Sudan Grass. 7 in the southern Great Plains its yield is nearly twice that of millet. The yield of sorgo in drilled or broadcast secdings averages in each region, except the timothy and clover belt, about 1 ton more hay per acre than Sudan grass. This is partly because of the larger amount of moisture in the sorgo hay, due in a measure to the greater difficulty of curing its coarse stems. Any difference in the actual yield of dry matter is oiïset in some degree by the better quality of the Sudan grass hay.

VALUE IN IRRIGATED REGIONS.

In many of the irrigated parts of the West where alfalfa is the principal crop and dairying the chief industry of the people, alfalfa has been made the constant and the almost complete diet of the cows.

FIG. 4.—A plat of Sudan grass (atleft) grown beside a plat of Kursk millet at Ecdfleld, S. Dak., 1916.

Both crops are in approximately the right stage to be cut for hay.

The continuous use of this high-protein hay has caused digestive troubles, but this derangement of the digestive functions seems to disappear promptly when the feed is changed. Under irrigation south 01 Oregon and Wyoming Sudan grass makes an excellent crop to grow for mixing with alfalfa. Yields of cured hay obtained under irrigation in California and Arizona have been equal and in some cases larger than those from alfalfa. At Chico, Calif., Sudan grass when irrigated gave a yield of 9.8 tons of cured hay per acre, as compared with a yield of 8.3 tons of alfalfa hay; and at Bard, Calif., in the extreme southern end of the State, Sudan grass on favorable soil gave a yield of 8 tons of hay per acre, as compared with 7.9 tons of alfalfa. The yield of 8 tons at this place was obtained from grass planted almost a month later than it should have been. At Phoenix, 16439°—30 2