Show crop rotation as valuable as amure and fertilizers in the practice of crop rotation a farmer has at bis his command a means whereby hereby be can materially reduce acre costs or increase the output ot of his land gay says W IV weir associate soil technologist ot of the united states Devart mant ot of agriculture perhaps that butet Is not news to many farmers who bare have been using rotation in their crop system they know it Is a beneficial pt pim tice they may be surprised however say bays mr air weir to learn that crop I 1 rotation Is nearly as effective in ln in creasing soil productivity as te use of manure and commercial ers era furthermore crop rotation can be practiced usually with no outlay of money whereas wherein the use ot of commercial fertilizers requires an expenditure pend iture e ot of money A study ot of the lone long continued soli soil fertility experiment ot of this country and ot of england made by the department ot of agriculture has out w abut brov rotation la in ita its rel relation re latton atio to RU la in genrl general an ears mr ur weir the ebow that rota vote ion ton without the uee use ot of manure or of commercial fertilizers la nearly aa as efficient in effecting affecting erba increases luer effee as the usa us ot without to mattot the beneficial effect effects ot of crop rotation are different from the tb benefits derived from the use ot of fertilizers so that when these two farm practices are combined the one practice adds to the benefits of the other making the resultant increase almost twice tice that secured by either practice used alone on eolla molls long under highest yields are possible only when rotation and na the use ot of fefel libers are practiced together |