Answers are grounded in this paper and cite their sources.
A selective applicator for post>emergence herbicides in row crops was developed and tested. Weed competition is sensed using a modulated, NIR light source and phototransistor receiver. A logic circuit for activating a solenoid valve at the spray nozzle was also constructed. Preliminary results indicate herbicide savings of 15% with no adverse effect on weed control.
No takes yet. Share an insight, caveat, or question.
Shearer et al. (1991) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: