Nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops

The invention provides a nitrogen fertilizer real-time recommendation method based on canopy coverage and plant height of facility crops, which belongs to the technical field of agricultural plantingand comprises the following steps: subtracting the nitrogen application amount of an optimal nitrogen application planting area from the nitrogen application amount of a non-optimal nitrogen application planting area, counting as Delta F, and calculating the nitrogen fertilizer recommendation index R of the non-optimal nitrogen application planting area at the same time, performing linear regression analysis on the Delta F values and the corresponding R values of all the non-optimal nitrogen application planting areas to obtain a nitrogen fertilizer recommendation formula; after the crops areplanted, monitoring the daily average temperature of the crop growth environment, calculating the nitrogen fertilizer recommendation index R value of the crops before crop topdressing, and substituting the R value into a nitro