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Mar 2, 2015

Observing potassium content in grassland

Geert-Udo Stroman of the Lower Saxony Chamber of Agriculture published an article with this title, which sheds a light on research findings showing that the potassium content in cattle slurry is frequently being overestimated. Current LUFA analyses show a K2O content of 4 kg/m³ and therefore a value significantly below the reference values. Farmers must respond now.


Furthermore, the withdrawal of potassium on grassland has been increasing for several years. Example of meadow mowing: Today five instead of the former three cuttings are often being harvested, and so significantly more potassium is being removed from fields. A greater addition of the nutrient is necessary through appropriate fertilising to keep yields stable. A potassium fertilising test for grassland, carried out over a period of two years at a geest location, shows the high yield efficiency of potassium fertilising:

Potassium supply level A/B: Uniform nitrogen and phosphorus fertilising 2012/2013 Südbrookmerland; AUR, GD 5 % Ges.-TM: 24.5 dt/ha

As a result, the dry matter and energy yields increased significantly up to a treatment of 360 kg/ha K2O and confirm the fertilising recommendations. Split fertilising in the form of Korn-Kali® brought the strongest yield growth and a more favourable potassium to sodium (K/Na) ratio. Fertilising with Magnesia-Kainit® has the best influence on the K/Na ratio. Here, this is below the target value of 20:1 and therefore proves the positive effect of Magnesia-Kainit® on grassland growth and animal health.

The K:Na is positively influenced by Magnesia-Kainit®.

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