Balanced fertilization to maximize economic yield of corn under calcareous soil conditions [electronic resource].

Includes references.

This study was carried out at El-Hamam, West Delta, Egypt which was typically sandy loam soil. The experimental location ,vas shaped so as two field experiments could be established both through two seasons (2005 and 2006). Corn var Pioneer was the test crop in the two experiments. The aim of this study was approach a nutrient balance and attained maximum the yield of corn by applying NPK fertilizers to the soil. The obtained results show that the yield parameters of corn, nutrients concentration and uptake by plants were proportional to the rates of NPK during the 1st season. The compound treatment of 100N:50P₂O₅:80K₂O kg/fed surpassed other treatments in all studied corn parameters and produced 8.14 and 3.16 ton/fed of stalks and grains, respectively, in the 1st season. In the 2nd season. NPK rates were modified in a trial to approach a nutrient balance case. The optimum fertilizer treatment 90N:60P₂O₅ : 90K₂O kg/fed increased nutrients concentration and uptake, except for P, when compared with the N₂P₃K₂ 90N : 70P₂O₅:90K₂O treatment. This treatment gave 7.13 and 4.02 ton/fed of corn stalks and grains, respectively. Thus. decreasing N and increasing P and K rates in the 2nd season seemed to offer better nutrient balance to the grown plants and yield. Regression equations were established to help draw fertilizer recommendations for corn under calcareous soil conditions. The results assure that the 90N:60P₂O₅ : 90K₂O kg/fed treatment was the best fertilizer culmination for corn under El-Hamam soil conditions and the like ones.

Summary in Arabic.

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