Table 6 The critical weed free period and time of weed removal calculated from logistic equations for four levels of crop yield loss in 2021 and 2022 expressed in days after crop emergence (DAE) in different cultivation system
From: Cultivation system influenced the critical period for weed control in cotton field
The critical weed free period | The critical time of weed removal | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Time (DAE) for indicated % yield loss | ||||||||||
2% | 5% | 10% | 20% | 2% | 5% | 10% | 20% | |||
Ultra-narrow row | 2021 | 119.1 | 99.5 | 83.3 | 66.3 | 12.6 | 21.1 | 27.2 | 35.6 | |
2022 | 118.2 | 91.4 | 75.3 | 65.4 | 12.9 | 23.5 | 28.5 | 34.6 | ||
Conventional | 2021 | 133 | 102 | 79.2 | 56.4 | 9.25 | 16.9 | 24.5 | 33.4 | |
2022 | 112 | 95.5 | 59.4 | 40.8 | 10.2 | 18.5 | 28.1 | 34.8 | ||