Spending taxes and "The "Reagan Revolution" focused on reducing government spending, taxes, and regulation. ... This theory says tax cuts encourage economic expansion enough to broaden the tax base over time. ... Reagan doubled the number of items that were subject to trade restraint from 12 percent in 1980 to 23 percent in 1988."
It turns the top soil and any remains crop over, producing fertilizer. It breaks up the soil for easier planting. By turning over the soil, weeds are reduced. Hope this helped!