Növénytermelés / Volume 67 / Issue 3 (September 2018) / pp. 23-34


Effect of nitrogen nutrition on some physiological parameters of different medicinal pumpkin genotypes

Pumpkin is one of the plants that have been produced for a long time. Its significance is constantly growing, mainly due to its wide range of usability. There are many plants in the genus cucurbita, such as the Styrian pumpkin (Cucurbita pepo var. styriaca), the seed of which is referred to as the peel-less Styrian seed. This plant is a well-known medicinal plant, as well as a source of animal and human nutrients. During our work, we performed field experiments to examine the effect of nitrogen supply of different extent on the relative chlorophyll content of oil pumpkin. The randomised small plot experiment was established at the Research Institute of Nyíregyháza and measurements were performed in the summer of 2017. The three different nitrogen supply doses were applied during sowing. The relative chlorophyll content was measured both with SPAD-502 (Minolta, Japan), and handheld Greenseeker (Trimble, USA) with the intention to evaluate the usability of the measured parameters. The subject of our measurements was two different genotypes (Gleisdorf Classic and GL Rustical). Based on the relative chlorophyll content, the Gleisdorf Classic was more sensitive to reduced nitrogen supply (noN and 1/2N) than the GL Rustical. In addition, the obtained NDVI readings were also lower as a result of the performed treatments than in the case of GL Rustical. The half dose nitrogen treatment showed a slight relative change in chlorophyll content in the case of GL Rustical, i.e., based on this parameter, the production of GL Rustical is should be considered with lower dose of nitrogen replenishment. At the same time, a double dose of applied nitrogen did not increase the relative chlorophyll content any further in the case of the examined genotypes. Based on the obtained findings, both measured parameters are suitable for the characterisation of the nitrogen supply level of the peel-less oil pumpkin, similarly to other plants. There was a significant difference between genotype and the performed treatments, but further analyses are necessary to be carried out in order to verify the details of our statements, as well as to identify quality characteristics.
Keywords: Styrian pumpkin, relative chlorophyll content, nitrogen, SPAD, NDVI

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