Long-term fertilizer application on an alluvial meadow at two ratios of N:P:K
1997
Jezikova, O. | Lihan, E. (Grassland and Mountain Agriculture Research Inst., Banska Bystrica (Slovak Republic))
Results of a long-term trial (35 years) at the site of Velka Luka (altitude 350 m, Slovakia) are presented. In the 3-cut system, four nitrogen rates (50, 100, 150 and 200 kg per ha) were applied at two ratios of N:P:K (100:30:80 in treatments A and 100:15:40 in treatments B). Botanical composition of swards varied according to ground cover proportion of agrobotanical groups. Cyclic variability of species was observed. Direct drilling of competitive Dactylis glomerata proved efficient against penetration of Agropyron repens into the sward. Averaged over the 35 years, rather high dry matter yields were achieved at low variability and standard production efficiency. The higher P and K rates at unchanged N levels showed very low effects on increase of production. There were more differences in the content of mineral elements of dry matter. With the wide nutrient ratio, the content of N and Ca was higher while the P and K content was lower. Just the opposite tendency was observed at the narrow N:P:K ratio. Soil pH dropped and the decrease was lower at the wider ratio
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