. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. SOILS AND CROPS DETERMINE KIND OF FERTILIZER 209 crop to be grown are two factors determining largely the kind of fertilizer to use (Figs. 135 and 136). The growing of sugar beets on peat, for example, requires liberal applications of a potash fertilizer. The forcing of lettuce and other garden crops requires an abundant supply of available nitrogen (Fig. 142). The appli- cation of soluble phosphate fertilizer on many soils proves the most profitable fertilizer treatment, especially on lon
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. SOILS AND CROPS DETERMINE KIND OF FERTILIZER 209 crop to be grown are two factors determining largely the kind of fertilizer to use (Figs. 135 and 136). The growing of sugar beets on peat, for example, requires liberal applications of a potash fertilizer. The forcing of lettuce and other garden crops requires an abundant supply of available nitrogen (Fig. 142). The appli- cation of soluble phosphate fertilizer on many soils proves the most profitable fertilizer treatment, especially on long-cropped > prairie soils. The improvement of poor soils generally requires the addition of all the fertilizing Fig. 142.—Making a second application of fertilizer to head lettuce. The fertilizer is scattered along the rows and stirred in. (N. Y.) Mixed or complete fertilizers in comparison with single fertil- izers commonly give the highest average increases and profits. This is particularly true in case of wheat, potatoes and cotton. Frequently a mixture of phosphate and potash gives best results. Many experiments have shown that the full effect of one fertilizing element is obtained only when it is associated with the other two. Moreover, the addition of phosphorus and potassium usually increases the need of nitrogen for bigger crops. In other tests a fertilizer, either single or complete, used in conjunction with a green-manuring crop is the best means to obtain higher crop yields. 14. 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 Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
