in this example the efficiency of different salts of the anionic polymer as a coating on phosphate fertilizer was evaluated polymer coatings were applied on a 1 by weight basis onto map the test crop for this experiment was corn and the polymer used was a polymer formed by b and c monomers all phosphorous treatments were banded 2 inches below and 2 inches away from the seed rows the acid in calcareous soils used in this experiment are both known to fix phosphorous fertilizer thereby limiting the growth of crops the corn was harvested at the six leaf stage and dry weights were determined as an indication as the efficiency of the coatings on phosphorous uptake and resultant corn growth results of this experiment are given below in table 2 table 2 shows that both the hydrogen and ammonium salts of the polymer were effective at increasing corn growth when combined with map the acid control untreated map produced 294 more dry matter than the control which did not include map these results illustrate that the soil is very responsive to phosphorous when the map was coated with the anionic polymer charged neutralized with hydrogen dry matter yields were increased by 41 9 the calcareous control untreated map produced 128 more dry matter than the control which did not include any map the map treated with the autonomic polymer charge.