. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN 756, U. S. DEPARTMENT OP AGRICULTTJEB. moisture supply; and field experiments to determine this matter defi- nitely were begun in the fall of 1915. THE EXPERIMENTS. If it were true that pecan rosette is merely an evidence of star- vation, it might be supposed that liberal applications of mineral fer- tilizers would relieve the condition, but such is not the case. Ex- periments by the United States Department of Agriculture with heavy applications of mineral fertilizers in young orchards located on poor soil, a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN 756, U. S. DEPARTMENT OP AGRICULTTJEB. moisture supply; and field experiments to determine this matter defi- nitely were begun in the fall of 1915. THE EXPERIMENTS. If it were true that pecan rosette is merely an evidence of star- vation, it might be supposed that liberal applications of mineral fer- tilizers would relieve the condition, but such is not the case. Ex- periments by the United States Department of Agriculture with heavy applications of mineral fertilizers in young orchards located on poor soil, as well as the experi- ence of many grow- ers, indicate clearly that rosetted trees generally become worse under such treatment. This point, taken in con- nection with the facts that the native habi- tat of the pecan in the United States is the flood plains of the Mississippi Kiver, its tributaries, and other streams of the South and South- west and that pecans make a uniformly vigorous, healthy growth on these soils, indicated that the fertility to be added should be from organic sources and that the physical condition and water-holding capacity of the soil must be improved in order to overcome the disease. Only by the annual addition to the soil of large quantities of humus- forming material could this result be obtained. PURPOSE OF THE EXPERIMENTS. The experiments were designed to demonstrate the correctness or incorrectness of the view stated above. It was proposed to increase the humus content and the fertility of the soil and thereby to better its physical condition and water-holding capacity as rapidly as pos-. FiG. 3.—The tree shown in figures 1 and 2 after two com- plete seasons. There has been some normal loss of foliage, but striking improvement is evident. October, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly rese
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