Yes, drones can be used to water crops. However, it might not be the most efficient way of irrigating large fields. The drone would need to be large enough to carry a large amount of water, and it would need to be able to fly for a long period of time to cover a large area. Additionally, the drone would have to be able to navigate the field in order to water the crops evenly. Therefore, while it is possible, it would likely be more efficient to use other methods of irrigation.

Yes, but not economical.

Yes but it depends on the size of the farm and also the level of calibration of the drone by the technician.

Yes, you can do that, but I think its not efficient for large areas and not economic method.

With regards.

Start from first principles - i.e. what is the most efficient delivery system of irrigation water to a plant? In general, so water isn't wasted, it is delivered at a specific rate as close as possible to the root system to maximize the usable uptake by the plant ... if the daily amount was delivered all at once, for example, most would be wasted before the plant could absorb it. Depending on the growth rate and type of plant, in many situations a drone would be creating a spray, of which some would evaporate before reaching the plant, then it would land on the leaves where it can't be absorbed, then the soil surface, evaporation again, and then over spray into areas outside of the root system. Ambient atmosphere conditions like wind would also complicate the delivery. But the energy input is the deal killer - water will move itself by gravity in a well planned system, versus the incredible energy intensity require for flying a mass of water around.

Yes, drones save time and costs, provide updated data and images in high resolution for many different purposes and are also easy to use; Which makes it the ideal tool.

Yes.

It will be efficient and economical to use drones to irrigate broad leaf plants because they can drink through their leaves as good as their roots.

Abdelghani Abdelghani INRE: "...they can drink through their leaves as good as their roots"

Really? Could you explain how this happens, and give a citation? Especially in terms of the Cohesion-Tension (C-T) mechanism of the Soil Plant Atmosphere Continuum (SPAC) - see the section "Mechanism Driving Water Movement in Plants" in "Water Uptake and Transport in Vascular Plants", by AJ McElrone, B Choat, GA Gambetta, and CR Brodersen at https://www.nature.com/scitable/knowledge/library/water-uptake-and-transport-in-vascular-plants-103016037/