Penelitian ini bertujuan untuk mengetahui pengaruh jarak tanam dan jumlah bibit perlubang tanam terhadap pertumbuhan tanaman sorgum (Sorghum bicolor L.) pada lahan pesisir. Sorgum merupakan tanaman serealia yang memiliki toleransi tinggi terhadap kondisi lingkungan ekstrem seperti kekeringan dan tanah marginal, sehingga cocok dibudidayakan di wilayah pesisir. Penelitian dilaksanakan pada bulan Maret - September 2023 di lahan percobaan Fakultas Pertanian Universitas Borneo Tarakan, menggunakan Rancangan Acak Kelompok (RAK) dengan dua faktor, yaitu jarak tanam (40×20 cm, 50×20 cm, 60×20 cm, dan 70x20 cm) dan jumlah bibit perlubang tanam (1, 2, dan 3 bibit), masing-masing diulang tiga kali. Parameter pengamatan meliputi tinggi tanaman, jumlah daun, panjang daun. dan lebar daun pada umur 1, 2, dan 3 MST (minggu setelah tanam). Data dianalisis menggunakan ANOVA dan dilanjutkan dengan uji Duncan Multiple Range Test (DMRT) pada taraf 5%. Hasil penelitian menunjukkan bahwa baik perlakuan tunggal maupun kombinasi jarak tanam dan jumlah bibit tidak memberikan pengaruh yang nyata terhadap seluruh parameter pertumbuhan yang diamati. Namun secara deskriptif, perlakuan dua bibit perlubang tanam (B2) dan jarak tanam 40 cm x 20 cm (J1) serta 60 cm x 20 cm (J3) cenderung menghasilkan nilai pertumbuhan lebih tinggi dibandingkan perlakuan lainnya. Dengan demikian, meskipun tidak signifikan secara statistik, penggunaan dua bibit per lubang tanam dan jarak tanam 40 cm x 20 cm serta jarak tanam 60 cm x 20 cm berpotensi memberikan pertumbuhan tanaman sorgum yang lebih baik pada lahan pesisir.

Kata kunci: Sorgum, jarak tanam, jumlah bibit, pertumbuhan tanaman, lahan pesisir

This study aims to determine the effect of plant spacing and the number of seeds per planting hole on the growth of sorghum plants (Sorghum bicolor L.) on coastal land. Sorghum is a cereal crop that has high tolerance to extreme environmental conditions such as drought and marginal soils, making it suitable for cultivation in coastal areas. The research was conducted in March-September 2023 on the experimental land of the Faculty of Agriculture, University of Borneo Tarakan, using a Randomized Group Design (RGD) with two factors, namely planting spacing ( 40 * 20 cm, 50×20 cm, 60 * 20 cm, and 70 * 20 cm) and the number of seeds per planting hole (1, 2, and 3 seeds), each repeated three times. Observation parameters included plant height, number of leaves, leaf length, and leaf width at 1, 2, and 3 weeks after planting. Data were analyzed using ANOVA and continued with Duncan Multiple Range Test (DMRT) at the 5% level. The results showed that neither the single treatment nor the combination of planting space and number of seeds had a significant effect on all observed growth parameters. However, descriptively, the treatment of two seeds per planting hole (B2) and plant spacing of 40cm * 20 cm (J1) and 60cm * 20 cm (J3) tended to produce higher growth values than other treatments. Thus, although it was not statistically significant, the use of two seeds per planting hole and a planting space of 40cm * 20 cm and a planting space of 60cm * 20 cm had the potential to provide better growth of sorghum plants on coastal land. Keywords: Sorghum, planting space, number of seeds, plant growth, coastal land