Why do farmers fill their fields with water?

Answer 1

A farmer should only really roll a field no later than March as the ground gets too hard in april to flatten out, also you won't destroy any ground nesting birds nests in March. Normally as a rule of thumb the second week in March is dry enough to roll.

Heavy rolling is used to press down muck flat so it won't get into a forage crop, to press down stones that could damage a mower and to flatten down any mole hills or soil in general that could also get into a forage crop and kill live stock.

Rolling can make grass tiller which in theory should produce more grass. However heavy rolling can knock grasses growth back for a week or so.

Having said that some farmers roll regardless as it looks good and their farther used to do it.

Answer 2

They rotate their crops to utilize bacteria to increase nitrogen in the soil.

because diffrent crops take up diffrent nutrients so they are rotated to ensure they have a good supply of the right nutrients

Answer 3

they roll grass fields so that tillering can happen which is so that the grass spreads out and it encourages more to grow.