@Article{phyton.2024.054182,
AUTHOR = {Mingkun Cheng, Ju Min, Yanying Zhang, Yuhe Wang, Xia Wang, Weiming Shi},
TITLE = {Contributions of Volume and Concentration on Runoff Nitrogen Losses from Intensive Vegetable in China},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {93},
YEAR = {2024},
NUMBER = {9},
PAGES = {2439--2453},
URL = {http://www.techscience.com/phyton/v93n9/58186},
ISSN = {1851-5657},
ABSTRACT = {Vegetable runoff nitrogen (N) loss is a serious environmental issue. However, whether the volume or N content of runoff determines the final N losses has not been clarified, which limited the optimal N managements in vegetable production. Here, we conducted a simulated rainfall experiment to study the runoff N loss flux pattern and the accumulation rate as well as the main influencing factors. The results showed that at 20 to 30 min, the volume of runoff water with a high N content reaches a critical inflection point of increase. Under 55 mm/h rainfall intensity, the N concentration decreased continuously. Under 75 mm/h, the soluble N concentration decreased during the first 25 min; thereafter, it stabilized. However, the total and particulate N decreased significantly after 30 min. Nitrogen losses via runoff from vegetable fields were from 18.5 to 26.0 kg/ha under two rainfall intensities. Runoff soluble N losses were mainly attributed to applied fertilizers (79.7%–95.5%), while particulate N losses were primarily originated from soil-retained N. Our data indicates that there was a significant difference in N losses pattern and influencing factors under varied fertilizer N inputs and rainfall intensities, which can help to optimize water and N fertilizer managements to mitigate non-point source N pollutants. In the future, long-term multi-site and -crop studies should be conducted to comprehensively clarify the N runoff losses in vegetable soils.},
DOI = {10.32604/phyton.2024.054182}
}