Improvement of soil acidification in tea plantations by long-term use of organic fertilizers and its effect on tea yield and quality

Abstract

Soil acidification in tea plantation seriously reduced the yield and quality of tea. It was an effective method to use organic fertilizer for acidified soil remediation to ensure tea yield and quality. In this study, different fertilizers were used to treat the acidified tea plantation soils for 4 consecutive years to analyze the remediation effect of different fertilizers on acidified soil and their effects on tea yield and quality. The results showed that during the period of 2017-2021, the soil pH value of tea plantation (S1) with long-term use of chemical fertilizer decreased continuously, from 3.07 to 2.82. In the tea plantation (S2), the soil pH value was stable between 4.26 and 4.65 in the combination of organic fertilizer and chemical fertilizer for a long time. The tea plantation (S3) with long-term use of organic fertilizer has a stable soil pH value between 5.13 and 5.33, which is most suitable for the growth of tea trees. The analysis results of tea yield and quality indicators (tea polyphenols, theanine, amino acids, caffeine, catechin components) showed that after long-term use of chemical fertilizer in S1 tea plantation, soil pH value decreased continuously, soil acidification intensified, tea tree growth was hindered, and tea yield and quality decreased continuously. S2 tea plantation used some organic fertilizer in combination with chemical fertilizer for a long time, the soil pH value gradually improved, soil acidification weakened, and tea yield and quality improved steadily. After long-term use of organic fertilizer in S3 tea plantation, soil acidification was significantly improved, which was conducive to the normal growth of tea trees and the yield and quality of tea reached the maximum. The results of interaction analysis showed that the long-term use of chemical fertilizer had a negative effect on the growth of tea trees, and the combination of organic fertilizer and chemical fertilizer improved the growth of tea trees to some extent, but the effect was poor, while the long-term use of organic fertilizer was the most beneficial to the growth of tea trees and most conducive to ensuring the yield and quality of tea. This study provides important practical significance for the remediation and fertilizer regulation of acidified tea plantation soils. In the process of field experiment, climate is a variable factor, and attention should be paid to the effect of climate change on fertilization efficiency in subsequent experiment.

Application of Wheat Straw Compost Mixed with Chemical Fertilizer Regulates Soil Bacterial Community Diversity in Tea (Camellia sinensis) Plantation

“…When assessing the impact of fertilizer management on tea quality, tea polyphenols, free amino acids, and caffeine contents were typically used as assessment indicators. In this study, free amino acid content increased significantly with compost supply (Table 2), which is in line with the previous results [36,37]. Additionally, polyphenols are what give tea its sour and acerbic tastes.…”

“…The tea quality, as the guarantee of economic benefits, was significantly affected by fertilization managements [36]. When assessing the impact of fertilizer management on tea quality, tea polyphenols, free amino acids, and caffeine contents were typically used as assessment indicators.…”

Metabolomics analysis of the effect of acidification on rhizosphere soil microecosystem of tea tree

“…Soil pH was measured with a pH meter (PB-10, Sartorius) at a soil to water ratio of 1:2.5, and 5 replicates were used for each sample (Ye et al, 2022). Soil organic matter content was determined by oxidation with potassium dichromate and external heating, and soil cation exchange capacity was determined by neutral ammonium acetate (Wang et al, 2020a).…”

Understanding and exploring the diversity of soil microorganisms in tea (Camellia sinensis) gardens: toward sustainable tea production

“…The heavy use of chemical fertilizers can decrease soil pH while the use of organic fertilizers can regulate soil pH. Ye et al (2022) reported that the long-term use of chemical fertilizer led to a continuous decrease in soil pH from 3.07-2.82 in tea plantations in Southeast China while the long-term use of organic fertilizer led to a stable pH of 5.13-5.33, which is suitable for growth, improved yield, and quality of tea. Persistent decreases in soil pH in addition to decreasing microbial diversity, may result in the denaturing of soil enzymes, and lowered nutrient solubility and availability to plants, as well as increased aluminium and/or heavy metals toxicity as lowered soil pH can increase solubility of certain toxic chemicals, resulting both direct plant toxicity, decreased soil microbial diversity, and equally important in terms of relevance to human consumption, accumulation of toxic metals by the plant (Yan et al, 2021;Naz et al, 2022).…”