Properties and Management Implications of Soils Developed From Volcanic Ash in North Sulawesi

Edi Yatno • Hikmatullah Hikmatullah • Muhammad Syakir
Journal article Indonesian Soil and Climate Journal • 2016 Indonesia

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(English, 10 pages)

Abstract

. Soils formed from volcanic ash have unique properties and are among the most productive soils for agricultural use worldwide. The purpose of this study was to characterize mineralogical, physical, and chemical properties of volcanic ash soils. Four soil profiles developed from volcanic ash in North Sulawesi were described, sampled, and analyzed for their mineralogical, physical, and chemical properties. Results revealed that sand mineral composition was dominated by opaque, volcanic glass, labradorite, augite, and hypersthene followed by hornblende and olivine, whereas clay minerals were dominated by allophane and hydrated-halloysite. The mineral composition indicated that the soils were developed from andesitic to basaltic volcanic materials. Soil morphological characteristics were dark colors, weak to moderate sub-angular blocky structure, and friable to very friable consistency. The soils showed coarse to medium texture with sand content of > 40%. The bulk density ranged from 0.79 to 1.19 g cm-3 and water retention at 1,500 kPa were generally low to medium (6.3-18.5%). The soil reaction in the upper horizons was acid to slightly acid and pHH2O and pHNaF values ranged from 4.8-6.5 and 9.1 to 12.3, respectively. The soil organic carbon content and cation exchange capacity were low to high, while base saturation was moderate to high. Two soil profiles (P1 and P3) met the criteria of andic properties and are classified as Andisols. However, the other two profiles (P4 and P2) just met the criteria for vitrandic soil properties at subgroup level of Inceptisols and Entisols. All the studied soils are highly potential for agricultural production. However, some soils exhibit low organic carbon content and high P retention. Therefore, land management should be directed for increasing organic matter content and availability of P nutrient.

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Indonesian Soil and Climate Journal

Jurnal Tanah dan Iklim contains the results of research in the field of land and climate from res... see more