Impact of long-term fertiliser application and utilisation of permanent grassland on quantitative and qualitative production parameters
2007
Michalec, M., Slovak Agricultural Research Centre, Nitra (Slovak Republic) | Vargová, V., Slovak Agricultural Research Centre, Nitra (Slovak Republic) | Kováčikova, Z., Slovak Agricultural Research Centre, Nitra (Slovak Republic)
Four experiments were established in various regions in Slovakia on semi-natural grassland at altitudes ranging from 130 to 850 m a.s.l. The experimental data include 5, 10, 28 and 46-year research results. Two proportions of NPK fertilisers were monitored (1: 0.3 : 0.8 and 1: 0.15 : 0.4). The results have shown that in average of years, cuts and sites, the increased N rates of 50, 100, 150 and 200 kg.per ha at the both proportions of nutrients encourage a linear increase in dry matter (DM) production. The first proportion increased the DM production by 3, 4, 5 and 6 t per ha and the second proportion by 2, 3, 4 and 5 t per ha of DM. From the quality viewpoint, one of the most important findings is that the N rates of 50 and 100 kg per ha at the both nutrient proportions provide feed with lower content of nitrates than the non-fertilised treatments. The content of nitrates at non-fertilised sward is equivalent with swards fertilised with a rate of N 150 kg per ha at the both nutrient proportions. It was concluded that the regular utilisation of non-fertilised upland meadows over the period of 46 years promotes high production (4.8 t per ha of DM) and high quality to gain feed, and at the same time it ensures anti-erosion, retention and anti-flood protection of river areas.
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