The weight of the water in teh pipe will only affect pressure if the head of water is raised, but that has to do with gravity... if the head of water is lowered volume will also increase.... but so long as the pump rating is adequate for the lift the volume won't change.
You changed the topic, you're talking about pump ratings and wells, not hose length. With your well pump set up volume won't change with a longer hose so long as you're not running it up hill, that your well maintains adequate water volume, and your well pump maintains pressure. But the topic is not about wells and pumps. If you remember my original reply I asked about topograpghy for exactly what you're bringing up. The height water is lifted affects volume, but not the length of run on level ground. You'd probably understand if you've ever siphoned water any appreciable distance, siphoning eliminates frailities of a pump. And you do realize that temperatures affects volume too, higher temperatures cause hose diameter to expand creating a greater cross sectional area, in effect a larger diameter tube... there are other factors that alter volume too but not piping length alone. About two years ago I did a lot of reasearch on this exact topic for irrigating a property in Idaho by pumping water from a pond... there were several problems due to the hilly terrain. In the end several pumps proved inadequate... it was less costly and entailed far less labor by hauling water with a cart. And if the OP wants to irrigate 6 acres I'd definitely recommend a much larger well. I have two wells on my property, the one for my house was tested and delivers
12 gallons a minute, the one that used to be used for irrigating crops delivers 30 gallons a minute. I use the larger well only occasionally, to water my vegetable garden and to fill the buckets I sometimes haul about... I also use it to wash my tractors and whatever else requires large volumes of water.