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vol. 7, nr. 3 (2006)
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Nitrate reduction in carrot leaves in relation to foliar nutrition and different forms of nitrogen fertilizer
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Renata Wojciechowska1, Sylwester Smoleń2, Włodzimierz Sady2, Anna Kołton1
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1 Department of Plant Physiology, Faculty of Horticulture, Agricultural University, Al. 29 Listopada 54, 31-245 Krakow |
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2 Department of Soil Cultivation and Fertilization of Horticulture Plants, Faculty of Horticulture, Agricultural University, Al. 29 Listopada 54, 31-245 Krakow |
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vol. 7 (2006), nr. 3,
pp. 763-774
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abstract:
The aim of the research was to study the influence of foliar nutrition with urea and Supervit-R and different forms of nitrogen fertilizer (Ca(NO3)2, NH4NO3, (NH4)2SO4 i CO(NH2)2) introduced to the soil on nitrate metabolism in carrot leaves in comparison with this process in the roots. The object of the experiment was carrot ‘Kazan F1’ which grew during 2004-2005 in containers placed in the open. Soil fertilization with reduced forms of nitrogen and foliar nutrition caused increase of NR activity in leaves in comparison with plants without foliar nutrition. Increase of NiR activity and NO3- content and decrease of NH4+ content in carrot leaves from August (immediately before last foliar nutrition) to September (harvest time) was observed irrespectively of forms of nitrogen fertilizer. Foliar nutrition caused significant increase of NO3- content in carrot leaves and did not affect the photosynthetic pigment content. Nitrogen nutrition modified the participation of carrot leaves and roots in nitrate and nitrite reduction.
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keywords:
nitrate reductase, nitrite reductase, nitrate ions, ammonium ions, photosynthetic pigments
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original in:
Polish
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