Humic Acids, Plant Growth and Nutrient Uptake

Year 2011, Volume: 23 Issue: 1, 46 - 56, 04.12.2011

Şener Akıncı

Abstract

Humic acids are defined as heterogenic natural resources that have colours changing from yellow to black,high molecular weight and resistance to decay. They can be found, in varying concentrations in such sources as turf, peat-bogs, animal fertilizers, lignites and leonardites. Humic acids have an essential role in agricultural processes. Increasing cation exchange capacity (CEC) and enhancig soil fertility, they promote the mineral nutrients into forms available to plants. Humic acids help to retain water-soluble inorganic fertilizers in the soil, releasing them as needed for the growing plants. In particular, humic substances decrease the negative effects of chemical fertilizers.

Keywords

Humic acids, plant growth, nutrient uptake

Hümik Asitler, Bitki Büyümesi ve Besleyici Alımı

Abstract

Hümik asitler renkleri sarıdan siyaha değişen, bozulmaya dayanıklı, yüksek moleküler ağırlığa sahip, heterojen doğal kaynaklar olarak tanımlanırlar. Torf, turbiyer, hayvan gübreleri, linyitler ve leonardit gibi kaynaklarda değişik konsantrasyonlarda bulunabilirler. Hümik asitlerin tarımsal işlemlerde önemli rolleri vardır. Katyon değişim kapasitesini (KDK) artırırlar ve toprak verimliliğini yükseltirler; böylece mineral besleyicileri bitkiler için alınabilir hale getirirler. Humik asitler, toprakta suda-çözünebilir inorganik gübreleri muhafaza ederek, büyümekte olan bitkilere gerektiği kadarını serbest bırakırlar. Hümik maddeler özellikle kimyasal gübrelerin olumsuz etkilerini azaltırlar.

Keywords

Hümik asitler, bitki büyümesi, besleyici alımı

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