I don't know how much right i am with this but my theory was, if i turn the grass upside down i am basically doing what plant doesn't want i.e. what should be under ground is above the ground (roots)and what should be above the ground is facing down (leaves).This means leves wont get sunlight and roots wont get moisture and dry out. i am planing to turn soil every now and then and keep the soil loose therefore if anything(weed,grass,etc) is take hold of soil is disturbed and forced to die. Does this make sense?