Chlorophyll concentration (SPAD values) in leaves of cocksfoot (Dactylis glomerata L.) as indicator of nitrogen concentration and production of grassland
2000
Gaborcik, N. (Vyskumny Ustav Travnych Porastov a Horskeho Polnohospodarstva, Banska Bystrica (Slovak Republic))
A study was carried out to examine the effects of increasing rates of nitrogen (0.90 and 180 kg N/ha) on the concentrations of chlorophyll, a + b (SPAD values) and nitrogen in the leaves of cocksfoot (Dactylis glomerata L.), which is part of seminatural grassland (association Poo-Trisetum) and temporary sward (grass-clover mixture). Research was carried out at the site of Sucha dolina (an altitude of 460 m above sea level) over four years (1995-1998). At the same time, the impact of the application of phosphorus and potassium fertilizers (P30 and K60 kg/ha) on the above parameters and dry matter (DM) yield in both grassland types was studied. In comparison with control (NO), the mean content of chlorophyll, a + b (SPAD) increased from 44.4 to 45.2 and 49.6 in the permanent grasland and from 38.9 to 44.8 and 48.) in the temporary sward at the treatments of N90 and N180, respectively. A close relationship between N content and SPAD readings of cocksfoot leaves was observed for the individual types of grassland under investigation (r=0.869++ and r=0.854++) as well as for both of them (r=0.964++). It was confirmed that SPAD values for these grass species are highly dependent on a level of nitrogen fertilization, correlating with DM yield of both grassland types (r=0.964++). The application of phosphorus and potassium reduced the mean SPAD value and N content by 8.2 and 0.7%, respectively. There is a discussion about the possibility of using a chlorophyll meter to determine a level of nitrogen application and predict N concentration for grass leaves and DM yield of a grassland
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