5YIN L C,CAI Z C,ZHONG W H.Changes in weed composition of winter wheat crops due to long-term fertilization[J].Agriculture,Ecosystems and Environment,2005,107:181-186.
6CROWLY P H.Natural selection and the Michaelis constant[J].J.Theor.Biol.,1975,50:471 -475.
7CACOO G,FERRARI G,SACCOMANI M.Pattern of sulfate uptake during root elongation in maize:its correction with productivity[J].Physiol.Plant,1980,48:375-378.
8EPSTEIN E.A kinetic study of the absorption of alkali cations by barley roots[J].Plant Physiol.,1952,27:457 -474.
