"A shortage of grain feed is a common occurrence on the farms in the San Antonio district of Texas. This results from planting an insufficient acreage of grain crops and from the fact that farmers rely too much upon Indian corn for grain production. Corn produces a relatively small yield per acre under conditions existing in this district and a complete failure of the crop often occurs. A grain crop that is more dependable than corn is urgently needed. Experiments at the San Antonio Field Station during the past eight years indicate the possibility of making grain sorghum a successful crop in that district. Grain sorghum is a much surer crop in unfavorable years than corn, and it yields fully as much feed in favorable years. The principal reason why grain sorghum has not been more extensively planted in this district is its frequent failure to produce grain, due to blasting or sterility. This blasting is caused by a small gnatlike fly, the sorghum midge. The results of the observations and experiments at San Antonio show that by using early varieties and special cultural methods sorghum can be made a dependable grain crop in spite of the midge. The points of special significance to be observed are early seeding and the use of quick-maturing varieties."--Page II

The results of these experiments indicate: First, that the injurious after-effect of sorghum is due to the presence of a toxic body formed during the decomposition of the stubble. Second, that this toxic body is shortly volatilized or decomposed. Third, that during the decomposition of the stubble, and while the toxic body is still in the soil, the flora that generates the carbon dioxide is, to a large extent, killed off. Fourth, that with the cessation of the evolution of carbon dioxide, a new equilibrium is established in the soil, in which the sodium zeolite exists in excess over the calcium salt. This causes a deflocculation of the soil.