Effect of organic fertilizers on quality of grassland. 2. Content of nutrients and mineral substances, nutritive value of feed
2000
Tisliar, E. | Zimkova, M. | Citarova, E. (Vuskumny Ustav Travnych Porastov a Horskeho Polnohospodarstva, Banska Bystrica (Slovak Republic))
A small-plot field trial on permanent grassland was aimed on study the influence of three organic fertilizers (substratum of slurry with straw, safrema of mycelia and poultry dung) on nutrient and mineral concentrations of grass sward dry matter and on its nutritive value. Effects of organic fertilizers were compared with mineral fertilizers and untreated control. Two nitrogen rates were used for both organic and mineral fertilization (45 and 60 kg N/ha). At lower N-rate (45 kg N/ha), when substratum of slurry with straw, safrema of mycelia and poultry dung were applied, the crude protein content increased by 13.7, 16.9 and 12.4%. Mineral N-rate of 45 kg (in the form of NPK) increased crude protein content by 13.9% in comparison with untreated control. At higher N-rate (60 kg N/ha) crude protein increase was 16.8, 15.4, 13.9 and 19.0% in comparison with untreated control. Mineral fertilization (both 45 and 60 kg N/ha) increased the crude fibre content by 5.6%. Crude fibre of untreated control was 30 g/kg. Organic fertilizers enhanced the amount of legumes in the sward and thus phosphorus and calcium contents increased by 8.8 and 9.5%. The highest crude protein digestibility (PDI) was found at substratum of slurry with straw and at safrema of mycelia (85 g/kg of dry matter)
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