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Handout - K+S Aktiengesellschaft

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<strong>K+S</strong> Group<br />

Strong Impact on Soybean Yield<br />

under Continued Elimination of Potash<br />

Grain yield (kg/ha)<br />

3500<br />

3000<br />

• Regular potash application of<br />

approx. 80 kg/ha of K 2 O in 5<br />

years before trial in Brazil<br />

2500<br />

2000<br />

• Climate conditions can cause<br />

volatility in yield<br />

1500<br />

1000<br />

500<br />

3,135 2,965 2,223 2,214<br />

(-5%) (-29%) (-29%)<br />

last yield<br />

with K<br />

Year 1<br />

without K<br />

Year 2<br />

without K<br />

Year 3<br />

without K<br />

772 (-75%)<br />

Year 4<br />

without K<br />

Year 5<br />

without K<br />

830 (-74%)<br />

Years of cultivation under declining K effect<br />

Source: Borkert, C.M., et al. 2005, Potash in soybean crop. In: Potassium in Brazilian agriculture, eds. T. Yamada and T.L. Roberts, 671-722. Piracicaba,<br />

Brazil: Potafos. (In Portugese); Embrapa Soybean, IPNI, personal correspondence with Paul E. Fixen, Ph.D., Dr. Adilson de Oliveira Junior, Dr. Luís I.<br />

Prochnow; The experiment took place in Ponta Grossa, Paraná, Brasil; Soil classification: Oxysol, clayed texture (clay content = 38%)<br />

January 2013<br />

<strong>K+S</strong> Group<br />

80

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