Ammonia‐treated vermiculite—a possible controlled‐release n‐fertiliser

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Abstract
The preparation of ammonium‐treated vermiculite containing almost 1.3 % ammonium‐N is described. The product is relatively stable on storage in air for 3 years, but during leaching with water for 20 weeks, 2.8–4.0 mm flakes released 30% of their N and 0.25–0.5 mm flakes 90%. Its potential as a controlled‐release nitrogen fertiliser is briefly discussed.