Long-term changes in organic and inorganic phosphorus compounds as affected by long-term synthetic fertilisers and pig manure in arable soils

Abstract

was lower than on adding manure+superphosphate. Other monoester P compounds, typically related to microbial biomass and processes were highest on adding pig manure+urea. When adding superphosphate+urea+pig manure a reduction of these P compounds was observed as well as the highest accumulation of inositol hexakisphosphate (IHP). Synthetic fertilisers increased Olsen-P, orthophosphate and other monoester and total IHP and largely decreased soil pH. The addition of pig manure greatly increased the stereoisomers of IHP (myo-IHP, scyllo-IHP, neo-IHP, and D-chiro-IHP) and the concentration of orthophosphate diesters. D-chiro-IHP was not found in unfertilised soils while neo-IHP was not detected in synthetically fertilised soils. Conclusions P compounds related to microbial processes, such as other monoester, increased when adding pig manure. Additions of superphosphate on top of manures reduced other monoester, while they increased on adding synthetic fertilisers alone.

Crop mobilization of retained phosphorus and changes in phosphorus compounds in soils amended with compost

“…Increases in other-monoester compounds in organic C-enriched cropped soils amended with exogenous organic C have been related to microbial biomass and processes (Li et al, 2022a). In the present study, levels of other-monoesters increased in the organic C-enriched layer of crop-growing soil and incubated plantfree soils.…”

“…However, the IHP in our soils was not related to the levels of microbial biomass or soluble C and it was not an important variable for the discrimination between C-enriched and C-depleted soils in the rst PCA axis, perhaps because of the IHP content in the compost itself. Indeed, higher abundances of IHP have been found during the composting process (Hashimoto et al, 2014) and after adding manures to soils (Li et al, 2022a).…”

“…Agricultural management practices can affect P availability and Po pools (Faucon et al, 2015;Foereid, 2017;Cooper et al, 2018). Increases in Po have been found in minerally fertilised soils after applying P mineral fertilisers alone or combined with manures (Li et al, 2022a), whereas, in other studies, no signi cant changes were observed after applying only manures or plant residues (Annaheim et al, 2015;Jantamenchai et al, 2022). Increasing organic matter in soil favours Pi mobility (Haynes and Mokolobate, 2001), but its effects on Po pools are less clear.…”

“…Indeed, most P in organic amendments is in mineral form (Sharpley and Moyer, 2000;Koopmans et al, 2007;Takahashi, 2013), and applying organic amendments in croplands increase pools of organic C and labile Pi (Romanyà et al, 2017;Zhang et al, 2020). Moreover, the long-term application of organic fertilisers has been found to reduce the Po/Pi ratio, mainly in soils with large increases in organic C (Li et al, 2022a). In contrast, other studies reporting moderate increases or reductions in soil organic C after the application of organic fertilisers observed an increase or no change in the Po/Pi ratio (Romanyà and Rovira, 2009).…”

Long-term fertilization altered microbial community structure in an aeolian sandy soil in northeast China

“…However, pig manure could effectively alleviate soil acidification ( Bei et al, 2018 ); in the present study, the M treatment had the highest pH value. Pig manure is enriched with organic matter and nutrients including nitrogen, phosphorus, and potassium ( Ding et al, 2017 ; Li et al, 2022 ); thus our results indicated general improvements in soil fertility after 12 years of combined application of pig manure and chemical fertilizers on aeolian sandy soil.…”