Characteristics of soil carbon and nitrogen content, enzyme activity and Panax notoginseng yield under the control of water and fertilizer
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DOI:10.7606/j.issn.1000-7601.2024.01.08
Key Words: water and fertilizer regulation  soil carbon and nitrogen content  soil enzymatic activity  Panax notoginseng  yield
Author NameAffiliation
SHI Xiaolan College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
TUO Yunfei College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
DING Mingjing College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
LIU Xiangning College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
WANG Zhaoyi College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
LIU Yanwei College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China 
XIANG Ping College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China 
YANG Qiliang College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China 
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Abstract:
      Three irrigation levels (5 mm, W1; 10 mm, W2; 15 mm, W3) and four distinct fertility periods (rooting, seedling, flowering, fruiting) were established, along with varied fertilization ratios (F1: 25%∶25%∶25%∶25%; F2: 20%∶25%∶30%∶25%; F3: 15%∶30%∶30%∶25%; F4: 10%∶40%∶20%∶30%) in Yunnan Province in 2018-2021. The entire life cycle under non\|irrigated fertilizer treatment served as the control (CK) to investigate effects of different water and fertilization control modes on soil carbon and nitrogen content, enzyme activity, Panax notoginseng yield, total saponin content and the interrelationships among the indexes were investigated, and the CRITIC-VIKOR method was used for the comprehensive evaluation of the most suitable water and fertilization control modes. The results showed that: irrigation water and fertilizer ratios at different fertility periods had significant effects (P<0.05) on soil total nitrogen, organic carbon, urease, acid phosphatase, sucrase and catalase activities as well as yield and total saponin content in P. notoginseng at the root increase stage, seedling, flowering and fruiting stages. The total nitrogen content of the W2F3 treatment at the flowering stage was significantly higher than that of the other treatments by 7.69%~92.50% compared to that of CK, and the soil organic carbon content of the W1F1 treatment at the flowering stage was significantly higher than that of the other treatments by 5.11%~7.11%. The mean values of soil urease, sucrase and acid phosphatase activities at different irrigation and fertilization levels during the root increase period were increased by 7.20%, 19.82%, and 47.44% compared with CK, and peroxidase activity was decreased by 19.16%. Compared with CK, post\|harvest water and fertilizer regulation treatments of P. notoginseng increased water use efficiency by 53.83% on average, fertilizer bias productivity by 66.30% on average, W2F4 treatment had the highest yield (2 797.25 kg·hm-2), and W2F3 treatment had the highest total saponin content (176.34 mg·g-1). The combined scoring method revealed specific Q values for P. notoginseng: 0.03 for the W3F1 treatment during the root increase stage, 0.02 for W2F3 during the seedling stage, 0.01 for W2F3 during flowering, and 0.02 for W3F2 during fruiting. The analysis identified W3F1 and W3F2 as the optimal irrigation and fertilization schemes for the root increase and fruiting stages, while W2F3 emerged as the optimal scheme for the seedling and flowering stages.