Show ILDER expound ALFALFA SOIL BUILDER great value crop increase nitrogen content land great virtue alfalfa increase nitrogen content soil professor colorado agricultural college 77 per cent air nitrogen every acre lana lana land worth present rate 18 per pound taken air soil minute bacteria live found alfalfa bacteria measure inch take nitrogen air life give tip alfalfa plant another form alfalfa large amount nitrogen soil bacteria collect left follow soil soil too wet bacteria too hard air nitrogen cannot get add nitrogen soil alfalfa alfalfa sweet white g |