Abstract
The objective of this study was to evaluate the variations of twelve chemical elements (Ni, Fe, Co, Mg, Mn, Al, Si, Zn, Ti, P, Ca and Cr) in laterite soil profiles from Wantulasi area in South East Sulawesi Province of Indonesia. Eighty four (84) samples of three profiles (i.e. each profile consists of eight samples) had been used to study their variations in soil using the X-Ray Fluorescence (XRF). Results analysis of the chemical elements content in three profile using XRF indicated that there were good correlationsbetween the chemical elements in the soil profile with the significant correlations were found in Ni and Fe, Ni and Si, Ti and P, Fe and Al, and Co and Mn, respectively. On the other hand,the results of study showed that the variations of the chemical elements could be related to the enrichment and translocation of the elements in soil profile and also their possibilities to be related with a given chemical elements in soil profile. Therefore, we suggest that the observed patterns in chemical elements with a good correlation in laterite profile can be used as proxies to integrate the evaluation of the chemical and physical weathering process based on the elements characteristics in soil profiles.
Highlights
Bioassay Technique to Detect Movement of Postemergence Herbicides Paraquat and 2,4-D In Soil
cheap method to detect herbicide residue in soil and water is urgently needed as the quantity and frequency of herbicide usage is steadily increasing in
This study is the third step from a series of studies aim to develop bioassay technique to detect the present
Summary
Penelitian ini merupakan penelitian tahap terakhir dari 3 tahap penelitian yang bertujuan untuk mengembangkan metode untuk mendeteksi keberadaan beberapa herbisida yang paling banyak digunakan di Indonesia dalam tanah dan air menggunakan teknik bioassay yang sederhana, mudah, dan murah, namun tetap akurat. Pada tahap pertama telah dilakukan uji tapis (screening test) untuk menentukan tanaman indikator yang tepat dan penentuan kurva standar bagi metode bioassay yang dikembangkan (Sriyani, 2004; Sriyani et al, 2005). Kurva standar adalah garis hubungan antara pertumbuhan tanaman indikator sebagai tanggap terhadap jumlah herbisida yang diaplikasikan. Pada tahap kedua telah dilakukan uji keakuratan metode bioassay dalam mendeteksi jumlah herbisida dalam tanah dan air (Sriyani, 2007). Sedangkan pada tahap ke-3 ini metode bioassay yang dikembangkan diujicoba penggunaannya untuk mendeteksi pergerakan herbisida dalam tanah. Percobaan dilaksanakan di Laboratorium Ilmu Gulma dan Laboratorium Agronomi, Fakultas Pertanian Universitas Lampung, dari bulan Juli sampai dengan November 2005
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