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1
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The effect of form and dose of nitrogen fertilizer on yielding and biological value of endive

100%
Adamczewska-Sowinska K., Milowana Uklanska C.
Acta Scientiarum Polonorum. Hortorum Cultus
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2010
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tom 09
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nr 2
Endive, like another leafy vegetables, as an annual plant with short time vegetation is prone to nitrate accumulation. The aim of research conducted in the years 2007–2009 was the assessment of the effect of diversified nitrogen doses on growth, yielding and nutritive value of two ‘Excel’ and ‘Cigal’ –endive cultivars. There were compared the effects of two kinds of fertilizer: ammonium saltpeter and Entec 26 containing DMPP nitrification inhibitor. On the basis of the results obtained it was possible to prove that ‘Excel’ endive cultivar gave marketable yield higher, average, by 19.4% as compared to Cigal cv. Significantly increased marketable yield of endive, regardless its variety, resulted from a single application of Entec 26 fertilizer, especially in the doses of 90 and 135 kg N·ha-1. The experiments also pointed to the fact that the method of fertilization, as well as nitrogen doses did considerably affect biological value of the examined endive varieties Excel cultivar characterized higher degree of nitrates accumulation and higher content of carotenoids, while Cigal cultivar featured increased content of vitamin C (average by 8.8%), dry matter and chlorophyll.
2

Evaluation of the direct and subsequent influence of a supersorbent polymer on cropping and rate of gas exchange of strawberry [Fragaria ananassa Duch.] 'Elsanta'

100%
Mikiciuk G., Mikiciuk M.
Journal of Fruit and Ornamental Plant Research
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2010
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tom 18
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nr 2
93-108
In the years 2007-2008, a pot experiment was carried out on the effect of a supersorbent polymer on cropping and rate of gas exchange of 'Elsanta' strawberry. The experiment took place in the Vegetation Hall of the West Pomeranian Techno­logical University in Szczecin and was done in a completely randomized design. The experimental factors were two doses (8 and 3.6 gdm-3) of gel polymer AgroHy- droGel, added to the medium prior to planting. Its direct (in 2007) and subsequent (in 2008) effect on the amount and quality of crops and the physiological activity of strawberry was assessed. It was found out that a larger applied dose of supersorbent caused a decrease in the strawberry yield. The differentiated doses of AgroHydroGel did not have any significant influence on the weight of an individual fruit (7.89-9.3 g) and on longitudinal (27.5-30.0 mm) and crosswise diameter (27.5-29.3 mm). Re­cordings were made of the increase in the dose of AgroHydroGel, the increase in the content of the extract and L-ascorbic acid, and the decrease in accumulation of ni­trates and nitrites, in strawberry fruit. A direct influence of the applied polymer on the increase in CO2 assimilation in strawberry leaves at the fruiting stage was ob­served. In the first year of the studies, the intensity of transpiration in the phases of fruiting and after fruiting was increased along with the increase in the doses of Agro- HydroGel, whereas in the subsequent year such a relationship was observed in the phase of flowering. The largest index of effectiveness of water use, in the photosyn­thesis in the subsequent year in all the growth phases, was characteristic of the control plants.
3

Long-term effect of different soil tillage systems on crop yield and nitrate content of soil

100%
Kismanyoky T., Hoffmann S., Toth Z.
Bibliotheca Fragmenta Agronomica
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1997
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tom 2B
4
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The effect of diverse iodine fertilization on nitrate accumulation and content of selected compounds in radish plants (Raphanus sativus L.)

75%
Strzetelski P., Smolen S., Rozek S., Sady W.
Acta Scientiarum Polonorum. Hortorum Cultus
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2010
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tom 09
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nr 2
Plant fertilization with iodine may be an alternative source of this element in human diet. Iodine influence on nitrogen metabolism in plants has not yet been thoroughly described. Thus, there is an urgent need to determine the effect of iodine application on nitrate(V) accumulation in plants. The aim of the study was to determine the influence of soil and foliar application of iodine forms (I-, IO3-) on nitrate accumulation and concentration of selected compounds in radish plants. The following treatments were applied in the experiment: 1 – control (without application of iodine), 2 – foliar application in KI form, 3 – foliar application in KIO3 form, 4 – soil fertilization in KI form, 5 – soil fertilization in KIO3 form, 6 – soil fertilization in KI form + foliar application in KI form, 7 – soil fertilization in KIO3 form + foliar application in KIO3 form. Soil fertilization with iodine was carried out before radish sowing to the level of 15 mg I·dm-3 soil. Foliar application of this element was performed twice using iodine solution in a concentration per pure element of 0.2%, in dose of 0.4 dm3· m-2. In all tested combinations with iodine treatment an increase of ammonium ion content in radish roots was observed in comparison to the control. Both, foliar nutrition with KI as well as nitrogen fertilization with KIO3 (combination 2 and 6, respectively) resulted in a significant increase of free amino acids concentration in radish roots. No significant influence of tested factors was noted for the root and leaf content of: dry mass, nitrates(V), nitrates(III) as well as root level of total soluble sugars and leaf concentration of photosynthetic pigments and ammonium ions in radish.
5

Azotany i azotyny w bulwach wczesnych odmian ziemniaka

75%
Mikos-Bielak M., Sawicka B., Rudzinska B.
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
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1999
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tom 209
137-147
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