Effect of pH on Leaching Losses of Potassium Applied to Forest Nursery Soils1
- H. H. Krause2
A lysimeter experiment was conducted to determine the effect of soil pH on adsorption and leaching of applied K. The experimental soil was a fine sand. The pH was adjusted to 4.3, 5.1, and 6.4. The soils of different reaction were treated at increasing rates with K2SO4 and exposed to rainfall and irrigation. Periodic collection and analysis of leachates over 1 year showed that K losses from strongly acid (pH 4.3) soil were 1.7 to 2.4 times higher than losses from moderately acid (pH 5.1) soil, and 2.5 to 3.5 times higher than losses from weakly acid (pH 6.4) soil. Seasons of greatest K leaching were late fall, early spring, and wet periods during summer.
The results show a need for an adjustment of rate and frequency of K fertilization according to pH and base saturation of individual nursery soils, and stress the importance of liming of strongly acid nursery soils.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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