Effect of chemical fertilizer applications on the yield and quality of some permanent and temporary pastures in Romania

• Published in: Lucrarile Stiintifice ale Institutului de Cercetare si Productie pentru Cultura Pajistilor (Romania) Vol. 9
• Main Authors: Cardosol, V. (Institutul de Cercetare si Productie pentru cultura Pajistilor, Brasov (Romania)), Motea, G, Barbulescu, C, Pavel, C, Simtea, N, Ionel, A, Lapusan, A, Tucra, I, Dragomir, N, Chiper, C, Capsa, I, Capsa, S, Razec, I, Panait, V, Iacob, T, Petcu, N, Dinca, F, Stefan, D
• Format: Publication
• Language: Romanian
• Published: 1988
• Subjects: CALIDAD; CONTENIDO DE MATERIA SECA; DOSE D'APPLICATION; DOSIS DE APLICACION; ENGRAIS NPK; FERTILIZANTES NPK; PASTIZAL PERMANENTE; PRADERA TEMPORAL; PRAIRIE PERMANENTE; PRAIRIE TEMPORAIRE; QUALITE; RENDEMENT DES CULTURES; RENDIMIENTO DE CULTIVOS; ROUMANIE; RUMANIA; TENEUR EN MATIERE SECHE; VARIEDADES; VARIETE

During 1977-1982 the Research and Production Institute for Grassland Cultivation, Brasov organized an experiment with 4 nitrogen rates (50, 100, 150 and 200 kg/ha N), 3 phosphorus rates (0, 50, 100 kg/ha P2O5) and 3 potassium rates (0, 50, 100 kg/ha K2O) in 12 experimental fields placed on the main grasslands existing in Romania and ranging between 125 and 1,800 m altitude. On a 6-year average nitrogen fertilizers allowed yield gains under increased rates up to 200 N in most grasslands, except for the grasslands with Festuca valesiaca at Jucu, Agrostis tenuis at Prejba, Nardus stricta at Muntele Mic and the temporary grasslands, which reacted positively only up to 150 N. Phosphorus fertilizers had a significant positive influence on dry matter yield at a rate of 50 P2O5 combined with low and moderate nitrogen rates (50-100 N), and at a rate of 100 P2O5 and high nitrogen rates (150-200 N), on a potassium background. Potassium fertilizers are not indicated for soils well supplied with potassium (Puccinellia distans and Festuca valesiaca grasslands) and for Agrostis tenuis grasslands at Soceni and Davidesti, when low rates of nitrogen and phosphorus (50 N; 50 P2O5) are used. For all the grasslands under study a rate of 50 K2O is recommended. Combined application of 150-200 N, 50-100 P2O5, 0-100 K2O, depending on grassland type, induced average yield gains (per kg of active ingredient) of 10-15 kg D.M., increased phosphorus and potassium contents in forage and soil, and maintained these contents at values superior to critical levels