. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. A THIRTY-YEAR FERTILIZER TEST. 139 a cultivated fallow, and in 1912 something which in its effect was prac- tically a fallow. The 1913 com crop therefore had the benefit of two years of soil idleness. In 1914 a crop of soy beans failed to mature, and hence presumably left more of value in the stubble than would have been the case had the crop ripened its seed. In 1916 sweet clover was somti, but the crop appeared to be mostly weeds. This was cut and removed from the soil but not weighed. The corn crops of 1913, 1915 and 1
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. A THIRTY-YEAR FERTILIZER TEST. 139 a cultivated fallow, and in 1912 something which in its effect was prac- tically a fallow. The 1913 com crop therefore had the benefit of two years of soil idleness. In 1914 a crop of soy beans failed to mature, and hence presumably left more of value in the stubble than would have been the case had the crop ripened its seed. In 1916 sweet clover was somti, but the crop appeared to be mostly weeds. This was cut and removed from the soil but not weighed. The corn crops of 1913, 1915 and 1917 therefore are not comparable with the earlier crops, although they may indicate the fertility tendencies as brought about by this abnormal treat- ment. The Hay Crops. There were six crops of grass and clover. One of the most marked results in the whole history of the experiment was the character of the vegetation produced by differential fertihzer treatment on uniform seed- ing. Clovers failed to grow where potash was not applied. The effect of this is shown primarily in the rowen crop, which consisted largely of clover. The number of hay crops was, however, too small and the crop too re- sponsive to varying weather conditions to admit of any very satisfactory interpretation of the data. The graphic presentation (Fig. 2) represents the total yields for the six crops. Plot Tons 7 Manure. HajLj Fig. 2. — South Soil Test. Total yields per acre. Six hay 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 resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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