Effects of organic fertilizer (NPK 5-9-19) and mineral (NPK 12-11-18) on soil chemical properties in tomato crop in the South and Mid-west of the Ivory Coast

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.

Soil Acidification in Cocoa (Theobrama cocoa) Agrosystems in Côte d’Ivoire (I): Effect of Carbonate Based Mineral Amendments on Soil Chemical Properties and Growth of Cocoa Seedlings (Theobrama cocoa)

“…The almost zero increase in CEC for all treatments compared to the T0 control may be due to the low levels of cation exchange of the adsorbent complex by the base cations of the amendments. This observation of the effect of Ca-Mg amendment on a ferrallitic soil was early mentioned in the tropics [31]. According to Djongo [32] and Rahajaharitompo [33], the slight CEC value would be linked to the NH4 + ions brought by the ammonium acetate during the determination of the CEC, which could not extract the acid cations (Al 3+ , Fe 3+ and H + ) that are strongly linked to the colloidal complex of the soil.…”