TITLE:
Effects of Calcium and Magnesium on Phosphorus Availability in Ferralsols and Rice Production in Forest Zones of Côte d’Ivoire
AUTHORS:
Guy Fernand Yao, Brahima Kone, Kouadio Amani, Franck Michaël Lemonou Bahan, Jean Lopez Essehi, Brou Kouame, François Lompo, Albert Yao-Kouame
KEYWORDS:
Soil Acidity, Native and Exogenous Phosphorus, Free Iron, Ca/Mg Balances, Rice Growing, Côte d’Ivoire
JOURNAL NAME:
Journal of Agricultural Chemistry and Environment,
Vol.13 No.1,
January
29,
2024
ABSTRACT: Phosphorus bioavailability has long been a recurring problem in tropical acid soils. A pot experiment was carried out during three (3) successive rice production cycles at Adiopodoumé to evaluate the response of the NERICA 5 rice accession to various doses of calcium, magnesium and phosphorous. The experiment was conducted using a randomized split-plot design. The interactive effects of calcium carbonate (0, 25, 50 and 75 kg·Ca·ha-1) and magnesium sulfate (0, 25, 50 and 75 kg·Mg·ha-1) and Togo natural phosphate (0, 25, 50 and 75 kg·P·ha-1) were determined at each production cycle. The results showed that single-dose natural phosphate supplementation for three cropping cycles resulted in an average enrichment of around 2 mg·P·kg-1 after each trial following its continuous dissolution, with an increase in DSP (33.31% to 70.52%). The study revealed one strategy for managing and enhancing native P with cations and another for exogenous P: there would be a synergy of Ca/Mg on native P, whereas an antagonism would characterize the two parameters in phosphate fertilization.