The effect of NPK fertilization on tuber yield and starch content in potato tubers
2004
Ciecko, Z. | Zolnowski, A. | Wyszkowski, M.,Uniwersytet Warminsko-Mazurski, Olsztyn (Poland). Katedra Chemii Srodowiska
The field trial focused on three potato cultivars: Muza, Oda i Oran, which were cultivated on three mineral fertilization levels: N40P17, N80P34, N120P51. Potassium elevated rates were applied in proportion to N and P (0, 1, 2 and 3). The tuber yield of cultivars were significantly different. The highest yield was noted for Orlan - 38.34 t/ha, and significantly lower for Oda and Muza, respectively at 35.33 and 31.83 t/ha. The yielding depended on climatic conditions during vegetation period. The yields noted for 1998 and 2000 were comparable (46.65 t and 40.05 t/ha) but lower precipitations in 1999 and high temperatures during the second half of vegetation significantly reduced tuber yields to 22.21 t/ha. Increasing NP fertilization improved the tuber yield, especially for the Muza and Orlan cultivars. The starch content depended on meteorological conditions too. The highest content of starch was noted for tubers harvested in 2000 (average of 14.21 percent), followed by 1998 (13.94 percent), and 1999 (13.86 percent). The low concentration of tuber starch in 1999 caused the lowest starch yield (3.08 t/ha) compared with 1998 (6.50 t/ha) and 2000 (5.69 t/ha). The fertilization ranges from N40P17 to N120P51 significantly reduced the tuber starch content of cultivars. Increasing doses of potassium used on the three NP fertilization levels caused a lower starch content in tubers of the estimated cultivars
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