Differences in Tolerance to Low-Potassium Supply among Different Types of Cultivars in Cotton (Gossypium hirsutum L.) Effects of potassium-deficiency on photosynthesis and energy dissipation in different rice cultivars Plants Adapt to LongTerm Potassium Deficiency by Accumulation of Membrane Lipids in Leaves and Maintenance of Lipid Composition in Roots Morphological and Physiological Disorders of Cotton Resulting from Potassium Deficiency Leaf growth and development of maize in response to K supply Effects of potassium stress on allelopathic potential of rice (Oryza sativa L.)