Effects of Long-Term Use of Organic Fertilizer with Different Dosages on Soil Improvement, Nitrogen Transformation, Tea Yield and Quality in Acidified Tea Plantations.

In contrast, tea yield showed a trend of increasing and then decreasing after the use of high-dosage sheep manure fertilizer (18 t/hm 2 ).

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In this study, the effects of different dosages of sheep manure fertilizer and soil pH value on tea quality were evaluated using the above indexes, and the results showed ( Figure 2 and Figure 3 ) that the use of sheep manure fertilizer was beneficial to improve tea quality, and when the dosage of sheep manure fertilizer was used at 6 t/hm 2 –15 t/hm 2 , the tea quality indexes (tea polyphenols, theanine, amino acids, and caffeine) showed an increasing trend, and when the dosage of sheep manure was 18 t/hm 2 , the content of tea quality indexes showed an increasing trend followed by a decreasing trend.

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The results showed that soil pH value showed an increasing trend after a continuous use of sheep manure fertilizer from 2018 to 2022.

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