The relationship between nitrogen dose and yielding of potato cultivars
Cezary Trawczyński
c.trawczynski@ihar.edu.plZakład Agronomii Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział Jadwisin (Poland)
Abstract
In the years 1997–2002 the field experiments were carried out under light soil conditions to determine nitrogen doses and their efficiency in growing of 38 potato cultivars. In these experiments 5 levels of nitrogen fertilization were applied: 0, 50, 100, 150 and 200 kg/ha N, at the constant levels of phosphorus 120 kg/ha P2O5 and potassium 180 kg/ha K2O. For all the cultivars maximum biological nitrogen doses and recommended doses as well as their efficiency were established. The cultivars were divided into three groups, representing low, medium and high requirement for nitrogen. The established maximum biological nitrogen doses were as follows: 112 to 138 kg/ha, 148 to 176 kg/ha and 179 to 198 kg/ha, respectively. The recommended N doses were lower by approx. 30–40 kg/ha. The maximum biological dose effected 47 to 116 kg of tubers. This yield was lower by about 10–15 kg of tubers per 1 kg of nitrogen as compared to that obtained following application of the recommended dose. Some cultivars characterized by the low requirement for nitrogen exhibited higher efficiency than cultivars of medium and high requirements.
Keywords:
efficiency of nitrogen fertilization, nitrogen doses, potato cultivars, yield of tubersReferences
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Authors
Cezary Trawczyńskic.trawczynski@ihar.edu.pl
Zakład Agronomii Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział Jadwisin Poland
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