Effects of chicken manure substitution for mineral nitrogen fertilizer on crop yield and soil fertility in a reduced nitrogen input regime of North-Central China.

Front Plant Sci · 2022 · PMC9798097 · PMID 36589091

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showed a trendno p-value reported

The average annual yield of the wheat-maize rotation system showed a trend of increasing and then decreasing as the manure substitution ratio increased.

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a decreasing trendno p-value reported

The REN showed a decreasing trend when the chicken manure substitution ratio was greater than 60% and reached a significant reduction level when it was greater than 80%.

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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.