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How to determine the optimum level of fertilizer. The experience of one trial



How to determine the optimum level of fertilizer. The experience of one trial



Fourrages Actualites, Supplement a l' Elevage Bovin, Ovin, Caprin (96): 13-21



In a 13-yr field trial at Aspach-le-Bas a pasture of cocksfoot Prairial was given 150-450 kg K2O and 110-500 kg N/ha in various combinations of the 2 elements, and yield and longevity of the sward were observed under simulated grazing. In the first 4 yr, grass yields increased with higher rates of N and K, reaching a max. of 12.6 t DM/ha. After this time, increasing N had no effect at low rates of K but yield reached 14.3 t DM/ha at the highest rates of K and N.

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