Effects of lead stress on growth, physiology, and lead ion accumulation and transportation in gramineous forages Effects of Wheat Straw-Residue Applied to Field and Nitrogen Management on Photosynthate Transportation of Stem and Sheath and Grain-Filling Characteristics in Super Hybrid Rice Effects of exogenous pb and cu stress on eco-physiological characteristics on foxtail millet seedlings of different genotypes Effects of Different Cultivation Patterns on Photosynthetic Characteristics and Water Use Efficiency in Dryland Spring Maize