Abstract
In greenhouse experiments, the utilization of fertilizer phosphorus by crops grown on calcareous soils decreased in the order of buckwheat > rape >> oats > flax. Mixing monopotassium phosphate with a portion of the soil compared with adding this source as a single pellet increased the availability of fertilizer phosphorus to oats and flax. In contrast, mixing the phosphorus source with the soil either had no effect or lessened the availability of fertilizer phosphorus to rape and buckwheat. Availability of phosphorus from carriers, when added as pellets, decreased in the order dipotassium phosphate > monopotassium phosphate > dicalcium phosphate dihydrate for oats and flax and dipotassium phosphate = monopotassium phosphate > dicalcium phosphate dihydrate for buckwheat and rape.It is suggested that both the quantity of roots in the fertilizer reaction zone and the efficiency of roots in absorbing phosphorus are important factors in the ability of plants to absorb fertilizer phosphorus.
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