Abstract:
The reasonable fertilization plays an important role to promote the yield and the quality of tea. A three-year field experiment was conducted to investigate the effects of six fertilization modes (common fertilizer, CF; controlled-release compound fertilizer, CRF; CF + organic fertilizer, CF + OF; CRF + OF; 70%CF + OF; 70% CRF + OF) on soil chemistry, yield and quality of tea leaves. The results showed that under the same amount of fertilizer, the single application of CRF to tea tree could achieve the same effect of increasing yield by the ordinary CF applied 4 times per year, and significantly improved the quality of summer tea as well. Compared with the CF application alone, the organic fertilizer application could significantly increase the yield of tea leaves by 10.6% ~ 14.0% and promote the net income by 8.0% ~ 18.3%. Moreover, it significantly increased the tea water extracts and the free amino acids, reduced the contents of tea polyphenols and the phenol-ammonia ratio. Compared with the CF + OF treatment, the CRF + OF treatment significantly improved the yield of tea leaves by 3.0% and promote the net income by 7.6% ~ 8.5%. Meanwhile, the contents of summer tea extracts were increased by 1.34% ~ 1.39%, while the contents of tea polyphenols were decreased by 2.7% ~ 4.7%. There were no significantly differences in the yield and the quality of tea leaves between the treatments with 70% CF + OF or 70% CRF + OF and those with 100%fertilizer application + OF. The organic fertilizer application significantly increased soil pH, organic matter, total nitrogen and available nitrogen in the 0 ~ 20 cm soil layer. In general, from the aspects of fertilization convenience, tea yield, net income, quality and soil nutrient, the combined application of CRF with 30% reduction and organic fertilizer would the best recommended fertilization measure.