Effect of nitrogen,phosphorus and potassium stress on root vigor and hydraulic conductance of Astragalus membranaceus seedling

Changes in root vigor, hydraulic conductance,and leaf chlorophyll content under nutritional stress were measured and compared in different hydroponic trial treatments of half-Hoagland nutrition (CK) and half-Hoagland nutrition without nitrogen (-N),phosphorus (-P) and potassium (-K) of referenced Astragalus membranaceus seedlings.When compared with full nutrient (CK) treatment,root vigor,root absorption surface area,root hydraulic conductance and leaf chlorophyll content significantly decrease in treatments without N,P and K elements along with significant difference in root/shoot ratio (R/T) between both the control and element-deficit treatments.Specially,both-N and -P treatments most significantly affect root hydraulic conductance.