High Potassium Application Rate Increased Grain Yield of Shading-Stressed Winter Wheat by Improving Photosynthesis and Photosynthate Translocation

Wheat (Triticum aestivum L) production in Huang-Huai Plain of China has been substantially affected in the past 50 years as a result of the decreasing total solar radiation and sunshine hours. Five potassium application rate (K), 0 (K0), 50 (K50), 100 (K100), 150 (K150) and 250 (K250) mg K2O kg-1 soil, combined with two shading levels, no shading (NS) and shading at early filling stage for 10 days (SE), were randomly designed and conducted by...