Response of grass mixtures with white clover cultivars to mineral and organic fertilization
Romuald Dembek
biuro.dziekana.wrib@pbs.edu.plZakład Łąkarstwa, Akademia Techniczno-Rolnicza im. J.J. Śniadeckich, Bydgoszcz (Poland)
Abstract
The influence of white clover cultivars (Arta and Rawo) on yielding and quality of grass-clover swards fertilized only with mineral forms of PK and NPK as well as NPK mineral fertilizer supplemented with manure was studied in 1999–2001. Grass-clover swards were compared to grass sward. On shallow and strongly mineralized organogenic soils the restricting factor for both cultivars of white clover was the lack of rainfall. In favorable moisture conditions the percentage of clovers in the sward has exceeded its percentage in the sowing mixture. The mixture with the Arta cv. and with the Ravo cv. fertilized only with phosphorus and potassium yielded respectively by 0.65 and by 0.89 t·ha-1 higher than the grass mixtures. The grass-clover and grass mixtures fertilized additionally with ammonium nitrate (120 kg N·ha-1) and nitrate supplemented with manure (all together also 120 kg N·ha-1) yielded better than that fertilized with phosphorus and potassium. Because of the manure, the grass sward in which white clover has spontaneously emerged, yielded slightly higher than mixture with Arta culivar. The weighted averages of crude protein content of grass-clover sward fertilized with phosphorus and potassium slightly differed and were from 194 g·kg-1 in the mixture with Rawo cv. to 201 g·kg-1 in the mixture with cv. Arta. However the mixture with cv. Rawo provided higher yields of crude protein for all combinations of fertilization. The higher percentage of clover in swards and slightly higher yields indicate that the Rawo cultivar should be used in mixtures in the studied soil and climate conditions.
Keywords:
białko ogółem, koniczyna biała, mieszanki, odmiany, plonyReferences
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Authors
Romuald Dembekbiuro.dziekana.wrib@pbs.edu.pl
Zakład Łąkarstwa, Akademia Techniczno-Rolnicza im. J.J. Śniadeckich, Bydgoszcz Poland
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