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Several studies have focused upon the effects of acids such as oxalic, malic, acetic and citric upon plants. While these acids are detrimental to plants in strong concentrations they are often beneficial in low concentrations.
This pdf paper addresses Cactus and Alkalinity
Some more references for further information:
Foliar Sprays of Citric Acid and Malic Acid Modify Growth, Flowering, and Root to Shoot Ratio of Gazania (Gazania rigens L.): A Comparative Analysis by ANOVA and Structural Equations Modeling
Majid Talebi,1 Ebrahim Hadavi,2 and Nima Jaafari1
Foliar sprays of citric acid and salicylic acid alter the pattern of root acquisition of some minerals in sweet basil (Ocimum basilicum L.)
Noushin Ghazijahani,1, Ebrahim Hadavi,2 and Byoung R. Jeong3
Exogenous Application of Citric Acid Ameliorates the Adverse Effect of Heat Stress in Tall Fescue (Lolium arundinaceum)
Longxing Hu, Zhifei Zhang, Zuoxiang Xiang and Zhijian Yang
Citric acid influence on soil phosphorus availability
Sheila Renata Santos, Enilson de Barros Silva, Luís Reynaldo Ferracciú Alleoni & Paulo Henrique Grazziotti
Citric acid in low dilution appears rather useful and cacti seem to respond well to it.
This pdf paper addresses Cactus and Alkalinity
Some more references for further information:
Foliar Sprays of Citric Acid and Malic Acid Modify Growth, Flowering, and Root to Shoot Ratio of Gazania (Gazania rigens L.): A Comparative Analysis by ANOVA and Structural Equations Modeling
Majid Talebi,1 Ebrahim Hadavi,2 and Nima Jaafari1
Foliar sprays of citric acid and salicylic acid alter the pattern of root acquisition of some minerals in sweet basil (Ocimum basilicum L.)
Noushin Ghazijahani,1, Ebrahim Hadavi,2 and Byoung R. Jeong3
Exogenous Application of Citric Acid Ameliorates the Adverse Effect of Heat Stress in Tall Fescue (Lolium arundinaceum)
Longxing Hu, Zhifei Zhang, Zuoxiang Xiang and Zhijian Yang
Citric acid influence on soil phosphorus availability
Sheila Renata Santos, Enilson de Barros Silva, Luís Reynaldo Ferracciú Alleoni & Paulo Henrique Grazziotti
Citric acid in low dilution appears rather useful and cacti seem to respond well to it.