Krissandi Wijaya
Faculty of Agriculture, Jenderal Soedirman University (UNSOED). Jl. dr. Soeparno Karangwangkal, PO BOX 125, Purwokerto 53123

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Effect of Potassium Level on Quality traits of Indonesian Potato Tubers Wibowo, Condro; Wijaya, Krissandi; Sumartono, Gregorius Hadi; Pawelzik, Elke
Asia Pacific Journal of Sustainable Agriculture, Food and Energy Vol 2, No 1 (2014): Agriculture Food and Energy for Future
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy Network (SAFE Network)

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Abstract

The rate of K2O can affect yield and process-grade tubers of potato (Solanum tuberosum L.). The Indonesian cultivars Tenggo and Krespo were examined for effects of K2O level on selected quality traits. Both new cultivars are intended for processing purposes. The result showed that dry matter, K, Mg and Mn contents were not affected by K2O supply. Citric acid content of cultivar Tenggo increased up to 2.64 mg 100 g-1 Dry Matter due to application of 100 kg ha-1 K2O , whereas ascorbic and chlorogenic acid contents were not affected by K2O level. Malic and fumaric acid in cultivar Krespo, and tartaric and fumaric acids in cultivar Tenggo increased due to application of 100 kg ha-1 of K2O. Regarding the oxidative potential no differences between the cultivars were found.
SIMPLE PREDICTION MODEL FOR POTATO YIELD BASED ON WATER AND NUTRIENTS AVAILABILITY IN SOIL WITH DIFFERENT FERTILIZERS AND BIOCHARS APPLICATION Wijaya, Krissandi; Ardiansyah, Ardiansyah; Kuncoro, Purwoko H; Nishimura, Taku
Proceeding Seminar LPPM UMP 2015: Buku I Bidang Ilmu Ekonomi dan Pertanian, Proceeding Seminar Nasional LPPM 2015, 26 September
Publisher : Proceeding Seminar LPPM UMP

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Abstract

The yield of potato crop strongly depends on water and nutrients availability in soil, which in turn are affected by type/rate of fertilizer and soil-amendment applied. This research was aimed to develop simple prediction model for potato crop (Atlantik variety) yield based on water and nutrients availability in its growing soil (pot) with different types/rates of fertilizers and biochars. The totally 60 pots of inorganic (P1; N: 100 kg/ha, P: 300 kg/ha, K: 150 kg/ha) and organic fertilizer (P2; NPK-dosage was equalized to inorganic-NPK) in combination with zero-(A0),wood-(A1),rice-husk-(A2),and activated-charcoal (A3) having dosage of 5 ton/ha (D1), 10 ton/ha (D2), and 15 ton/ha (D3) each were prepared in a screen-house located at Serang village, Purbalingga regency, and sowed by Atlantik potato seed. For the entire treatments, the water requirement (evapotranspiration) was determined from daily weather data (temperature, relative humidity, wind-speed, and solar-radiation), while soil-nutrients contents were monthly sampled and analyzed in laboratory. The yield was then measured in each cropping-pot at harvesting time. The results showed that the yield of Atlantic potato with different types/rate of fertilizers and biochars was well predicted by a simple model, in which the errors were ranged from 0.33 – 0.77%. The organic fertilizer with wood-charcoal of 10 ton/ha gave the highest yield of Atlantic potato crop.Keywords: Simple prediction model, Atlantik potato yield, inorganic and organic fertilizer, biochars, water and nutrients availability