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All Journal EUGENIA
Alen Mintalangi
Program Studi Agronomi, Fakultas Pertanian, Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry

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PENGARUH FREKUENSI PEMUPUKAN NPK PADA PERTUMBUHAN DAN PRODUKSI TANAMAN KENTANG (Solanum tuberosum L.) Alen Mintalangi; Edy Lengkong; Stella Maria Theresia Tulung; Maria Goretti Meity Polii; Antje Grace Tulungen; Yefta Pamandungan
EUGENIA Vol. 31 No. 2 (2025): Eugenia
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.v31i2.65467

Abstract

Potato (Solanum tuberosum L.) is a major horticultural crop and a key carbohydrate source after rice, maize, and wheat. Its high economic value and suitability for highland cultivation make it an important commodity for food security. This study aimed to evaluate the effect of NPK fertilization frequency on the growth and yield of the Superjohn potato variety. The experiment was conducted at the Experimental Farm of Sam Ratulangi University, Manado, from March to June 2025, using a Randomized Block Design (RBD) with four treatment frequencies: twice, three times, four times, and five times. Each treatment received a total of 15 grams of NPK per plant, applied via watering (kocor) in divided doses. Observed variables included plant height, leaf number, branch number, tuber weight, tuber count, and tuber size classes (SS, S, M, and L). Results showed that fertilization frequency had no statistically significant effect on any of the growth or yield parameters. However, the five-time application treatment (P4) consistently yielded the highest average values numerically across most variables. High rainfall during the study period was suspected to cause nutrient leaching, particularly nitrogen, and waterlogged soil conditions that inhibited root respiration and nutrient uptake. Keywords: Potato, fertilization frequency, yield
Co-Authors Antje Grace Tulungen Edy Lengkong Maria Goretti Meity Polii Stella Maria Theresia Tulung Yefta Pamandungan