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An Evaluation of Phosphorus Fertilizers Varying in Water Solubility: III. Oat Fertilization
Author(s) -
Webb John R.,
Pesek John T.,
Eik Kalju
Publication year - 1961
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1961.03615995002500030024x
Subject(s) - soil water , solubility , fertilizer , phosphorus , calcareous , human fertilization , chemistry , agronomy , nutrient , environmental science , soil science , botany , biology , organic chemistry
Nine field experiments were conducted in which phosphorus fertilizers differing in water solubility were compared for the fertilization of spring‐seeded oats. Methods of fertilizer application were also studied in five of the experiments. The tests involved rates of 15 to 75 pounds of available P 2 O 5 per acre, and were located on soils which tested low in available P and had a pH range from 5.4 to 7.9. The reaction of the soil appeared to be the most important single factor influencing the effectiveness of P sources and their method of application. In general, the degree of P water solubility assumed most importance in the experiments located on calcareous soils, while placement effects were of greatest significance on the acid soils. In 3 of 5 experiments located on calcareous soils, there was a definite increase in yields with increasing water solubility of the P sources. However, the data were not comprehensive enough to permit the establishment of any critical level of water solubility. Drilling the fertilizer with the seed was significantly superior to broadcasting in the three experiments involving placement studies on acid soils. Phosphorus sources differed only slightly in effectiveness on these soils.