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The study was done to determine the effect of increasing mycorrhiza application on some biological properties of baby carrot plant. According to the pot experiment results, important increases in some biological properties of baby carrot plant were determined with increasing mycorrhiza applications. The tuber diameter were determined as 9.79 cm, 11.09 cm, 12.58 cm, 13.60 cm, 13.80 cm and 14.25 cm; height of leaf 12.98 cm, 15.11 cm, 15.00 cm, 16.07 cm, 17.79 cm and 16.81 cm; number of leaf 7.11 cm, 7.44 cm, 6.99 cm, 7.89 cm, 7.66 cm and 8.11 cm at I. dose: 0 ml /pot, II. dose: 120 ml / pot, III. dose: 150 ml / pot, IV. dose: 180 ml /pot, V. dose: 210 ml /pot and VI. dose: 240 ml/ pot, respectively. These root diameter and height of leaf increases were determined significant at the level of 5 %, statistically. The effect of mycorrhiza application on number of leaf was not found statistically significant.

The study was done to determine the effect of increasing mycorrhiza application on some macro and micro nutrient element contents of pak choi (Brassica rapa L. subsp. chinensis L.) plant. According to the experiment results, important increases in some macro and micro nutrient element contents of pak choi plant were determined with increasing mycorrhiza applications. The contents were determined as P (0.38 %, 0.42 %, 0.45 %, 0. 49 % and 0.51 %), K (4.01 %, 4.30 %, 4.41 %, 4.56 % and 4.70 %), Ca (1.83 %, 2.01 %, 2.06 %, 2.20 % and 2.36 %), Mg (0.14 %, 0.15 %, 0.15 %, 0.16 % and 0.16 %), Fe (309 mgkg-1, 417 mgkg-1, 678 mgkg-1, 1009 mgkg-1and 1696 mgkg-1), Cu (5.49 mgkg-1, 6.10 mgkg-1, 6.53 mgkg-1, 7.05 mgkg-1and 7.63 mgkg-1), Mn (45.90 mgkg-1, 52.23 mgkg-1, 60.20 mgkg-1, 70.40 mgkg-1and 80.00 mgkg-1) and Zn (32.23 mgkg-1, 35.40 mgkg-1, 37.00 mgkg-1, 40.70 mgkg-1and 46.86 mgkg-1) at I. dose, (control): 0 ml plant-1, II. dose: 15 ml plant-1, III. dose: 20 ml plant-1, IV. dose: 30 ml plant-1 and V. dose: 40 ml plant-1, respectively. These P, K, Ca and Mg contents increases were determined significant at the level of P

This research was done to determine the effect of increasing Humic acid application on some nutrient element contents of cress (Lepidium sativum L.) plant. For this purpose according to randomize block experimental design, an experiment was done with three replications in greenhouse conditions. Cress plant seed was sowed 1.5 g/ m2. Four humic acid doses (I. dose: 0 mL /m2, II. dose: 8 mL /m2, III. dose: 16 mL /m2 and IV. dose: 24 mL /m2) were applied to cress plant. Then cress plants were harvested 30 days after planting. Dry matter yield and some nutrient (N, P, K, Ca, Mg, S, Fe, Cu, Zn and Mn) contents of plants were determined. According to the results, important increases some nutrient element contents of plants were determined with increasing humic acid applications. These increases were found 1. dose 5.52%, and 4. dose 6.04%, for N element, respectively. Other macro elements P (0.70%, and 0. 82%); K (6.85%, and 7.67%); Ca (1.72%, and 2.01%); Mg (0.13% and 0.15%) and S (1.04%, and 1.17%), respectively. Some micro element (Fe, Cu, Zn and Mn) contents of cress plant, 1. dose: 89.86, 9.59, 59.50 and 56.20; 4. dose: 102.17, 11.03, 67.67 and 76.63 mgkg-1, respectively. These increases were found statistically significant at the level of 5% for each nutrient element, except Mg.

The aim of this research was to determine the most suitable extraction method for the available iron contents of calcareous soils in Trakya Region, Turkey. For this purpose ten calcareous soil samples were taken from research area and five extraction methods (Lindsay and Norvell, Wear and Evans, Olson, Soltanpur and Mehlich methods) were used and three biological indices (dry matter yield, Fe concentration, Fe uptake) were compared. The plant biological indices were determined with wheat (Triticum aestivum L.) plant grown under greenhouse conditions. At the end of the experiment, the highest correlation coefficients (r) were determined between the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA, 0.005 M DTPA + 1 M NH4HCO3 methods and the biological indices. The correlation coefficients (r) for the 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA method and the three biological indices were 0.648**, 0.780** and 0.656** respectively. For the 0.005 M DTPA + 1 M NH4HCO3 method, these coefficients were determined 0.595**, 0.637** and 0.625**, respectively. Consequently, these extraction methods were suggested for the determination of the available Fe contents of the calcareous soils in Trakya Region, Turkey.