Journal Article 2 root foraging behavior 2 Helianthus annuus 1 Research Support, Non-U.S. Gov't 1 Soil 1 coastal plain species 1 digital image correlation (DIC) 1 mehr ... interspecific competition 1 intraspecific competition 1 phenomics 1 precision 1 root architecture 1 root distribution 1 root phenotyping 1 root placement 1 scale 1 sensitivity 1 spatial nutrient heterogeneity 1 weniger ...