Crops Collage (IMAGE) American Society of Agronomy Caption All crops need phosphorus for healthy growth. Phosphorus is a building block of plant protein. Working to reduce, reuse and recycle phosphorus will make a more sustainable food system. Credit Included in photo Usage Restrictions Use with story only License Licensed content 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.