Study on "3414" Fertilizer Efficiency Test of Alpine Cabbage Cultivar Jingfeng No.1

Taking Jingfeng No.1 cabbage as test material,we carried out the 3414 fertilizer efficiency test to study the effects of different fertilizer proportions on the cabbage yield in the producing area with the altitude of 1 645 m in Lichuan.The results showed that,while no fertilizer was applied,the cabbage yield was 3 790 kg/667 m2,and the relative yield was66.50%.The combined use of nitrogen,phosphorus and potassium fertilizers could significantly increase cabbage yield,and while the application amounts of N,P2O5 and K2O were 15.0,4.8 and 8.5 kg/667 m2,the cabbage yield was 5 699 kg/667 m2.The three treatments,lack of nitrogen,phosphorus and potassium fertilizer respectively,possessed the relative yields of73.73%,92.42% and 82.33%.The curve equations between nitrogen fertilizer application amount and yield,phosphorus fertilizer application amount and yield,potassium fertilizer application amount and yield were y=4 119.7+166.75x-5.195 6x2(R2=0.884 7*),y=5 156.6-13.312x+11.936x2(R2=0.411 8) and y=4 640.9+183.05x-9.010 4x2(R2=0.909 8*) respectively.The curve equations between both nitrogen and phosphorus fertilizer application amounts and yield,both nitrogen and potassium fertilizer application amounts and yield,both phosphorus and potassium fertilizer application amounts and yield were YNP=6 344.76-18.46N-537.81P-3.97N2+17.27P2+32.07NP(R2=0.832 4*),YNK=4 577.34+64.02N-32.40K-3.64N2-1.80K2+7.41NK(R2=0.983 2*),and YPK=4 353.66+11.79P+132.42K+12.16P2-4.46K2-3.16PK(R2=0.736 7*) respectively.The curve equation was YNPK=3 815.6 +63.8N-113P +234.7K-5N2+7.6P2-5.9K2+19.8NP-0.34NK-20.8PK between the application amounts of nitrogen,phosphorus and potassium fertilizers and cabbage yield.