Field plot trials with amaranth

brassica chinensis

and eggplant involving 6different fertilization schemes including non-fertilizer

chemical fertilizer

optimal fertilizer(combined chemical fertilizer and organic manure)

organic manure

increased N fertilizer

increased P fertilizer

were conducted under natural rain-fed condition to investigate the effects of the fertilization schemes on yield

as well as N accumulation

nitrogen fertilizer utilization rate

and loss of N by surface runoff.The results show that compared with nonfertilizer

the other 5fertilization models can increased yield of 93.55%

103.74%

96.68%

130.78%and 136.04%

respectively.With different fertilization

the loss of total N by surface runoff varied between 68.11~92.10kg/hm2.Compared with the chemical fertilization

organic fertilization and optimum fertilization could decreased total N loss by 4.67%and 2.02%respectively.Compared with the optimal fertilizer

increasing N and P fertilizer could increase the amount of total N loss respectively by 10.53%and 8.28%. Therefore

the fertilizer ratio should be improved to effectively reduce nitrogen loss on vegetable lands.With steady inputs of N and P

organic fertilizer should be increased while chemical fertilizer should be reduced.