A laboratory method to estimate the efficiency of plant extract to neutralize soil acidity

Brazilian Archives of Biology and Technology

Marcelo E. Cassiolato¹  Mário Miyazawa¹  Anderson R. Meda¹  Marcos A. Pavan¹ 

[1] ,Instituto Agronômico do ParanáLondrina PR ,Brasil

关键词: Plant residue;    organic acid;    plant alkaline index;   

DOI  :  10.1590/S1516-89132002000200009

来源: SciELO

【 摘 要 】

Water-soluble plant organic compounds have been proposed to be efficient in alleviating soil acidity. Laboratory methods were evaluated to estimate the efficiency of plant extracts to neutralize soil acidity. Plant samples were dried at 65ºC for 48 h and ground to pass 1 mm sieve. Plant extraction procedure was: transfer 3.0 g of plant sample to a becker, add 150 ml of deionized water, shake for 8 h at 175 rpm and filter. Three laboratory methods were evaluated: sigma (Ca+Mg+K) of the plant extracts; electrical conductivity of the plant extracts and titration of plant extracts with NaOH solution between pH 3 to 7. These methods were compared with the effect of the plant extracts on acid soil chemistry. All laboratory methods were related with soil reaction. Increasing sigma (Ca+Mg+K), electrical conductivity and the volume of NaOH solution spent to neutralize H+ ion of the plant extracts were correlated with the effect of plant extract on increasing soil pH and exchangeable Ca and decreasing exchangeable Al. It is proposed the electrical conductivity method for estimating the efficiency of plant extract to neutralize soil acidity because it is easily adapted for routine analysis and uses simple instrumentations and materials.

【 授权许可】

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