Effects of combined application of organic manure and chemical fertilizers on the yield and quality of overwintering tomato in the Huanghuai area in China

This study was conducted to determine the effects of combined application of organic manure and chemical fertilizers on the plant growth and yield and quality of overwintering tomato in the Yellow River-Huaihe River Area. The results showed that reasonable incorporated application of organic and chemical fertilizers was beneficial to the growth of tomato plants. In the first four weeks,the tomato plants growth of H3 and H4 was all around better than that of H1 and H2,which was opposite in the sixth week; appropriate proportion of organic and inorganic fertilizer application could obviously increase the yield and economic benefit of the tomato,and the yield of H5 was 14. 47% higher than that of the CK; increasing organic fertilizer proportion can obviously increase the content of lycopene and Vc in tomato fruits,and could cut down the content of organic acid,nitrate and nitrite; the moderate increasing of potash could improve the early growth of tomato plants and increase the confent of tomato soluble sugar,organic acid and Vc; the content of lycopene showed a trend of decrease with the in- crease of the potassium fertilizer; under the test conditions,with comprehensive consideration,H5( organic manure N: chemical fertilizers N = 1∶1 and N- P- K = 1∶1∶1.5) fertilization formula was conducive to the overwintering tomato production in Huanghuai region in China.