Penelitian ini dilaksanakan karena informasi tentang tanaman pertanian hidup bersama tanaman desmodium heterophyllum belum pernah diteliti sebelumnya. penelitian ini bertujuan untuk mengetahui apakah ekstrak tanaman desmodium heterophyllum bersifat alelopati terhadap benih tanaman pertanian jenis legum dan non legum. penelitian ini menggunakan rancangan acak kelompok (rak) dengan 12 perlakuan dan 4 ulangan sehingga didapatkan 48 unit percobaan. penelitian ini menggunakan analisis anova jika terdapat perbedaan nyata pada hasil penelitian dilanjutkan dengan uji bnt (beda nyata terkecil). hasil penelitian menunjukkan bahwa tanaman desmodium heterophyllum tidak memiliki sifat alelopati terhadap benih tanaman legum yaitu kedelai, kacang hijau, kacang tanah, kacang putih, kacang merah dan kacang panjang. sedangkan tanaman desmodium heterophyllum memiliki sifat alelopati yang dapat menghambat pertumbuhan benih tanaman non-legum yaitu kangkung, sawi, bayam dan cabe rawit. kata kunci: alelopati, desmodium heterophyllum, tanaman pertanian, legum dan non legum

This study was conducted because information on crops living with desmodium heterophyllum plants has not been studied previously. this study aims to determine whether the desmodium heterophyllum plant extract is alelopati to the seeds of agricultural crops of legume and non legumes. this study used randomized block design (rak) with 12 treatments and 4 replications to obtain 48 experimental units. this research uses anova analysis if there is real difference in research result followed by bnt test (smallest real difference). the results showed that desmodium heterophyllum plants did not have allelopathic properties of leguminous plant seeds ie soybeans, green beans, peanuts, white beans, red beans and long beans. desmodium heterophyllum plants have alelopathic properties that can inhibit the growth of non-legume plants such as water spinach, mustard, spinach and cayenne pepper. keywords: alelopati, desmodium heterophyllum, agriculture plants, legum and non legum