A couple of weeks ago we were visiting a winemaker near Richelieu, and Susan commented to me that it was interesting that between the vines they had mowed one alley, ploughed the next, mowed the third, etc.
A couple of days later we were at a winemaker near Cheverny and I noticed they had done the same thing. It seems a weird thing to do: we have seen vineyards where they plough between the rows using horses, and vineyards where the grass is mown, but alternating the two is new to us. There's a reason for all this mowing and hoeing: reducing the grass and flowers between rows reduces the likelihood of a micro-climate that enables fungus, and reduces competition for sunlight and water.
But why alternate? The ploughed strip allows any rain to soak immediately into the ground, the mown section stops it evaporating immediately once it's soaked in.