TABLE I-Fertilizer experiments on various types of soil, with special reference to the effects of lime. Also lime content and

GREEN MANURING

Green manuring may be defined as the enriching of the soil by means of green crops turned under. It has given rise to a rational method of farming without live stock, the fundamental principles being, (1) the application of fertilizers containing phosphoric acid and potash, and lime if necessary, in sufficient amounts to keep the soil well supplied; (2) the production of a legume to be turned under, so that both the nitrogen and humus supplies may be maintained; (3) a money crop which can be sold off the farm.

The subject is one that merits the special attention of market gardeners and truck growers, but may also be considered in general farming under the present conditions found in the State. From continued corn and wheat growing the once fertile uplands of the Central Basin have become relatively poor in nitrogen and humus, though frequently still rich in the minerals, so that green-manure crops without the aid of fertilizers may be profitably grown. On the other hand, the Highland Rim uplands and the soils of the Cumberland Plateau demand phosphoric acid and lime, and the Barrens type needs potash also.

The crops used in these special experiments were cowpeas, followed by wheat, both crops being grown each year. The fertilizers were applied previous to the planting of the cowpeas, except in the series on the farm of T. L. Smithson, of Pulaski, in which case the applications were made just before seeding to wheat. The results are presented in Table II.