Nitrogen fertilizer application with Urease and nitrification inhibitors affected on soil Nitrogen transformations, Nitrous oxide emissions and Nitrogen use efficiency on Sugarcane cultivation

Name: Phatchariya Welutung.

LCSH: Kasetsart University -- Dissertations. Ph.D. (Environmental Technology and Management) 2022.

Classification :.LCCS: S667.S9

LCSH: Kasetsart University. -- Department of Environmental Technology and Management -- Dissertations.

LCSH: Sugarcane -- Fertilizers.

LCSH: Nitrogen fertilizers.

LCSH: Nitrification.

LCSH: Nitrous oxide.

LCSH: Urease

LCSH: Greenhouse gas mitigation.

Abstract: Improving nitrogen (N) fertilizer use and reducing N losses through applying the appropriate N fertilizer rate with urease inhibitors (UIs) and nitrification inhibitors (NIs) may enhance crop production, the efficiency of N use and could be the key to the successful mitigation of soil nitrous oxide (N2O) emissions. This study investigated the effect of fertilizer application based on common farmer practice (F) and soil analysis (S) and UIs, NIs and their combination (UINIs) on soil N transformation under laboratory soil incubation. Synthetic UI and NI used in this study were N-(n-butyl) thiophosphoric triamide (NBPT) and dimethylpyrazole phosphate (DMPP), and the UIs and NIs from plants were garlic (Allium sativum L.) and ground neem seed (Azadirachta indica A. Juss. var. siamensis Valeton), and praxelis (Praxelis clematidea (Griseb.) R.M. King & H. Rob). The result showed that NBPT, DMPP and praxelis tended to retain an accumulative ammonium by 15.49, 14.74 and 14.67% higher than only urea, respectively. All inhibitors had a potential for retarded nitrification rate up to 3 weeks by praxelis achieved 24.09% of inhibition of nitrification. Sugarcane (Saccharum officinarum L.) and bare soil field experiments were established in Central Thailand to study the efficiency of UIs, NIs and UINIs on soil inorganic N, sugarcane growth and productivity, N uptake and soil N2O emissions. The results indicated enhanced sugarcane growth and an apparent increase (up to 31%) in the cane and sugar yields in all the inhibitory treatments. Compared to the F, the proper N fertilizer application associated with NIs in the sugarcane field decreased soil N2O emissions by up to 19.08%, followed by UINIs and UIs (17.01 and 15.86%, respectively), while there was 18.85% N2O reduction with praxelis. The use of inhibitors decreased soil N2O emission factor (EF) values in the sugarcane plots by 1.07–1.62%, compared to 1.82% for S treatment. Notably, F had a lower soil N2O EF (0.65%). Moreover, inhibitor treatments significantly enhanced aboveground biomass and N content in plants up to 41.5 and 41.9% compared to only fertilizer, but only 13.6% of commercial cane sugar. The findings suggested that reducing N fertilizer use and applying UIs, NIs and UINIs had great potential to minimize greenhouse gas emissions (GHG) from the soil and improve N utilization by plants. These results regarding the use of soil N2O EFs in a sugarcane field could provide supporting data for the national GHG inventory and be adopted for mitigation measures in Thailand. Furthermore, the findings suggest that more research on the effectiveness of prexelis with regards to side effects and concerns.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Patthra Pengthamkeerati

Role: Thesis Advisor

Name: Saowanuch Tawornpruek

Role: Thesis Co-Advisor

Name: Boonlue Kachenchart

Role: Thesis Co-Advisor

Created: 2022

Modified: 2025-06-26

Issued: 2025-06-26

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2565/phatchariya-wel-all.pdf

CallNumber: S667.S9.P43

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology and Management

Grantor: Kasetsart University

©copyrights Kasetsart University

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