Based on the theory of ecological crop nutrient deficiency and compensation effect. the nitrogen (N) deficiency at tillering stage and N compensation at young panicle differentiation stage in rice (Oryza sativa L. ) was selected to study. Four N treatments were treated. https://www.jmannino.com/quick-save-Canon-imageCLASS-MF227dw-Monochrome-Multifunction-Laser-Printer-great-choice/