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JOURNAL OF ENVIRONMENTAL PROTECTION AND ECOLOGY, vol.17, no.1, pp.291-296, 2016 (Journal Indexed in SCI)
This study was conducted to evaluate the soil fertility status in Satsuma mandarin (Citrus unshiu M a r c o v i t c h) orchards in Izmir region of Turkey, where mandarin production is very widespread. Research material consisted of soil samples that were taken from a depth of 0-30 cm in 35 orchards as representative of Izmir region. 62.9% of soils showed a neutral reaction and 31.4% were mildly alkaline. While 42.9% of soils showed no problem with salt, 57.1% were mildly affected by salt. It was shown that 54.3% of the soils were calcareous, 94.3% were poor in humus and a silt loam structure dominated in 31.4% of soils. Nitrogen levels were medium in 34.3% of the soils and 54.3% of the soils were adequate in phosphorus. Many of the soils were rich in potassium and a great excess of calcium was found in 2.9% of soils. Mg levels were found to be adequate in 62.9% of soils. No deficiency of Fe, Cu or Mn was found in the soils, but for Zn, 2.9% were deficient, 25.7% showed a risk of deficiency, and 71.4% showed a good level.