Electronic Theses and Dissertation

Ubi jalar (ipomoea batatas l.) merupakan salah satu komoditas tanaman pangan dari kelompok umbi-umbian yang berperan sebagai sumber karbohidrat. salah satu upaya untuk menjaga kestabilan produksi ubi jalar adalah dengan penggunaan komposisi media tanam dan umur tanaman yang tepat. tujuan dari penelitian ini untuk mengetahui komposisi media tanam dan umur panen serta interaksi antara dua faktor tersebut terhadap pertumbuhan dan hasil tanaman ubi jalar. penelitian ini dilaksanakan di kebun percobaan 1, laboratorium hortikultura dan laboratorium ilmu dan teknologi benih, departemen agroteknologi, fakultas pertanian universitas syiah kuala. penelitian ini dilakukan dari bulan januari hingga juni 2026. penelitian ini menggunakan rancangan acak kelompok pola faktorial 3×3 dengan 3 ulangan. faktor pertama adalah komposisi media tanam yang terdiri atas 3 taraf yaitu kontrol (tanah), tanah + sekam bakar (3:1) dan tanah + pupuk kandang (3:1), faktor kedua adalah umur panen yang terdiri atas 3 taraf yaitu 90, 105 dan 120 hst. peubah yang diamati adalah panjang sulur, diameter batang, jumlah cabang, bobot brangkasan basah, bobot brangkasan kering, bobot umbi per tanaman, jumlah umbi per tanaman, diameter umbi, panjang umbi, kadar air umbi dan total padatan terlarut umbi. hasil penelitian menunjukkan komposisi media tanam berpengaruh sangat nyata terhadap panjang sulur umur 14, 28 dan 42 hst, jumlah cabang umur 42 hst, panjang umbi, serta berpengaruh nyata terhadap diameter batang umur 42 hst, bobot brangkasan basah dan bobot brangkasan kering. pertumbuhan dan hasil tanaman terbaik terdapat pada perlakuan komposisi media tanam tanah + pupuk kandang sapi (3:1). umur panen berpengaruh sangat nyata terhadap bobot brangkasan basah, bobot brangkasan kering, bobot umbi per tanaman, panjang umbi, diameter umbi, kadar air umbi, serta berpengaruh nyata terhadap total padatan terlarut umbi. hasil tanaman terbaik terdapat pada perlakuan umur panen 120 hst. interaksi terhadap komposisi media tanam dan umur panen berpengaruh tidak nyata terhadap peubah yang diamati.

Sweet potato (Ipomoea batatas L.) is one of the major root and tuber food crops that serves as an important source of carbohydrates. One approach to maintaining stable sweet potato production is the use of appropriate growing media composition and harvest age. This study aimed to determine the effects of growing media composition, harvest age, and the interaction between these two factors on the growth and yield of sweet potato. The experiment was conducted at Experimental Field I, the Horticulture Laboratory, and the Seed Science and Technology Laboratory, Department of Agrotechnology, Faculty of Agriculture, Universitas Syiah Kuala, from January to June 2026. The experiment employed a factorial Randomized Complete Block Design (RCBD) with two factors and three replications. The first factor was growing media composition, consisting of three levels: soil (control), soil + rice husk charcoal (3:1), and soil + cow manure (3:1). The second factor was harvest age, consisting of three levels: 90, 105, and 120 days after planting (DAP). The observed variables included vine length, stem diameter, number of branches, fresh shoot biomass, dry shoot biomass, tuber weight per plant, number of tubers per plant, tuber diameter, tuber length, tuber moisture content, and total soluble solids (TSS). The results showed that growing media composition had a highly significant effect on vine length at 14, 28, and 42 DAP, the number of branches at 42 DAP, and tuber length, and a significant effect on stem diameter at 42 DAP, fresh shoot biomass, and dry shoot biomass. The best growth and yield were obtained from the soil + cow manure (3:1) growing medium. Harvest age had a highly significant effect on fresh shoot biomass, dry shoot biomass, tuber weight per plant, tuber length, tuber diameter, tuber moisture content, and a significant effect on total soluble solids. The highest yield was obtained at the harvest age of 120 DAP. The interaction between growing media composition and harvest age had no significant effect on any of the observed variables.