Print ISSN: 2077-5822

Online ISSN: 2618-1479

Author : I. Hussein Al���Qaisi, Ali

The Use of Infrared Technique in the Study of Mica Weathering in the Rhizosphere Soil and Bulk Soil Under Different Plant Covering.

Salman K. Essa; Ali I. Hussein Al–Qaisi

Al-Qadisiyah Journal For Agriculture Sciences, 2018, Volume 8, Issue 1, Pages 80-91
DOI: 10.33794/qjas.2018.162657

Three soil sites are chosen in the holy governorate of Kerbala / Al-Husseiniya region, for three types of trees (Morus, palm, and Citrus aurantium). Soils are characterized by similar texture, parent material, topography, climatic conditions and equal rainfall, in order to study the effect of biochemical activities in rhizosphere on weathering of mica and compare it with Bulk soil, by using of infrared technology.
Results of IR spectrum inspections for Bulk soil show that the absorption spectra at wave length 1500-1650 cm-1 representing a zeolite water, with varying degrees of widens, reflecting the variation in degrees of clay minerals hydrolysis in these soils. In general the rhizosphere clay of Morus trees show the widest range of this absorption spectra, followed by the rhizosphere clays of Palms and Citrus aurantium trees respectively. The results show a presence spectrum of 3000-3800 cm-1 representing the substitution of Al3+ for Si4+ in tetrahedra sheet of mica, and the increasing width of this spectrum reflect more substitution of Al3+ for Si4+. Results show that the lowest width of this spectrum is found in rhizosphere soil of Morus trees, reflecting a high proportion of smectite in this soil.
The low abundance of 1500 - 1650 cm-1 spectrum in Bulk soil of all trees, indicates the low degree of hydrolysis of the clay minerals in these soils. Also, the result show that the narrow spectrum range 1000 - 1050 cm-1, is found in all Bulk soils, which confirms the decline of transformation process of mica towards the 2:1 minerals in these soils..

A Comparative Study of the Properties of Mica in Rhizosphere and Bulk Soil Under Different Plant Covering.

Salman K. Essa; Ali I. Hussein Al–Qaisi

Al-Qadisiyah Journal For Agriculture Sciences, 2018, Volume 8, Issue 1, Pages 92-105
DOI: 10.33794/qjas.2018.162658

Results of x-ray diffractions for Bulk soil, represented by the horizontal distance 50H, show the presence of low-crystalline chlorite, smectite and regular interstratified chlorite- smectite in soil under Citrus aurantium trees. Re sults of clay sample in soil of palm tree show a presence of smectite and swelling chlorite, while the presence of the interstratified minerals is very low. Also the results show a presence of swelling chlorite, smectite and Biotite in soil of Morus trees. Generally, the results show that the process of mica transformation into 2:1 minerals in the Bulk soil, is very weak.
The x-ray results show that the rhizosphere soil(0) of Citrus aurantium trees content is smectite and mica, with regular interstratified mica-smectite, while the results show the presence of smectite, chlorite, and regular interstratified chlorite- smectite and mica-smectite, in rhizosphere soil of palm trees. As well as the inspection of clay samples of Morus trees, show the presence of chlorite and smectite with two types of interstratified minerals, irregular smectite-mica and regular mica-smectite.
In general, the results of x-ray show that the transformation process of mica to 2:1 expandable minerals in rhizosphere soil exceeds the Bulk soil of all type of trees. While the superiority of mica weathering, and increase of Smectite content in all rhizosphere soils are taken as in the following sequence:
Morus trees soil > Palm trees soil > Citrus aurantium trees soil