A research on the growth status of Trifolium repens and it's influences on soil nutrients was performed through measuring its biomass and growth factor

as well as soil organic matter

total N

total P

total K

hydrolytic N

available P

and available K.The land without fertilizer application and with successive cutting within two years was selected

and each time

all Trifolium repens above soil was harvested for the experiment.The research indicates that with the increasing harvesting time

the fresh and dry weight of Trifolium repens

its average length

and its stem diameter were decreased by 14.34%

13.12%

5.20%

and 3.38% per year

respectively.As for the upper layer soil

its organic matter varied from 24.37% to 8.75%.Its total N

total P

and total K were not apparently affected

but its available P

available K

and hydrolytic N were greatly affected

which were decreased by 46.56%

43.63%

and 16.69% in the two years

respectively.As for the bottom soil

changes in organic matter

total N

total P

and total K were like those in the upper layer soil

but its available P was greatly decreased compared with hydrolytic N and available K.Comprehensive analysis demonstrates that increasing harvesting time may lead to the decreases of soil fertility and productivity.Therefore

for a sustainable development

it is necessary to apply a certain amount of compound fertilizer

phosphorus fertilizer

and potassium fertilizer to the soil after successive cutting.