Table 2 Cotton lint and seed yield components in response to different levels of biochar in 2019, 2020 and 2021 at Stoneville, Mississippi, USA.
Year | Biochar rate (t ha−1) | Plant population ha−1 | Plant height (cm) | Number of open bolls ha−1 | Boll weight (g boll−1) | Lint yield (kg ha−1) | Lint yield over control (%) | 100-seed weight (g) | Harvest index | Seed yield (kg ha−1) | Seed yield over control (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
2019 | 0 | 78740d | 69.8a | 541339c | 8.3a | 1189b | 14.7b | 0.33b | 2946b | ||
10 | 83661c | 69.5a | 600394b | 8.0b | 1236a | 3.95 | 14.8b | 0.32c | 3128a | 6.18 | |
20 | 93504a | 68.4a | 531496c | 7.6c | 1184b | -0.42 | 15.0a | 0.34a | 2985b | 1.32 | |
40 | 88583b | 70.5a | 610236a | 7.9b | 1195b | 0.50 | 14.9a | 0.33b | 3147a | 6.82 | |
2020 | 0 | 78898b | 76.9c | 629921c | 8.2b | 1644b | 14.8b | 0.36b | 3780b | ||
10 | 88582a | 78.5c | 708661b | 8.5a | 1703a | 3.59 | 14.8b | 0.36b | 3911a | 3.30 | |
20 | 78493b | 86.7b | 688976b | 8.2b | 1696a | 3.16 | 15.2a | 0.35c | 3821a | 0.92 | |
40 | 86498a | 91.6a | 748031a | 8.3b | 1718a | 4.50 | 15.1a | 0.37a | 3924a | 3.65 | |
2021 | 0 | 83661b | 68.9b | 639764c | 7.4d | 1523c | 15.1c | 0.36c | 3587b | ||
10 | 83661b | 72.3b | 669291c | 7.9c | 1586c | 4.14 | 15.2b | 0.34d | 3652b | 1.81 | |
20 | 88583b | 75.6b | 738189b | 8.2b | 1721b | 13.00 | 15.3a | 0.37b | 3976a | 10.84 | |
40 | 98425a | 88.5a | 816929a | 8.5a | 1854a | 21.73 | 15.3a | 0.39a | 4068a | 13.41 | |
Source of variance | |||||||||||
Year | ** | * | ** | * | ** | * | ** | ||||
Treatment | * | ns | ns | * | ** | * | * | ||||
Year × treatment | ns | ns | ns | ns | ns | ns | |||||
