The incorrect use of fertilizers is the basis for many plant diseases, including chestnut, and few studies have been developed on chestnut nutrient needs when grown for intensive fruit production. Diagnostic methods concerning chlorophyll fluorescence and content have proven to be effective immediate and non-destructive means to detect biotic or abiotic stress which influence the plant sanitary status, and can integrate data coming from the salinity of a soil or a substrate. In this study, these agricultural parameters will be used to define the proper amount of fertilizer for chestnut cultivation during the first stages of vegetative growth. Five different amounts of a mineral fertiliser have been applied on clonal rootstocks and compared to untreated control T1 (T2, 2 g/plant; T3, 4 g/plant; T4, 6 g/plant; T5, 8 g/plant and T6, 10 g/plant). The theoretical optimum was estimated from the concentration of mineral elements in leaves, branches and roots, and turned out to be 4 g of fertiliser per plant (T3). A slow-release complex NPK fertiliser (15-9-15) has been used, mixed in the growing media (1:1 peat/pine bark ratio) at transplanting. Six month cuttings of an Euro-Japanese hybrid rootstock have been utilised, transplanted in pre-compressed peat pot of 8 cm of diameter. Substrate salinity, chlorophyll fluorescence, rate of leaves chlorophyll and morphologic parameters have been measured to define the optimal amount of fertiliser on the basis of the physiological response. Moreover, T3 and T4 have been tested in two different growth environments: heated greenhouse with fixed temperature (26°C) and growth-room (12 hours of illumination at 25°C).
Definizione della dose ottimale di fertilizzante su castagno utilizzando strumenti non distruttivi e routinari per la misurazione del contenuto di clorofilla e fluorescenza fogliare
Giovanni Gamba
;Dario Donno;Maria Gabriella Mellano;Gabriele Loris Beccaro
2020-01-01
Abstract
The incorrect use of fertilizers is the basis for many plant diseases, including chestnut, and few studies have been developed on chestnut nutrient needs when grown for intensive fruit production. Diagnostic methods concerning chlorophyll fluorescence and content have proven to be effective immediate and non-destructive means to detect biotic or abiotic stress which influence the plant sanitary status, and can integrate data coming from the salinity of a soil or a substrate. In this study, these agricultural parameters will be used to define the proper amount of fertilizer for chestnut cultivation during the first stages of vegetative growth. Five different amounts of a mineral fertiliser have been applied on clonal rootstocks and compared to untreated control T1 (T2, 2 g/plant; T3, 4 g/plant; T4, 6 g/plant; T5, 8 g/plant and T6, 10 g/plant). The theoretical optimum was estimated from the concentration of mineral elements in leaves, branches and roots, and turned out to be 4 g of fertiliser per plant (T3). A slow-release complex NPK fertiliser (15-9-15) has been used, mixed in the growing media (1:1 peat/pine bark ratio) at transplanting. Six month cuttings of an Euro-Japanese hybrid rootstock have been utilised, transplanted in pre-compressed peat pot of 8 cm of diameter. Substrate salinity, chlorophyll fluorescence, rate of leaves chlorophyll and morphologic parameters have been measured to define the optimal amount of fertiliser on the basis of the physiological response. Moreover, T3 and T4 have been tested in two different growth environments: heated greenhouse with fixed temperature (26°C) and growth-room (12 hours of illumination at 25°C).
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