sembiring, julian, et al. “The Effect Of Gutter Slope On The Growth Of Caisim (Brassica Chinensis L Var. Parachinensis) Plants Using The Nft (Nutrient Film Technique) Hydroponic System”. Jurnal Teknologi Pertanian (Agricultural Technology Journal), vol. 16, no. 2, Jan. 2026, pp. 143-9, doi:10.35791/jteta.v16i2.66039.