Effect of Bio-inoculants and Organic Fertilization on the Macronutrient (N, P, K) Content of Eggplant (Solanum melongena L.) Leaves

• Ammar H. Madi (1) Jawad A. K. (2)

  Author

The experiment was carried out during the growing season of 2024–2025 in a plastic greenhouse  at  Al-Musayyib  District, Al-Mashrooa  area  of  Babylon  Governorate in a private  agricultural field in Hilla city (32047'00"N, 44019'00"E). This was a three replication  Randomized Complete  Block  Design (RCBD) experiment. In sandy loam soil, the Least  Significant  Difference (LSD) was used to compare the means for treatment at a 5% level of probability. The objective of the study was to study the effect of  bacterial  biofertilizers ( Azotobacter vinelandii and Bacillus subtilis) as well as the four levels of application of compost organic manure (0, 1, 2, 3 tons per hectare) on the  leaf  nitrogen (N), phosphorus (P), and potassium (K) content. At the flowering  stage, the  results  indicated  that  the  treatment  with the three –way interaction between the study factors in the  proportion  of 3 t  ha^-1 of A. vinelandii, B. subtilis or compost  presented significant values for the contents of N, P and K, in mg per kg of dry matter: 7.8900, 0.6000 and 4.6100, respectively. The treatment with  A. vinelandii was followed  by  the  treatment  with  A. vinelandii + compost at 3 tons per hectare, which was the best in all traits except leaf P content, where the combined biofertilizer treatment ( A. vinelandii + B. subtilis ) recorded the value highest .

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