Determination of nutritional status of cultivated areas in Ahlat district of Bitlis province

Ahlat is taken an important place among places which are cultivated potatoes in Eastern Anatolia. The aim of the study is to determine status of the fertility and plant nutrition through soil and leaf analysis of the most produced potatoes "Granola" in Ahlat. For this purpose, soil and plant samples were taken 40 potato fields in total; 10 different villages and neighborhoods (Güzelsu, Kırklar, İkikubbe, Harabeşehir, Taşharman, Saray, Yıldızlar, Orta, Kurtuluş, Kültür) and 4 farmer fields from each places. Productivity and various nutrient elements were analyzed by using these soil and plant samples. According to the results of the soil samples are generally determined in the group of loamy texture, low amount of organic matters (0.39-1.90%), no salinity problems, neutral- slightly acidic reaction (5.46-7.34) lime according the lime content (1.18-2.36 %). 88% of the sample soils in the resarch was found sufficient-excess for available P amount; 98 % of the sample soils was found sufficient for exchangable K amount. Also 60 % of the sample soils was found sufficient for exchangable Ca amount and 85 % of the sample soils was found sufficient for exchangable Mg amount. The amount of DTPA Mn was found sufficient in 58 % and low in 42 % of the soils while the amount of Fe, Zn and Cu extractable with DTPA in the soil was determined sufficient high. According to the results of the leaf analysis; N, P, Ca, Fe, Mn and Cu amounts of the leaf were found sufficient; K, Mg and Zn amount of the leaf was fount low. According to the results of the soil analysis, it can be said that the organic fertilizer addition would be benefical. Also, although they are sufficient in the soil, low amount of K, Mg and Zn in the plant shows antagonistic relationship between high amounts of nitrogen and phosphorus fertilizer applied.