extract on weeds population, growth and yield of sweet corn (Zea mays zacharrata)