Effect of potassium rate on yield, potassium uptake and canopy radiation interception of direct-seeded winter canola

Direct seeded canola (Brassica napus L.) has become increasingly popular in China’s key canola-producing regions. The studies on the K response of direct-seeded performance are limited. This research aimed to investigate utilization efficiency and canopy radiation interception rate direct winter at various application rates. Two seasons field trials were done with five levels (0, 75, 150, 225, 300 kg K2O ha-1) utilizing two local cultivars (Huayouza no. 9 Zhongshuang 11) Southwest China. Canola yield rose by 17.9%-82.6% 2017-2018 21.1%-73.6% 2018-2019 when was applied, compared K-unfertilized. go up rapidly first then gradually ingestion grew, demonstrating phenomena luxury consumption. As rose, internal efficiency, agronomic physiological all decreased. In pod development maturation period, 150 ha-1 intercepted most solar (73.8%), while K-unfertilized treatment least (61.6%) average. supply rates had a significant effect absorption canola. When exceeded specific rate, consumption occurred. Canola’s mostly stored pericarp plant stem.