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Combined Influence of Manure and Fertilizers on Nutrition and Yield of Maize (Zea mays): Impact on the Diagnosis of Primary Soil Deficiencies. A trial was carried out at Centre National de Recherche Agronomique (CNRA) station in Man, in order to study the effects of combined application of fertilizers and manure on the soil fertility, yields and nutrition of corn (Zea mays). Three doses of fertilizers and five amounts of manure were tested. Combination of levels' factors corresponds to fifteen treatments. Results show that manure is the engine of the improvement of soil fertility, nutrition and yields. All chemical characteristics of the soil have been improved, notably phosphorus, calcium and the total of exchangeable base cations. Impacts of these changes on soil' fertility, plant nutrition and performance have been established. A significant increase in the absorption of phosphorus and yield, due to manure, is observed. Soil phosphoric nutrition and yield of maize are related to the dose in the soil of each of these crucial nutrients by a quadratic production function. The ignorance of factors, that limit nutrition and production, maintains a low yield levels. Correction of deficiencies by a fertilization formula, adjusted to the soil and crop, restores productivity. Organic soil maintenance is an appropriate solution to the problems of the farmer. |
