Relationship between microstructure and degree of hardening of air-dried maji-soils under different pH conditions

Kubotera, Hideo

doi:10.1080/00380768.2004.10408477

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…We investigated the factors other than texture that influenced the hardening and found that soils with high pH(H 2 O) became harder than low-pH soils (Kubotera 2001(Kubotera , 2003(Kubotera , 2005(Kubotera , 2006a. There was no difference in the clay mineral composition, the content of fine clay, and soil micromorphology between alkaline and acidic soils (Kubotera 2004). Addition of alkaline solution or calcium chloride to acidic soils, which caused increase of pH value or exchangeable calcium content, enhanced the degree of hardening.…”

Section: Degree Of Hardening Of Mahji Soils and Relationship With Soimentioning

confidence: 99%

Analysis of problems in certain soils of the Kyushu Okinawa region for suitable management

Kubotera

2019

Soil Science and Plant Nutrition

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Soils in the Kyushu Okinawa region with problematic properties for agriculture were studied and the following findings were obtained. 1) Mahji-soils in Nansei Islands became very hard with desiccation under high-pH conditions; therefore, soil treatments that cause alkalinization such as overliming should be avoided. 2) In contrast to the generally favorable effects of organic matter on the physical properties of soil, the application of manure compost at 100 Mg ha −1 to Mahji-soils increased the degree of hardening with desiccation. 3) Application of clinker ash (coarse fraction of coal ash) at 10% (wt/wt) mitigated the hardening and shrinkage of Jagaru, a heavy-textured gray soil found on Nansei Island. 4) Non-allophanic surface horizons with strong acidity were widely distributed in the Andosol area of central Kyushu, covering at least 340 km 2. These horizons showed a relatively large ratio of carbon per Al p (pyrophosphate extractable aluminum) and high content of allophane, and began forming around 2500 years ago. 5)Some Andosols in Kyushu showed remarkable hardness. They are divided into two types, according to the degree of weathering and hardening characteristics, and the different measures required to improve each type. 6) An experimental method for determining nitrate retention by soils was developed, and factors influencing the nitrate retention of Andosols were elucidated using this method. 7) A method for micromorphological observation of pelletized manure compost (PC) grains was developed. This method revealed that the internal microstructure of PC did not change in 18 months after compost application, whereas the volume of the grains decreased with the formation of voids around them. 8) As an indicator of soil acidity concerning the countermeasure for common scab, pH(KCl) can easily be used instead of exchangeable acidity y 1, which is laborious to determine. The maximally simplified pH(KCl) measurement method can be carried out by farmers in the field.

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Section: Degree Of Hardening Of Mahji Soils and Relationship With Soimentioning

confidence: 99%

Analysis of problems in certain soils of the Kyushu Okinawa region for suitable management

Kubotera

2019

Soil Science and Plant Nutrition

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“…The objective of this paper is to show the degree of hardening of the Red soils and Yellow soils by this method to elucidate the factors that have influences on the degree of hardening and to make the mechanisms of hardening of these soils clear [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

The Factors and Assumed Mechanisms of the Hardening of Red Soils and Yellow Soils in Subtropical Okinawa Island, Japan

Kubotera

2006

JARQ

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Red soils and Yellow soils in Okinawa Island have the problem of severe hardening in dry conditions. It is important for the improvement and management of these soils to make the factors and mechanisms that affect the soil hardening clear. For this purpose, the properties and the degree of hardening of 43 topsoil samples in upland fields in the central area of Okinawa Island were determined. The results showed that the clay content and pH values were positively related to the degree of hardening. It is well known that clayey soils become very hard by air-drying because of the remarkable shrinkage, however, the pH-dependency of soil hardening has not been reported. Some investigations on the cause of the pH-dependency suggested that some physico-chemical conditions such as charge on the surface of soil particles in high-pH conditions, and the remarkable shrinkage of alkaline soils due to a large amount of calcium ions, enhance the hardening of these soils. The pH-dependency of hardening was also observed in the Red soils and Yellow soils in Kyushu Island, and this phenomenon probably occurs in soils with properties similar to the Red soils and Yellow soils in Okinawa, such as some Ultisols, Alfisols or Inceptisols in tropical, subtropical or temperate regions in the world.

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The influence of changes in physical and chemical properties of surface volcanic deposit on vegetation recovery under conditions of high-concentration volcanic gas from Miyakejima volcano, Japan.

Ogawa¹,

Kurokawa²,

Abe³

et al. 2012

J.Jpn.Soc.Reveget.Tech.

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Relationship between microstructure and degree of hardening of air-dried maji-soils under different pH conditions

Cited by 3 publications

References 3 publications

Analysis of problems in certain soils of the Kyushu Okinawa region for suitable management

Analysis of problems in certain soils of the Kyushu Okinawa region for suitable management

The Factors and Assumed Mechanisms of the Hardening of Red Soils and Yellow Soils in Subtropical Okinawa Island, Japan

The influence of changes in physical and chemical properties of surface volcanic deposit on vegetation recovery under conditions of high-concentration volcanic gas from Miyakejima volcano, Japan.

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