Overview
This experiment measured nickel acquisition in peanut and choy sum shoots grown in limonitic laterite soil under mono- and mixed-cropping conditions.
Key numbers
Source units are mg/kg. Shoot values are on dry-weight basis (shoots washed, dried at 60 °C for 48 h, then analyzed). Table 1 reports the same values as ppm.
- Limonitic laterite soil Ni concentration: 7.884.
- Monocropped peanut shoots: 20 ± 2, 90 ± 3, and 120 ± 5 in small, medium, and big pots.
- Monocropped choy sum shoots: 51 ± 7, 67 ± 3, and 95 ± 6 in small, medium, and big pots.
- Mixed-cropped peanut shoots: 33 ± 3, 50 ± 5, and 51 ± 4 in small, medium, and big pots.
- Mixed-cropped choy sum shoots: 15 ± 4, 52 ± 4, and 63 ± 5 in small, medium, and big pots.
Methods
Pot experiment at Tadulako University (Palu, Sulawesi Tengah, Indonesia) using limonitic laterite overburden soil from the Sorowako Ni-mining region. Peanut (Arachis hypogaea, seeds inoculated with Rhizobium sp.) and choy sum (Brassica rapa var. parachinensis) were grown in pots holding 0.5, 1.0, or 1.5 kg of air-dried soil under mono-cropping (single species per pot) and mixed-cropping (both species sharing one pot) with four replicates per treatment. Shoots and roots were harvested at the end of the peanut flowering stage (two months after planting), washed with deionized water, dried at 60 °C for 48 h, and weighed. Dried shoots were sent to the BALITTAN laboratory in Bogor for Ni concentration analysis; the paper does not name the analytical instrument. Means were compared by one-way ANOVA with Duncan’s test (p < 0.05) using SPSS 25.
Implications
This is experimental plant-uptake context rather than market-basket occurrence. It is still useful for nickel-contamination mechanism notes in vegetables grown on ultramafic/lateritic soils.
Related evidence
Update history
No substantive edit history is available in this build. The full commit record is available in git.