From Gabbro To Natural Zeolite: Exploring Laumontite And Cowlesite
November 9, 2026
A study published in Advances in Agriculture in 2026 evaluated the effects of fused calcium–magnesium phosphate fertilizer (FMP), combined with different seeding densities, on the growth and yield of OM18 rice grown on acid sulfate soil in Hậu Giang, Vietnam.
1. Study Highlights
The experimental soil had an initial pH of 3.76. In acid sulfate soils, iron (Fe) and aluminium (Al) can reduce phosphorus availability to crops.
The FMP used in the study contained 15% P₂O₅, 26% CaO, 14% MgO and 25% SiO₂.
The trial assessed different phosphorus application rates from FMP at two seeding densities: 100 and 130 kg of seed per hectare. It also included a control treatment using diammonium phosphate (DAP).
2. Key Results
The highest reported yield was 7.87 tonnes of rice per hectare. It was achieved with a seeding density of 130 kg/ha and FMP supplying 80 kg P₂O₅/ha.
The study also observed positive relationships between root biomass, plant biomass and rice yield, highlighting the importance of root development under acid sulfate soil conditions.
3. Practical Significance
The results suggest that FMP is a phosphorus source worth considering for rice cultivation on acid sulfate soils. In addition to phosphorus, it supplies calcium, magnesium and silicon, which have potential roles in plant nutrition and soil fertility management.
However, these findings come from one location, one rice variety and one growing season. The FMP and DAP treatments were not fully balanced for nutrients, so the study does not establish that FMP is superior to DAP under all conditions.
The research provides a basis for further investigation into FMP use in the Mekong Delta, particularly in acid sulfate soil areas where both nutrient management and soil health are important.
Source: Advances in Agriculture (2026), “Effects of Seeding Density and Fused Calcium Magnesium Phosphate on Rice Growth and Yield Under Acid Sulfate Soil Constraints”. DOI: 10.1155/aia/3818086
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