Abstract A large plot experiment was conducted in a field infested with Verticillium dahliae. The test area of the field was divided into three different cropping systems. Within each cropping system, the treatments were conventional tillage (CT) and reduced tillage (RT) at three irrigation rates (base rate = 1.0B designed to meet 60% of the crop evapotranspiration [ET] needs, and 50% above [1.5B] and below [0.5B] the base rate). Higher microsclerotia densities occurred with CT at the 1.5B rate than with RT at that rate, though densities were similar between tillage treatments at the 1.0B and 0.5B irrigation rates. Wilt incidence and defoliation were not affected by tillage treatment. Yield was higher with RT than CT in the area of the field with a sorghum/cotton rotation (RT lint yield = 1411 kg/ha and CT was 1261 kg/ha) and with a winter wheat/summer fallow/cotton rotation (RT lint yield = 1490 kg/ha and CT was 1306 kg/ha). The continuous cotton with a terminated wheat cover crop had no tillage differences (RT lint yield = 1422 kg/ha and CT was 1380 kg/ha for CT), but the CT treatment with this cropping system had little to no cultivation because of the terminated cover crop. Irrigation rate was more impactful than tillage treatment on Verticillium wilt. The 1.5B rate had higher densities of microsclerotia and incidence of Verticillium wilt than the 1.0B and 0.5B rates. Yield in a semi-arid environment is often a function of irrigation rate, but in a Verticillium wilt field, the severity of wilt at the high irrigation rate affected yield. The highest yield occurred with the 1.0B rate, though it was not significantly (P

中文翻译：

---

耕作制度和灌溉对黄萎病和棉花产量的影响

摘要 在大丽轮枝菌侵染的田间进行了大型小区试验。田间试验区分为三种不同的耕作制度。在每个种植系统中，处理是常规耕作 (CT) 和三种灌溉率下的减耕 (RT)（基本比率 = 1.0B，旨在满足 60% 的作物蒸散 [ET] 需求，高于 [1.5B] 的 50% ] 和低于 [0.5B] 的基本利率）。CT 在 1.5B 速率下发生的微菌核密度高于在该速率下的 RT，尽管在 1.0B 和 0.5B 灌溉速率下的耕作处理之间的密度相似。枯萎发生率和落叶不受耕作处理的影响。在高粱/棉花轮作（RT 皮棉产量 = 1411 kg/ha，CT 为 1261 kg/ha）和冬小麦/夏休/棉花轮作（RT 皮棉产量 = 1490 公斤/公顷，CT 为 1306 公斤/公顷）。终止小麦覆盖作物的连续棉没有耕作差异（RT 皮棉产量 = 1422 公斤/公顷，CT 的 CT 为 1380 公斤/公顷），但由于终止覆盖作物。灌溉率比耕作处理对黄萎病的影响更大。1.5B 率比 1.0B 和 0.5B 率具有更高的微菌核密度和黄萎病发生率。半干旱环境中的产量通常是灌溉率的函数，但在黄萎病田中，高灌溉率下枯萎的严重程度会影响产量。最高产率出现在 1.0B 速率下，但并不显着（P