The effect of lead in hydroponic medium on leaf gas exchanges of two species of aspen and cottonwood. together with some other physiological indices including relative water content. maximum electrolyte conductivity and electrolyte leakage ratio of different organs and efficiency of photosystem II were investigated. One year old saplings of two poplar species were gradually subjected ... https://ashleyshomestores.shop/product-category/3-piece-power-reclining-sofa-chaise/