Table 2 Soil clusters formed by grouping fields based on their similarity in soil abiotic properties, along with the number of organic and conventional spring and winter pea fields and roots sampled in each year.
System | Pea type | Cluster | Year1 | N2 | N3 | pH4 | SOM (%) | Sand (%) | Silt (%) | Clay (%) | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2016 | 2017 | 2018 | 2019 | ||||||||||
Organic | Spring | 1 | 2 | 4 | 6 | 3 | 15 | 299 | 6.3 | 1.8 | 67.2 | 22.2 | 10.6 |
2 | 2 | 1 | 0 | 1 | 4 | 78 | 6.5 | 2.7 | 28.2 | 50.7 | 21.1 | ||
3 | 1 | 1 | 0 | 2 | 4 | 64 | 7.0 | 3.1 | 21.3 | 50.8 | 27.9 | ||
Winter | 2 | 3 | 8 | 6 | 4 | 21 | 380 | 6.5 | 2.6 | 18.4 | 59.6 | 22.1 | |
3 | 1 | 2 | 1 | 4 | 8 | 135 | 7.1 | 3.3 | 17.6 | 55.4 | 27.0 | ||
Conventional | Spring | 1 | 3 | 6 | 6 | 4 | 19 | 375 | 6.5 | 2.5 | 62.3 | 25.9 | 11.8 |
2 | 11 | 10 | 7 | 7 | 35 | 690 | 6.5 | 2.6 | 23.1 | 56.5 | 20.4 | ||
3 | 5 | 5 | 6 | 6 | 22 | 439 | 7.1 | 3.0 | 20.5 | 51.5 | 28.0 | ||
Winter | 1 | 0 | 1 | 0 | 1 | 2 | 40 | 6.7 | 2.3 | 62.7 | 24.9 | 12.4 | |
3 | 0 | 1 | 1 | 1 | 3 | 60 | 7.3 | 3.9 | 18.9 | 37.3 | 43.7 | ||
