Nitrogen dynamics in salt-affected soils in Khorat Basin and its availability effect on yield and quality of Khao Dawk Mali 105 (KDML 105) cultivar

Name: Peangdin Chaiyapo

LCSH: Kasetsart University -- Dissertations. Ph.D. (Soil Science) 2023.

Classification :.LCCS: S667.R5

LCSH: Kasetsart University. -- Department of Soil Science -- Dissertations.

LCSH: Rice -- Soils.

LCSH: Rice -- Fertilizers.

LCSH: Soil fertility.

LCSH: Soil amendments.

LCSH: Nitrogen fertilizers.

LCSH: Organic wastes as fertilizer.

Abstract: Four soils series, namely Phimai (Pm), Roi Et (Re), Kula Ronghai (Ki), and Ud (Udon) soil series, were chosen and collected from salt-affected areas in Khorat basin, Northeast Thailand. Four agricultural organic wastes (OWs): rice husk (RH), rice straw (RS), burnt rice husk (BRH), and chicken manure (CM) and four levels of N fertilizer: 0, 40, 80, 160, and 320 kg N ha-1 were separately used for the study on nitrogen (N) dynamics and the response of Khao Dawk Mali 105 rice (KDML 105) in both greenhouse and field experiments. Suitable chemical extraction methods used for assessing soil N availability indices for KDML 105 rice were determined. Nitrification inhibitors (NIs): Dicyandiamide (DCD) and Neem on greenhouse gas production were investigated under a controlled laboratory. Results showed that with the application of all OWs applied at an equivalent rate to 80 kg N ha-1 , total mineral N and mineralized N were significantly increased in all OWs applied, particularly in CM amended soil. The maximum percentage of N input was recorded at d-14 in Ki-1 and Re-1 soils, d-21 in Pm-2 and Ki-2 soils, and d-28 in Pm-1 and Re-2 soils during 112 days of the incubation. Sole application of OWs markedly increased growth and yield of KDML 105 rice while CM and BRH gave similar grain yield to that of urea in some soils. In addition, KDML 105 rice responded clearly to N fertilizer that the highest yield was obtained at the rate of 160 and 320 kg N ha-1 under field and greenhouse conditions, respectively. The extractable N was different among the extractant methods while the highest and lowest ranges were extracted by PBP and Alkaline KMnO4, respectively. Among soil properties, extractable N significantly positively correlated with total N (r>0.54*) and organic matter (r>0.50*), but negatively correlated with soil pH (r>-0.48*), SAR (r>0.50*) and ESP (r>0.52*). Among all seven examined single soil extraction methods, total N and organic matter showed no significant correlation with N concentration, N uptake and yield of KDML 105 rice, reflecting that they failed to be used as N availability indices for KDML 105 rice grown in these studied soils. Both DCD and neem could be used to increase the efficiency of N fertilizer in these salt-affected soils by delaying nitrification and significantly decreasing NO3 - -N and GHG contents compared to urea alone. However, their inhibitory effects were wholly retarded in the soil with the highest levels of salinity and sodicity.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Suphicha Thanachit.

Role: Thesis Advisor

Name: Somchai Anusontpornperm

Role: Thesis Co-Advisor

Name: Irb Kheoruenromne

Role: Thesis Co-Advisor

Created: 2023

Modified: 2025-06-26

Issued: 2025-06-26

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/peangdin-cha-all.pdf

CallNumber: S667.R5.P43

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Soil Science

Grantor: Kasetsart University

©copyrights Kasetsart University

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