Fertilisation with Compost: Effects on Soil Phosphorus Sorption and on Phosphorus Availability in Acid Soils

Abstract

Phosphate mineral fertilisers are manufactured from non-renewable resources. Soil fertilisation with composts is considered a good source of reuse nutrients such as phosphorus (P). The aim of this work was to evaluate the effect of compost fertilisation on soil P sorption and consequently on P availability. It was done an incubation experiment followed by a sorption experiment in a low-P acid soil fertilised with compost (CP) or single superphosphate (SSP). The P application rates were: 0, 6.5, 13, 26 and 52 (kg•P•ha −1 ). In CP treatments, the rates 26 and 52 kg•P•ha −1 were achieved by adding SSP to CP since it was not allowed to incorporate into soil more than 170 kg•N•ha −1 from organic amendments. Although SSP has a higher proportion of easily available P than CP (86% vs 50%), the results showed that after 140 days of soil incubation, the available P was higher in CP treatments compared with SSP at the same rate of P application. The sorption experiment showed that after incubation of the fertilised soils, the P sorption maximum had lower values in treatments with CP in combination with SSP compared with only SSP fertilisation and the bonding energy had a deeper decrease in the same treatments. Also, the Standard Phosphate Requirement decreased in the CP in combination with SSP treatments. The reduction of soil P sorption capacity after compost addition to soil highlights the need of reducing P fertilisation rates to achieve similar levels of available P compared with only SSP fertilisation.

Assessment of Fertilising Properties of a Solid Digestate in Comparison with Undigested Cattle Slurry Applied to an Acidic Soil

“…In addition, DG showed also a significantly increase (P < 0.001) in the P recovery (87% and 64% in NoPi_DG and NoNiPi_DG, respectively) by the Olsen method (Equation (3) and Figure 3(b)) compared with the NiPi treatment (50%) and even with CS for similar treatments (54% and 33%). In other work with the same type of soil Horta [45] observed a reduction in soil sorption capacity after a compost addition to soil accompanied by an increase in soil available P. This P behaviour was also observed in other works [46] [47] [48] and could be explain by the competition with the phosphate anion for adsorption sites by the organic anions of the organic material (the digestate in our experiment) produced during its decomposition into the soil.…”

Phosphorus Transformation in Soils Following Co-Application of Charcoal and Wood Ash

“…In addition, the incorporation of compost in highly weathered soils can enhance the dissolution and immobilisation of phosphate rock [139,140]. Furthermore, the addition of compost to soils can prevent soil P sorption because P sorption sites and the bonding energy for phosphate sorption to the soil solid phase decreases, resulting in an increase in soil P availability [141].…”

Aplikasi Pemberian Kompos Tandan Kelapa Sawit Untuk Perbaikan Beberapa Sifat Kimia Tanah Beskas Tambang Batu Bara Pada Tanaman Jambon Dan Tanaman Sengon

“…yang berbeda nyata hanya pada amplikasi pemberian kompos TKKS 2 dan 4 kg. Hal Dimana Pemberian TKKS pada tanah akan memepaskan sejumlah ion P yang terikat pada koloit tanah dan akan menambah P teredia didalam tanah ( Horta et al ., 2019).…”