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Alum split applications strengthened phosphorus fixation and phosphate sorption in high legacy phosphorus calcareous soil

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Journal of Environmental Sciences 2021年第3期33卷 87-97页

作者： Bingqian Fan Owen Fenton Karen Daly Jiahui Ding Shuo Chen Qing Chen Beijing Key Laboratory of Farmyard Soil Pollution Prevention-control and Remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Teagasc Environmental Research CentreJohnstown CastleCo.WexfordIreland

high phosphorus(P)saturation arising from historic P inputs to protected vegetable fields(PVFs)drives high P mobilisation to *** of soils with alum has shown potential in terms of fixing labile P and protecting water *** present 15 month pot experiment investigated P stabilisation across single alum application(Alum-1 treatment,20 g alum/kg soil incorporated into soil before the maize was sown),alum split applications(Alum-4 treatment,5 g alum/kg soil incorporated into soil before each crop was sown i.e.4×5 g/kg)and soil only treatment(Control).Results showed that the Alum-1 treatment caused the strongest stabilisation of soil labile P after maize plant removal,whereas the P stabilisation effect was gradually weakened due to the transformation of soil non-labile P to labile P and the reduced active Al^(3+)in soil *** the Alum-4 treatment,soil labile P decreased gradually with each crop planting and was lower than the Alum-1 treatment at the end of the final crop removal,without any impairment on plant *** better P stabilisation at the end of Alum-4 treatment was closely correlated with a progressive supply of Al^(3+)and a gradual decrease of pH,which resulted in higher contents of poorlycrystalline Al,Fe and exchangeable *** aspects were conducive to increasing the soil P stabilisation and phosphate *** terms of management,growers in continuous cropping systems could utilise split alum applications as a strategy to alleviate P losses in high-P enriched calcareous soil.

关键词： high legacy phosphorus Calcareous soil phosphorus stabilisation Alum split applications Non-crystalline Fe/Al

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