Calcium Carbonate (image) American Society of Agronomy Share Print E-Mail Caption Extensive calcium carbonate accumulation engulfs this soil layer, making it difficult for plant roots to break through. Credit David C. Weindorf. Usage Restrictions Please use with story only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.