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Sampling times and materials
| Systems | Samples | Times and materials | |||
|---|---|---|---|---|---|
| February, 2009 | August, 2009 | November, 2009 | January, 2010 | ||
| S1 | Soil | y | y | y | y |
| Crop | n | Maize | Sweet potato | Chinese cabbage | |
| S2 | Soil | y | y | y | y |
| Crop | n | Maize | Ginger | Stem mustard | |
| S3 | Soil | y | y | n | n |
| Crop | n | Rice | n | n | |
y: materials were collected, and n: no materials were collected. S1: soil samples n = 36, crop samples n = 30; S2: soil samples n = 36, crop samples n = 30; S3: soil samples n = 18, crop samples n = 10
