Changes in paddy soil fertility in Thailand due to the Green Revolution during the last 50 years

Yanai, Junta; Hirose, Mina; Tanaka, Sota; Sakamoto, Keita; Nakao, Atsushi; Dejbhimon, Ketsuda; Sriprachote, Anongnat; Kanyawongha, Porntiva; Lattirasuvan, Thanakorn; Abe, Shinichi

doi:10.1080/00380768.2020.1814115

Cited by 17 publications

(23 citation statements)

References 33 publications

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“…The most prominent was the increased P availability compared with P-deficient status in 1965, which could be ascribed to plentiful P fertilizer application as well as the alleviation of soil acidity by using the liming materials and P fertilizers. The similar result was obtained in Thailand (Yanai et al 2020).…”

Section: Changes In Lowland Paddy Soils In Peninsular Malaysia After the Green Revolutionsupporting

confidence: 88%

“…The composition of exchangeable bases significantly altered toward Ca-rich and Mg-and Nalow status, indicating the replacement of soil Mg and Na with Ca added as the P fertilizers or GML. The reduction of Mg was in accordance with the case in Thailand (Yanai et al 2020). It is noteworthy that the soils in the brackish environments (BS and BA) persisted Mg-and Na-rich in nature to some extent.…”

Section: Changes In Lowland Paddy Soils In Peninsular Malaysia After the Green Revolutionsupporting

confidence: 84%

“…Soil samples were collected from the depth of 0-15 cm at 5 points within each field, mixed well to make one composite sample and air-dried to pass through a 2 mm mesh sieve. The analytical methodology was based on Kawaguchi and Kyuma (1969) and described in Yanai et al (2020). pH (H 2 O) and EC were measured by the grass electrode method.…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

“…All of the measurements except total C and N from the depth of 0-15 cm in the present study were directly compared with those from the most upper A horizon tabled in Kawaguchi and Kyuma (1969) as the references after unit conversion if necessary. Because their study had adopted the Tyurin method for total C and the Kjeldahl method for total N, these data were multiplied by the factors of 1.2 and 1.1, respectively, for the comparison, which were determined via the dry combustion method based on a preliminary experiment (Yanai et al 2020). These values were reasonably close to the reported average values of 1.25 for C (Nelson and Sommers 1996) and 1.10 for N (Bremner 1996).…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

“…Limited studies have been conducted so far from a long-term viewpoint (for example, Ali et al 1997 in Bangladesh; Darmawan et al 2006 in Indonesia). In 2010s, we carried out a series of follow-up studies to assess soil fertility status in Thailand (Yanai et al 2020) and Peninsular Malaysia (the present study) as well as the Philippines and Bangladesh (forthcoming). The results of these countries will be compared elsewhere.…”

Section: Introductionmentioning

confidence: 99%

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Long-term changes in paddy soil fertility in Peninsular Malaysia during 50 years after the Green Revolution with special reference to their physiographic environments

Tanaka

Saito

Kajiwara

et al. 2020

Soil Science and Plant Nutrition

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The objective of this study was to investigate the current soil properties in lowland paddy fields in Peninsular Malaysia and to assess the long-term changes in the soil fertility status during 50 years after the Green Revolution. Forty paddy fields were selected close to the study sites surveyed in 1965 and grouped based on six physiographic environments: the brackish swamp (including acid sulfate soils), the brackish alluvium, the freshwater swampand the riverine alluvium in the west coast, and the riverine alluvium and the beach ridges interspersed with swales in the east coast. Soil samples from the depth of 0-15 cm were analyzed for the physicochemical properties. Despite similar fertilizer application rates over Peninsular Malaysia, several differences were found in the current soil properties between different physiographic environments, such as 1) higher levels of clay fraction, 1.4 nm minerals, CEC, exchangeable bases and available Si as well as Mg-and Na-rich status in the brackish environments, 2) higher levels of available N in the riverine alluvium environment in the east coast , and 3) the excessive P accumulation in the acid sulfate soils. The long-term changes well appeared in the dramatic increase of P availability and the alleviation of soil acidity. In addition, the composition of exchangeable bases changed toward Ca-rich and Mg-low status. Large reduction in soil organic matter was found in the swamp environments while those in the riverine alluvium environment in the east coast were increased. It could be concluded that despite the successful increase in rice yield after the Green Revolution, the long-term changes in the paddy soil fertility showed positive and negative aspects depending on physiographic environments. Appropriate fertilizer application schemes taking into account different soil characteristics in different physiographic environments should be required to achieve both efficient, sustainable rice production and environmental conservation.

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Section: Changes In Lowland Paddy Soils In Peninsular Malaysia After the Green Revolutionsupporting

confidence: 88%

Section: Changes In Lowland Paddy Soils In Peninsular Malaysia After the Green Revolutionsupporting

confidence: 84%

Section: Soil Sampling and Analysismentioning

confidence: 99%

Section: Soil Sampling and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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