Comparative study of the effects of two types of organic fertilizers (R1 and R4) and a chemical fertilizer (NPK) on some physico-chemical and biochemical parameters of lettuce (Latuca sativa L.)

Author(s): Yao N’zué Benjamin, Kpata-Konan Nazo Edith, Combo Agnan Marie-Michel, Sossia Kossan Jules, Tano Kablan

The objective of this study was to evaluate the effect of two types of organic fertilizer (R1 and R4) and a commercial chemical fertilizer (NPK) on the nutritional composition of lettuce. For each type of organic fertilizer (R1 and R4), two concentrations were used (30% and 50%, v/v). The treatments [R1 30%, R1 50%, R4 30%, R4 50%, control and chemical (NPK)] were randomly assigned to units of a homogeneous experimental design. Three replicates were carried out per treatment. Twelve parameters were analysed: lipids, proteins, carbohydrates, total sugars, reducing sugars, fiber, moisture, ash, pH, vitamin C, polyphenols, flavonoids. Analyses show that the level of ash is high (1.01 ± 0.03%) in organic fertilizer R4 50% compared with chemical fertilizer (0.50 ± 0.02%) and the control (0.81 ± 0.08%). The results also showed a remarkable increase in antioxidant compounds (polyphenols and flavonoids), fiber and carbohydrates in lettuce fertilized with organic fertilizer R4 50% (polyphenols: 87.18 ± 0.74 mg/100 g, flavonoids: 1.44 ± 0.01 mg/100 g, fiber: 3.23 ± 0.14% and carbohydrates: 8.03 ± 1.64%) compared with the chemical fertilizer (polyphenols: 14.13 ± 0.33 mg/100 g, flavonoids: 0.82 ± 0.04 mg/100 g, fiber: 2.04 ± 0.10% and carbohydrates: 5.12 ± 0.05%) and the control (polyphenols: 55.80 ± 0.53 mg/100 g, flavonoids: 0.98 ± 0.01 mg/100 g, fiber: 2.39 ± 0.07% and carbohydrates: 5.27 ± 0.29%). The high amounts of phytochemicals, minerals and antioxidants recorded in this research give preference to the use of organic rather than inorganic fertilizers. In view of the results obtained, organic fertilizer R4 50% should be recommended to market gardeners.



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