The effectiveness of different forms of phosphorus fertilizers, their influence on the phosphate regime of a derno-podzolic soil and the Ca:Mg balance in a lysimeter experiment

Smirnov, P.M.; Kulyukin, A.N.; Chernyshov, A.P.

Agrokhimiya (9): 15-20


ISSN/ISBN: 0002-1881
Accession: 001266080

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In a lysimeter experiment (1976-79) partly decomposed rock phosphate meal (28.7% P2O5) alone or mixed with red phosphorus (54.2% P2O5) had similar effects on crop yields as ammophos (54% P2O5 and 10% N) and double superphosphate (42% P2O5). Phosphorus in superphosphate and ammophos is converted to a considerable extent into sesquioxide phosphates in a derno-podzolic soil. Ca and Mg deficits over 4 years were greatest with ammophos and least with partly decomposed rock phosphate meal.