Soil fertility and tea quality of tea plantation under sprinkler irrigation
MIAO Zimei1, LI Jingchun1*, CHEN Dong2, WANG Weihan3
1.School of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Huai′an Water Investigation, Design and Research Co.Ltd. Huaian, Jiangsu 223025, China; 3.Dean′s office, zhejiang University of water Resources and Electric Power, Hangzhou, Zhejiang 310018, China
Based on the regulation of water under sprinkler irrigation, field experiments were conducted to investigate the tea soil fertility index(including soil nitrogen, soil temperature)and tea quality indexes(including amino acid, tea polyphenol)dynamic changes. The results show that total nitrogen(TN)in surface soil layer under sprinkler irrigation was the highest.With the increase of soil depth, TN content decreased, and TN content of sprinkler irrigation treatment was slightly higher than that of the conventional treatment. Changes of available nitrogen content presented the same trend as TN content. Compared with the conventional irrigation treatment, the average content of soil TN increased by 3.3%-22.2%, and the average content of available nitrogen increased by 7.1%-24.7% under the sprinkler irrigation treatment. Moreover, soil temperatures in surface soil layer and 20 cm soil layer of the sprinkler irrigation treatment were both higher than those of the conventional treatment. For surface soil layer, the soil temperature was lowest at 5:00, 1 hour in advance compared to the conventional treatment, and highest at 14:00, synchronized with the conventional treatment. For 20 cm soil layer, the soil temperature was lowest at 8:00, 2 hours in advance compared to the conventional treatment, and it was highest at 17: 00, nearly 2 hours in advance compared to the conventional treatment. In addition, the content of amino acids decreased first and then increased, while the tea polyphenol content increased first and then decreased. Both the contents of amino acid and tea polyphenol of the sprinkler irrigation treatment were higher than those of the conventional treatment. Compared to the conventional treatment, the content of amino acid increased by 12.21% and that of tea polyphenol increased by 17.03% under the sprinkler irrigation treatment.
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