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Impacts of phosphogypsum, soluble fertilizer and lime amendment of acid soils on the bioavailability of phosphorus and sulphur under lucerne (Medicago sativa)

Bouray, M
Moir, James
Condron, L
Lehto, Niklas
Journal Article
Fields of Research
ANZSRC::0703 Crop and Pasture Production , ANZSRC::079902 Fertilisers and Agrochemicals (incl. Application) , ANZSRC::070305 Crop and Pasture Improvement (Selection and Breeding) , ANZSRC::070204 Animal Nutrition , ANZSRC::0503 Soil Sciences , ANZSRC::30 Agricultural, veterinary and food sciences , ANZSRC::31 Biological sciences
Legumes play critical dual roles in grazed grassland ecosystems; providing nitrogen inputs and high-quality feed for grazing livestock. However, many species fail to persist in acidic, low fertility soils. A glasshouse study was conducted to investigate the response of lucerne (Medicago sativa) to phosphogypsum (PG), lime and soluble P + S fertilizer (PS) application to two soils. Phosphorus and sulphur were applied through either PG (0, 1, 3 and 9 t ha¯¹) or P + S fertilizer at equivalent rates to PG. Both PG and PS were applied with or without lime, which was applied at 2 t ha¯¹. Yield and nutrient uptake of the lucerne was measured, while the soil was analyzed for pH, Olsen P and exchangeable aluminum. Yield responses were significantly different between the two soils. Maximum yields and P and S uptakes were obtained under PG 9 t ha¯¹ combined with lime. Exchangeable Al decreased in both soils under 1 ha¯¹ of PG compared with the control. At the highest rate, Olsen P increased by 8 and 6 mg kg¯¹ for PG and by 6 and 11 mg kg¯¹ for PS compared with the control for Glenmore and Molesworth soils respectively. Phosphogypsum showed positive effects on P and S bioavailability.
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