Influence of various nitrogenous fertilizers on availability of phosphate
1928
Fudge, J.F.
The influence of different sources of nitrogen on the availability of phosphate in soils from plats of the sources of nitrogen experiments of the Alabama, Rhode Island, and New Jersey Experiment Stations has been studied by the following methods: (a) Concentration of inorganic and total phosphates in the displaced solution. (b) Concentration of inorganic and total phosphates in 1:5 water extracts. (c) Concentration of inorganic phosphate in 1:5 carbonic acid extracts. In addition, the soils from the New Jersey Experiment Station were studied by other methods, as follows: (a) Amount of inorganic phosphate removed from the soils by continued leaching. (b) Amount of phosphate absorbed by the soils from a solution of mono-potassium phosphate. (c) Amount of phosphate removed from the soil by, wheat seedlings, using the Neubauer method. All methods have shown that physiologically basic nitrogen fertilizers increase and acid-forming fertilizers decrease phosphate availability, as compared with the check plats, when lime is not applied. Liming greatly increased the availability of the phosphate on all plats, and corrected the detrimental effects of the acid-forming nitrogenous fertilizers.
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