Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Mustafa Ali KAPTAN, Mehmet AYDIN, Seçil KÜÇÜK
Boron (B) toxicity is a significant soil pollution in arid and semi-arid climate regions in the world. The management of boron nutrient in the soil is difficult because of the narrow range between its deficiency and toxicity levels which causes ignificant reduction in the plant yield. Humic substances are major components of organic matter in soil and have an important role improving soil fertility, increasing uptake of nutrients, cation exchange capacity, water-holding capacity and decreasing the negative effects of chemical fertilizers. In this study, we determined the distribution of B in soil profile of a field which had been provided with different concentrations of humic substances (HS) and different levels of B contained water for two consecutive years. These treatments were performed in cotton (Gossypium hirsutum L.Carmen) crop where four B contained irrigation water (0.6–1.8–5.4–16.2 mg B l-1) and three humic substances (0–200–400 kg ha-1) were applied in field in 2011 and repeated in 2012. The total amount of applied water by dripirrigation was 1039.9 mm. The current study was started after the second season of the cotton harvest. The soil samples were taken at 10 cm equal intervals up to 1 m soil depth. The different B treatments with irrigation increased the available B content in soil and showed an accumulation in the upper part of the soil profile. On the other hand, Bleaching was dramatically decreased after plow layer. The humic substance treatments increased the available B contents particularly in the upper part of the soil profile in 5.4–16.2 mg B l-1 treatments. The result of our study impliedthat humic substances do not play a role in the remediation of soil B toxicity.
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accumulation
