Student Research Reports
A Comparative Study of Temperature and Moisture Drainage in Transplanted and Direct-Seeded Rice Fields
Organization(s):Kalasinpittayasan
Country:Thailand
Student(s):Ms.Saruda Wannatong Ms.Irin Kongnarong Ms.Natchalidatorn Matsa-ard
Ms. Pirada Imruttanakul
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Educator(s):Chumpon Chareesaen
Contributors:
Report Type(s):International Virtual Science Symposium Report
Protocols:Soil Moisture - SMAP Block Pattern, Soil Temperature
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Language(s):English
Date Submitted:03/05/2025

Thailand is an agricultural country where rice cultivation plays a crucial role in the
economy and livelihoods of its people. The two primary rice cultivation methods,
transplanted rice fields and direct-seeded rice fields, differ in terms of water management
and soil structure. This study aims to compare soil drainage and temperature between these
two cultivation methods through field experiments measuring soil moisture and temperature
over four weeks.The results indicate that transplanted rice fields exhibit superior water
retention compared to direct-seeded rice fields in the long term. In the first week, soil
moisture in transplanted rice fields reached 18.37%, whereas in direct-seeded fields, it was
8.98%. However, moisture levels in transplanted rice fields declined rapidly in the second
week before stabilizing in the third and fourth weeks, remaining significantly higher than in
direct-seeded fields. This finding suggests that transplanted rice fields are more effective at
retaining soil moisture over time.Regarding soil temperature, direct-seeded rice fields
consistently exhibited higher temperatures than transplanted fields throughout the study
period. In the first week, soil temperature in transplanted rice fields was 23.67°C, while in
direct-seeded fields, it was 25°C. The temperature increased progressively, reaching 24.33°C
in transplanted rice fields and 27.33°C in direct-seeded fields by the fourth week. The key
factors influencing these differences were soil moisture levels and water retention, with the
presence of standing water in transplanted fields helping to lower soil temperature during
early growth stages.This study highlights the advantages of transplanted rice fields in
maintaining soil moisture and regulating soil temperature compared to direct-seeded fields.
These findings provide valuable insights into selecting appropriate cultivation methods based
on environmental conditions and water management strategies. Effective water management
can enhance rice yield and promote sustainable agriculture in the long term.