Compost has some advantages, improving soil physical properties, chemical properties, and biological properties. It happens because its characteristics contain nutrients in varying types and amounts depending on the original material, provide nutrients slowly (slow release) and in limited quantities, and have the main function of improving soil fertility and health. The pile of organic waste from the Koto Baru market directly impacts the environment to their community. This Community Service Program aims to increase the knowledge and skills of target communities about processing vegetable waste from the Koto Baru market into the solid and liquid-friendly environment of organic fertilizers. The target people of this activity were PKK Jorong Subarang Nagari Koto Baru women in particular and people who wrote Jorong Subarang Nagari Koto Baru. The methods used in this service were socialization of the processing of vegetable waste from the Koto Baru market into the solid and liquid-solid and liquid friendly environment of organic fertilizers, distribution of practical manuals for assembling tools for making solid and liquid organic fertilizer from vegetable waste, distributing initial questionnaires to online socialization. This activity had positive impacts on these PKK women, including providing knowledge of PKK women about the use of organic vegetable waste from the Koto Baru market to become a POP friendly environment and POC, the dissemination of information on the use of vegetable waste from the Koto Baru market became a solid and liquid friendly environmental of organic fertilizer in Jorong Subarang Nagari Koto Baru, Tanah Datar Regency.

Tumbuhan eceng gondok yang menyebar hampir ke seluruh embung atau perairan Kayu Tanduak mengakibatkan para petani di masyarakat sepenulisr kekurangan atau kehilangan air, sehingga eceng gondok menghambat aliran irigasi sawah dan ladang. Masalah pertumbuhan eceng gondok yang pesat ini  memberikan dampak langsung kepada pendapatan hasil panen baik ladang atau sawah yang berkurang. Program Pengabdian bagi Masyarakat ini mempunyai tujuan untuk meningkatkan pengetahuan dan keterampilan masyarakat sasaran  tentang pengolahan eceng gondok menjadi biogas. Masyarakat yang menjadi sasaran pada kegiatan ini adalah Ibu-Ibu PKK Jorong Kayu Tanduak pada khususnya dan masyarakat sepenulisr Jorong Kayu Tanduak. Metode yang digunakan dalam melakukan pengabdian ini adalah (1) sosialisasi tentang pengolahan eceng gondok menjadi biogas, (2) pelatihan pembuatan alat biogas dari eceng gondok, (3) melakukan penyebaran kuisioner sebelum dan sesudah pelatihan tentang pengetahuan tentang pembuatan alat biogas dari eceng gondok. Kegiatan ini memberikan dampak positif kepada Ibu-Ibu PKK ini antara lain : (1) Peningkatan pengetahuan dan keterampilan tentang pengolahan eceng gondok menjadi biogas yang diketahui dari hasil penyebaran angket sebelum dan sesudah pelatihan, (2) tersebarnya informasi tentang pemanfaatan eceng gondok menjadi biogas dari jorong Kayu Tanduak Kabupaten Tanah Datar. Kata kunci: Eceng Gondok, Biogas, Jorong Kayu Tanduak ABSTRACT The plant of water hyacinth which spread throughout reservoir or water pool in Kayu Tanduk has made the farmers surrounding become lack or loss of water. Water hyacinth has also affected the flow of irrigation for rice fields and fields.  The rapid growth problem of water hyacinth gives direct impact to the farmers harvest income in the rice fileds and fields. This community service program (PKM) is purposed to increase the knowledge and craftsmanship for villagers and society about how to process water hyacinth into biogas.The main target community in this program is the mothers of empowering family welfare group (PKK) at Kayu Tanduak and the society of its surrounding. The methods used in this program are 1) socialization to society how to process it,2) giving training to society how to make biogas tools,3) distributing the questionnaires to society in order to see how far their undesrstanding about the water hyacinth process into biogas before training and after training.This activity give positive impacts to the mothers of empowering family welfare (PKK), they are: 1) there is an increasing of their knowledge and craftsmanship about how to process water hyacinth into biogas. It can be seen from the result of the questionnaires before and after training. 2) The spread information to society about the utilizing water hyacinth process into biogas is increased especially in the village of Kayu Tanduk Tanah Datar. Keywords: Biogas, Water hyacinth, The village of Kayu Tanduk