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| Experimental study on soil nitrogen transport and transformation of Panax notoginseng under micro-sprinkling irrigation fertilization |
| WANG Qian1, TUO Yunfei1, WANG Fei1, SHEN Fangyuan1, ZHENG Yang1,DU Wenjuan1, XIANG Ping1, YANG Qiliang2 |
| 1. College of Ecology and Environment, Southwest Forestry University, Kunming, Yunnan 650224, China; 2. College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract To investigate the effect of micro-sprinkler irrigation fertilization on soil nitrogen transport and transformation of Panax notoginseng, three irrigation levels of 0.4 FC(W1), 0.6 FC(W2)and 0.8 FC(W3)and four fertilization levels of 3.20(F1), 4.80(F2), 6.20(F3)and 120.00 kg/ha(F4)were set up at the Panax notoginseng cultivation base in Dalishu Village, Luxi County from 2017 to 2020, with CK as control, for a total of 13 treatments. The study was conducted to investigate the effect of different irrigation fertilization conditions on the transport and transformation of total nitrogen, nitrate nitrogen and ammo-nium nitrogen in Panax notoginseng soils under micro sprinkler irrigation. The results show that the soil total nitrogen content increases and then decreases with time, the nitrate nitrogen content decreases and then increases with time, and the ammonium nitrogen content gradually decreases with time under different irrigation fertilization conditions. Total nitrogen and ammonium nitrogen content gradually decrease with increasing soil depth, while nitrate nitrogen content first decreases and then increases with increasing soil depth, with total nitrogen, nitrate nitrogen and ammonium nitrogen tending to accumulate in the soil layer 0-10 cm, with W2F3 soil having the highest total nitrogen content, W2F3 soil having the highest nitrate nitrogen content and W2F4 having the highest ammonium nitrogen content. The amount of irrigation water is highly significantly correlated with soil nitrate nitroge and soil ammonium nitrogen(P<0.01)and negatively correlated with soil total nitrogen(P<0.05), while the amount of fertilizer applied is positively correlated with soil nitrate nitrogen and highly significantly correlated with soil ammonium nitrogen(P<0.01)and significantly correlated with soil ammonium nitrogen(P<0.05). This study aims to clarify the characteristics of irrigation fertilization in regulating nitrogen transport and transformation of Panax notoginseng in acidic red loam soils, improve the micro-ecological environment of farmland, enhance water and nitrogen use efficiency, and provide technical support and theoretical basis for effective pest and disease control.
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Received: 29 September 2021
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