Soil silicon availability and its effect on sugarcane yield grown in Sa Kaeo Province

Name: Karuna Poomsong.

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

Classification :.DDC: S667.S9

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

LCSH: Sugarcane -- Soils.

LCSH: Soils -- Silicon content

LCSH: Plant nutrients.

Abstract: Silicon (Si) is not considered an essential element for plant development but plays an important role as a beneficial element, especially for sugarcane. Si concentrations in the soil are inevitably reduced after multiple harvests, as the same areas have been used for cropping for several decades. They were leading to the continual removal of Si from harvested products. Different chemical extractants are developed to assess plant-available Si. Si availability assessment is determined from the Si content in soil extracts using ultraviolet-visible spectroscopy (UV-Vis) and atomic absorption spectroscopy (AAS). The objectives of this study were to determine the relationship between available Si in soil using various extractant solutions and the Si yield of sugarcane, to investigate the condition of soil properties on available Si content that effect sugarcane yield, and to compare Si determination in extracts by the UV-Vis and AAS in sugarcane growing soils. The soil-sugarcane samples from 47 farmer fields in Khlong Hat district, Sa Kaeo province were investigated for Si availability status in soil extracted with Mehlich I, 0.01 M hydrochloric acid (HCl), 0.005 M sulfuric acid (H2SO4), 0.5 M acetic acid (CH3COOH), 1 M sodium acetate (NaOAc), 0.5 M ammonium acetate (NH4OAc), 0.01 M calcium chloride (CaCl2), 0.01 M potassium chloride (KCl), and deionized water and other physiochemical properties. The extractant Mehlich I gave maximum Si extractability by the UV-Vis measurement, and deionized water gave maximum Si extractability by the AAS measurement. Most of the sugarcane growing soils had sufficient Si availability. Positive correlations of Si availability in soils extracted by Mehlich I, 0.5 M CH3COOH, 0.5 M NH4OAc, and 0.01 M KCl were positively related to cane yields, representing more suitable extractants of Si availability from the soil. The relationship between UV-Vis and AAS determinations was highly linear regressions in 0.5 M NH4OAc (R 2 = 0.99), Mehlich-I (R 2 = 0.99), 0.5 M CH3COOH (R 2 = 0.86), 0.01 M CaCl2 (R 2 = 0.82), and 0.01 M KCl extractions (R 2 = 0.77), respectively. The relationship between UV-Vis and AAS determinations was low for deionized water (R 2 = 0.56), 1 M NaOAc (R 2 = 0.53), 0.01 M HCl (R 2 = 0.48), and 0.005 M H2SO4 (R 2 = 0.38), respectively. Significant correlation coefficients were found between nine extractable Si on percent sand, silt, and clay, soil organic matter content, extractable Cu, total N, cation exchange capacity, exchangeable Ca, oxalate-extractable iron, oxalate-extractable manganese, oxalate-extractable aluminum, and dithionite-citrate-bicarbonate extraction extractable manganese. The results suggest that these nine extractants characterize different pools of Sisupplying capacity of the soil, and the extraction pH conditions significantly influence the extractants' efficiency. The UV-Vis technique is better than AAS technique for determining Si availability in sugarcane-growing soils. Mehlich I and KCl could be alternative methods for extracting Si because they are frequently used to determine available plant nutrients in routine soil analysis and are relatively inexpensive. Further, the KCl method has additional advantages over others as it is easy to prepare and does not require a concentration of acids, thus reducing the operator's risk.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Saowanuch Tawornpruek

Role: Thesis Advisor

Name: Worachart Wisawapipat

Role: Thesis Co-Advisor

Created: 2023

Modified: 2025-06-24

Issued: 2025-06-24

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: https://kasetsart.idm.oclc.org/login?url=http://www.lib.ku.ac.th/KUthesis/2566/karuna-poo-all.pdf

CallNumber: S667.S9.K37

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Soil Science

Grantor: Kasetsart University

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