Coated Diammonium Phosphate Combined With Humic Acid Improves Soil Phosphorus Availability and Photosynthesis and the Yield of Maize.

Front Plant Sci · 2021 · PMC8716685 · PMID 34975942

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an increasing trendno p-value reported

All treatments exhibited an increasing trend in SPAD values over time ( Figure 5 ).

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