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Nitrate concentration in edible parts of plants is still at the center of interest. Nitrate metabolism in plants is regulated among others by light. Therefore, the effect of LED and HPS lamps, as supplemental to solar radiation, on nitrate concentration and metabolism in Valerianella locusta ‘Nordhollandse’ was tested (in 30th and 60th day of lighting, at noon and evening hours). In two years of study,...
Obiektem badań w latach 2003-2006 była kapusta czerwona odmiany ‘Langendijker’. W nawożeniu roślin w uprawie polowej ustalono pięć kombinacji różniących się formą azotu: 1. Naturalna zawartość N w glebie (kontrola), 2. Ca(NO3)2, 3. (NH4)2SO4, 4. NH4NO3 i 5. CO(NH2)2. W pracy określono wpływ różnych form azotu zastosowanych w nawożeniu na zawartość cukrów rozpuszczalnych, suchej masy, tiocyjanianów,...
W pracy porównano wielkość i jakość plonu sześciu odmian i rodów hodowlanych kapusty głowiastej białej, w odniesieniu do odmiany standardowej ‘Marathon F1’. Kapustę uprawiano systemem łanowym w latach 2002-2004 na polu doświadczalnym firmy „Polan” w Grębałowie koło Krakowa. Jakość plonu poszczególnych odmian i rodów oceniano po zbiorze oraz po okresie czteromiesięcznego przechowywania na podstawie...
Nitrates and nitrites in natural samples are determined by ion chromatography and spec-trophotometric methods. The spectrophotometric method most often used for the determination of nitrites is the Griess-IIosvay one, based on the reaction of diazotization of the primary aromatic amines followed by coupling of diazonium salts yielding azo dye. The same method can be used for the determination of nitrates,...
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