Investigation of the soil properties that affect Olsen P critical values in different soil types and impact on P fertiliser recommendations

Abstract

Optimization of phosphorus (P) fertiliser use is desired to ensure more sustainable use of fertiliser, economic food production and reduction of eutrophication of water bodies. Presently, the Olsen P values on which fertiliser recommendations are based to achieve optimum yield are frequently the same for all soils. The aim of this study was to identify the properties of different soils that affect their critical Olsen P values in order to develop better, soilspecific P fertiliser recommendations. A pot experiment using 10 soils with low available P with different P additions was carried out to investigate the impact of wide-ranging soil properties on the relationship between P addition, resultant Olsen P values and yield response of ryegrass to Olsen P values. The relationship between added P and Olsen P varied greatly between the individual soils. These relationships were affected by pH, manganese oxide, crystalline aluminium oxide and amorphous iron oxide contents of the soil. Different soils had widely varying critical Olsen P values for ryegrass. However, these could not be related to the measured soil properties. Fertiliser recommendations and critical values for optimum yield of ryegrass based on the Olsen P test should be soil specific. The complexity and lack of clarity over which combination of soil properties governs critical Olsen P values calls for further investigation with more soil types and additional soil property measurements to elucidate the different factors controlling critical Olsen P values in different soils. Highlights• Soil-specific P fertiliser recommendations are needed for sustainable fertiliser use • We investigated soil properties affecting critical Olsen P values and added P fertiliser availability • Fertiliser P availability was affected by pH and metal (hydr)oxide contents of the soil

Obtaining an important component of humate-enriched organomineral fertiliser based on oxidised lignite from Kyrgyzstan

“…Humified fertilisers also help improve soil resistance to drought and erosion. Improved soil structure enriched with organic components helps to conserve moisture and prevent soil layers from being washed away by intense rainfall or irrigation (Tandy et al, 2021;Ros et al, 2020). These results demonstrate the potential of using local resources, such as lignite, to develop sustainable and effective organomineral fertilisers that can contribute to improved agriculture and environmental conservation in Kyrgyzstan (Sun et al, 2020).…”

The effect of soil type on yield and micronutrient content of pasture species

“…Initial soil NPK PLOS ONE levels were assessed and amended according to the advice given to UK farmers [18]. That the soil N and P concentrations were still variable after macronutrient addition demonstrates that in different soils these additions are not necessarily translated into equal increases in available nutrients [23], and shows that the soils on which pastures are grown may have very different macronutrient availabilities even when fertilizer recommendations are followed.…”

Enhancing phosphorus bioavailability in lateritic red soil: Combining Bacillus subtilis inoculated microbial organic fertilizer with reduced chemical input

“…In many soil types, the concentrations of Fe and Al oxides, as well as hydroxides and their organic matter complexes, affect P adsorption. The rate of P transport in Fe‐rich laterite soil is significantly lower than that in other soil types (Ma et al., 2021; Tandy et al., 2021). Furthermore, soil P forms are related to soil pH.…”

“…Furthermore, soil P forms are related to soil pH. In acidic and neutral soils, P sorption by soil is mainly controlled by Fe and Al oxides and calcium carbonate (Daly et al., 2015; Tandy et al., 2021). Moreover, different fertilizer application strategies have different degrees of influence on soil P forms (Wan et al., 2020).…”