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vol. 7, nr. 3 (2006)
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Effect of fertilization with different forms of nitrogen and foliar nutrition on yield and nitrogen metabolism in carrot roots (Daucus carota L.)
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Sylwester Smoleń1, Renata Wojciechowska2, Włodzimierz Sady1, Anna Szura1
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1 Department of Soil Cultivation and Fertilization of Horticulture Plants, Agricultural University, Al. 29 Listopada 54, 31-245 Kraków |
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2 Department of Plant Physiology, Faculty of Horticulture, Agricultural University, Al. 29 Listopada 54, 31-245 Kraków |
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vol. 7 (2006), nr. 3,
pp. 721-732
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abstract:
Carrot ‘Kazan F1’ was grown in 2004-2005 in containers 60×40×20 cm, placed in the open under a fabric shade. Medium silty clay loam (30% sand, 28% silt, 37% clay) was used as the substrate. The containers were filled with the clay soil containing on average 3.25 % of organic matter. Available mineral nutrients were supplemented to the following levels: 100 mg N, 80 mg P, 120 mg K, 80 mg Mg, 2000 mg Ca·dm-3 of soil. The research included treatments with and without foliar nutrition which was applied three times with alternate use of 2% urea, 1% Supervit R and 2% urea. Distinguished in the experiment were objects with different soil nitrogen fertilization: control (without nitrogen fertilization) and Ca(NO3)2, NH4NO3, (NH4)2SO4, CO(NH2)2. Nitrogen fertilization caused increase of single root weight, NO3- and total nitrogen content, as well as of the activity of NR and NiR in the carrot roots. Nitrogen fertilization did not significantly affect the content of dry matter in roots. Foliar nutrition caused decrease of single root weight. Plants treated by foliar nutrition had roots with higher total nitrogen content and higher NR activity. Foliar nutrition did not significantly affect the content of: dry matter, NO3-, NH4+, and activity of NiR in roots. Interaction of foliar nutrition and nitrogen fertilization significantly influenced single root weight, content of NO3- and activity of NiR while it did not affect the content of NH4+, total nitrogen, dry matter nor NR activity in carrot roots.
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keywords:
nitrogen, foliar nutrition, nitrate reductase, nitrite reductase, carrot
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original in:
Polish
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