Abstract
Fertilizer is one of the determining factors for the success of potato cultivation. Various types of fertilizers have been produced, but those that are suitable for regional conditions in North Sulawesi do not yet exist. The decreasing of potato production in North Sulawesi is due to the limited use of quality and certified seeds, as well as inappropriate fertilizer dosages. This research objective was to see the effect of NPK fertilization on the production of Medians potato plants. The research was conducted from August to December 2020, in Rurukan Village, East Tomohon District, Tomohon City, North Sulawesi. The experimental design used was randomized complete block design (RCBD) with seven treatments, namely the NPK fertilizer dosage of 0 kg ha-1 (P0), 150 kg ha-1 (P1), 300 kg ha-1 (P2), 450 kg ha-1 (P3), 600 kg ha-1 (P4), 750 kg ha-1 (P5) and 900 kg ha-1 (P6). Each treatment was repeated three times and resulting in 21 treatment plots. The results showed that application of NPK fertilizer of 450 kg ha-1 resulted the highest yields on the components of weight of fresh plant, tuber diameter, and potato productivity.
Highlights
Potato productivity in North Sulawesi is relatively low compared to its potential yield
According to the data of Statistics Indonesia (BPS) in 2020, average potato productivity in North Sulawesi is about 10-15 tons ha-1 [1], on the other hand based on research results of Vegetable Research Centre (Balitsa) in 2018, the potential yield could reach 30-50 tons ha-1
The research objective was to determine the effect of NPK fertilizer dosage on Median potato production
Summary
Potato productivity in North Sulawesi is relatively low compared to its potential yield. Some result studies shows that low potato productivity caused by farmers 'poor farming techniques, limited of fertilizer application and the use of inferior seeds [4,5]. Potato productivity could be increased by improving cultivation systems, through the application of appropriate and balanced fertilization and the use of superior varieties. According to Kiloes and Puspitasari (2016) [7], the Medians potato is a variety that tolerant of late blight, bacterial and viral wilt, and has good adaptability to tropical climates This variety is suitable to be developed in Indonesia, especially in North Sulawesi. NPK fertilizer (15:15:15) is one of the NPK fertilizer products that have been widely used by the farmers with a content of Nitrogen (N) 15%, Phosphorus (P2O5) 15%, Potassium (K2O) 15%, Sulfur (S) 10% , and a maximum moisture content of 2% This compound fertilizer is almost completely soluble in water, so the nutrients it contains can be absorbed effectively [11]. The research objective was to determine the effect of NPK fertilizer dosage on Median potato production
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