Long-term application of fertilizer and manures affect P fractions in Mollisol.

Sci Rep · 2020 · PMC7481193 · PMID 32908161

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an increasing trendno p-value reported

51 reported that the concentrations of total and available P have shown an increasing trend with increasing manure application rate.

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a decreasing trendno p-value reported

Different fertilizer treatments have significantly impacted Ca 2 -P and Ca 8 -P concentrations as deep as 0–40 cm depth ( P < 0.05), showing a decreasing trend as OM > NPK > NPK + S.

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may not be significantno p-value reported

However, crop response to P fertilizer may not be significant when available P concentration in soil is higher than an optimum or agronomic threshold value 39 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.