Nutrient storage by andic soils
1982
STARK, N. | SPITZNER, C.
Most andic soils are fertile and support good tree growth by virtue of favorable nutrient and water availability. Western Montana has some andic soils that are low in nutrient content and, because of underlying gravels that allow excessive drainage, are droughty. Before the drought problem was recognized, the area was fertilized. These soils are deficient in Ca, Cu, K, Mg, Zn, and total N. Fertilizer added to known volumes of andic soil in Leach tubes showed that not all deficiencies can be remedied by adding the deficient ions. Adding 1000 ppm Ca made some calcium available, but released considerable Mg. Magnesium added to soil at 300 ppm released calcium from the soil. Adding potassium did not result in high levels of available potassium. Calcium and magnesium fertilizer released some manganese from andic soils. Copper in solution was nearly all available, and in some soils more copper was released than was added. Iron added to these soils increased iron availability 2.5 to 3 times in excess of what was added. Manganese fertilizer was readily retrieved with 1 N NH4OAc extractant. Zinc retrieval was poor, but phosphate retrieval with 1 N NH4F was good.
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