Effects of nitrogen and potassium fertilisers on the mineral status of perennial ryegrass (lolium perenne). I.—mineral content

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Abstract
Results are given for the effects of ammonium nitrate applied at two levels and potassium sulphate at one level on the nitrogen, calcium, magnesium, sodium, potassium, phosphorus, sulphur and chlorine content of perennial ryegrass grown pure and in the presence of clover. Three cuts were taken over two seasons and statistical analyses of the results are presented for each cut.Application of nitrogen fertilisers increased the N content of the ryegrass (chiefly the non‐protein nitrogen). Sodium contents were increased at all cuts and potassium in the second and third cuts, after application of nitrogen. Chlorine content was decreased and phosphorus increased (at second and third cuts). Variable magnesium contents were obtained, possibly due to rainfall conditions.