IPI International Potash Institute
IPI International Potash Institute

Scientific abstracts

Title:
Potassium Fertilization of Timothy-Based Cut Grassland - Effects on Herbage Yield, Mineral Composition and Critical K Concentration on Soils with Different K Status
Authors:
Lunnan, T., A.F. &‌Oslash;gaard, and T. Krogstad
Published in:
Grass and Forage Science 73(2):500-509 (2018), English

Abstract:

Herbage yield responses to K fertilizer application are variable in Norwegian grassland. Excessive K application may increase the risk of grass tetany (hypomagnesaemia) and milk fever (hypocalcaemia). We analysed a series of K fertilizer experiments on grassland with respect to their herbage yields and mineral composition. Our results show the importance of native soil K reserves when considering the need for K application. Soils with a high content of acid‐soluble K showed no response to K fertilizer application. The critical K content in grass with respect to yield was estimated to be 17.7 g K/kg DM in the first cut and 20.3 kg K/DM in the second cut, while the critical K/N relationship was found to be 0.83 when a maximum yield reduction of 2.5% was used as a criterion. In these trials, soils with a high content of acid‐soluble K had the greatest risk of grass tetany and the highest values of cation-anion balance. Application of potassium chloride had little effect on the cation-anion balance, and thereby the risk of milking fever, because there was a corresponding uptake of K and Cl ions.

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