Assessing the Effects of Nitrification Inhibitor DMPP on Acidification and Inorganic N Leaching Loss from Tea ( Camellia sinensis L.) Cultivated Soils with Increasing Urea–N Rates

Chunlian Qiao, Shamim Mia, Yeqin Wang, Jiajia Hou and Burenbayin Xu
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Chunlian Qiao: College of Life Sciences, Xinyang Normal University, Xinyang 464000, Henan, China
Shamim Mia: Department of Agronomy, Patuakhali Science and Technology University, Barishal, Bangladesh
Yeqin Wang: College of Life Sciences, Xinyang Normal University, Xinyang 464000, Henan, China
Jiajia Hou: College of Life Sciences, Xinyang Normal University, Xinyang 464000, Henan, China
Burenbayin Xu: College of Life Sciences, Xinyang Normal University, Xinyang 464000, Henan, China

Sustainability, 2021, vol. 13, issue 2, 1-8

Abstract: The effects of nitrification inhibitor in tea gardens with different urea–N rates have rarely been assessed. For eight months, a glasshouse experiment was conducted to investigate the effects of a nitrification inhibitor (3, 4–dimethylpyrazole phosphate, DMPP) on the changes of soil pH and inorganic N loss. Urea (0, 300, 500, and 800 kg N ha −1 ) with or without DMPP (1% of urea–N applied) were added to pots that hosted six plants that were three years old. Next, three leaching events were conducted with 600 mL of water after 7, 35, and 71 days of intervention while soil samples were collected to determine pH and inorganic N. Averaged across sampling dates, urea–N application at an increasing rate reduced soil pH with the lowest values at 800 kg urea–N ha −1 . Adding DMPP increased soil pH up to a rate of 500 kg ha −1 . Irrespective of the addition of DMPP, gradient urea–N application increased the leaching loss of inorganic N. On overage, DMPP increased soil pH and decreased leaching losses of total inorganic N, suggesting a higher soil N retention. Therefore, we believe that this increase in soil pH is associated with a relatively lower proton release from the reduced nitrification in the DMPP–receiving pots. This nitrification reduction also contributed to the N loss reduction (NO 3 − –N). Altogether, our results suggest that DMPP can reduce N leaching loss while maintaining the pH of tea–cultivated soils. Therefore, DMPP application has a significant potential for the sustainable N management of tea gardens.

Keywords: DMPP; soil acidification; nitrification inhibitor; inorganic N leaching; soil N (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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