This study aims to determine the effect of the concentration of AB Mix nutrients on the growth and yield of pakcoy plants. This research has been carried out at the agronet house of the Faculty of Agriculture, Panji Sakti University at an altitude of 39 m above sea level (above sea level), in March-May 2019. The experimental design used a single randomized block design (RCBD), namely the concentration of the AB Mix nutrition treatment ( K). Statistical analysis showed that AB Mix nutrient concentration had a very significant effect (p <0.01) on plant height at 14 days after planting, 21 days after planting, 28 days after planting, total wet weight per plant, leaf area per plant, and economic fresh weight per plant. The nutrient concentration of AB Mix 1.2% provides the best growth and yield of pakcoy plants. The higher concentration of AB Mix nutrition given causes the total wet weight per plant to change quadratically Ŷ = -137.83x2 + 325.54x - 88.997 with the coefficient of determination (R2) = 1 so that the optimum concentration = 1.18% and wet weight is obtained maximum total planting = 103,226 grams.Keywords: hydroponics, AB Mix nutrition, pakcoy Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi nutrisi AB Mix terhadap pertumbuhan dan hasil tanaman pakcoy. Penelitian ini telah dilaksanakan di rumah agronet Fakultas Pertanian Universitas Panji Sakti pada ketinggian tempat 39 m dpl (dari atas permukaan laut), pada bulan Maret -Mei 2019. Rancangan percobaan menggunakan rancangan acak kelompok (RAK) faktor tunggal yaitu perlakuan konsentrasi nutrisi AB Mix (K). Hasil analisis staistik menunjukkan konsentrasi nutrisi AB Mix berpengaruh sangat nyata (p<0,01) terhadap tinggi tanaman pada umur 14 hst, 21 hst, 28 hst, 35 hst, berat basah total per tanaman, luas daun per tanaman, dan berat segar ekonomis per tanaman. Konsentrasi nutrisi AB Mix 1,2% memberikan pertumbuhan dan hasil tanaman pakcoy terbaik. Semakin tinggi konsentrasi nutrisi AB Mix yang diberikan menyebabkan berat basah total per tanaman berubah secara kuadratik yaitu Ŷ= -137,83x2 + 325,54x - 88,997 dengan koefisien determinasi (R2) = 1 sehingga diperoleh konsentrasi optimum = 1,18% dan berat basah total pertanaman maksimum =103,226 gram.Kata kunci: hidroponik, nutrisi AB Mix, pakcoy