Effects of Different NPK Fertilizer Ratio and Fertilizer Amount on Corn Yield

[Objective] The research aimed to investigate the effects of different NPK fertilizer ratio and fertilizer amount on corn yield.[Method]3414design theory was applied to set corn fertilizer efficiency test in Dongyang experiment fields of JinZhong basin. [Result]The yield of treatment 6( N2P2K2) was the highest,reaching 15 990 kg/hm2,when that of no fertilizer( N0P0K0) treatment reached a minimum value of 10 973 kg /hm2. The difference of yield was significant. Compared with the different dosage of nitrogen and phosphorus and potassium,it found that while the other two fertilizes kept unchanged only increased a single use of another fertilizer,the corn yields increased with the fertilizer at first and then decreased when continued to improve the amount of the fertilizer. Contrasted with the nutrients deficiency treatments,the results showed that the treatment without nitrogen had a notable effect on corn yield. No phosphorus treatment had less effect on corn yield and no potassium treatment had minimal effect on corn yield.[Conclusion]Nitrogen fertilizer was the key factors. It should be a first consideration of the application of nitrogen fertilizer in fields,and should consider fertilizer topdressing proportion at the same time.