Abstract
A study on mineral and organic liquid fertilizer was carried out in the South and Central West of Ivory Coast during a period of two years in order to improve soil fertility in tomato crop. More specifically, it evaluated the effects of 4 doses of organic fertilizer (NPK 5-9-19), associated or not with mineral fertilizer (NPK 12-11-18) on the content of soil organic matter, C/N ratio, the sum of exchangeable bases, available phosphorus, CEC and pH. The experimental design was a split-plot, with four repetitions with mineral fertilizer as the primary factor, and organic fertilizer as secondary factor, at 4 doses (Lha-1): C0 = 0 (control), C1 = 2 5; C2 = C3 = 3.75; and 5. The results showed that 3.75 Lha-1 of fertilizer organic (NPK 5-9-19), associated with the low dose of mineral fertilizer (NPK 12-11-18) had the best positive impact on organic matter, sum of exchangeable bases, and available soil phosphorus. The treatment with 3.75 Lha-1 of organic fertilizer alone increased more CEC and soil pH while the contributions of 2.5 and 3.75 Lha-1 had the advantage of increased C/N ratio of the soil. Key words: Organic fertilizers, mineral fertilizers, chemical property, fertility, soil.  
Highlights
The culture of the tomato constitutes a gainful employment for many producers
The present study aims to determine which amount of liquid organic fertilizer (NPK5-9-19) associated or not with mineral fertilizer (NPK12-11-18) would improve the most, the chemical properties of the soil for a better availability of biogenic salts for the plant and to increase production
The results in 2010 presented in Table 3 show that organic fertilizer (NPK 5-9-19) and the combined effect of mineral fertilizer was significantly improved at the threshold of 5%, soil organic matter content and available phosphorus
Summary
The culture of the tomato constitutes a gainful employment for many producers. Its production worldwide was estimated at 117,000 tons in 2016 with an average output of 37 tha-1 (FAOSTAT, 2016). In Ivory Coast, the total production is of 52,000 tons and the average output is 10 Tha-1 (Minagra, 1993) This poor yield is due to many constraints with which this culture is confronted. The present study aims to determine which amount of liquid organic fertilizer (NPK5-9-19) associated or not with mineral fertilizer (NPK12-11-18) would improve the most, the chemical properties of the soil for a better availability of biogenic salts for the plant and to increase production. This will allow the recommendations of an effective and rational use of organic manure near by the users
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