. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. ,/V / wheat" o I o a < 10 S ^ I960 1965 1970 1975 1980 Figure 8. Nitrogen fertilizer use and maize and wheat yields for the United States since 1960. ( Meisinger, USDA, Beltsville) the Northeast, consumption has also been rising, al- though at a slower rate (Figure 9). Grain yields of com have grown during this period (Figures 8, 10, 11), but yield increases have slowed in the past 5 years. Fertilizer N is an important resource in crop pro- duction; however, crops al
. Efficient use of nitrogen on crop land in the Northeast. Plants; Soils. ,/V / wheat" o I o a < 10 S ^ I960 1965 1970 1975 1980 Figure 8. Nitrogen fertilizer use and maize and wheat yields for the United States since 1960. ( Meisinger, USDA, Beltsville) the Northeast, consumption has also been rising, al- though at a slower rate (Figure 9). Grain yields of com have grown during this period (Figures 8, 10, 11), but yield increases have slowed in the past 5 years. Fertilizer N is an important resource in crop pro- duction; however, crops also obtain significant quan- tities of N from other sources. The data in Figures 10 and 11 indicate that Maryland agriculture is more dependent on fertilizer N sources than is Pennsyl- vania agriculture, since the quantity of N applied per unit of yield is greater in Maryland. This situa- tion reflects the greater livestock-based agriculture in. I960 1965 1970 1975 Figure 9. Nitrogen fertilizer use in the northeastern United States. ( Meisinger, USDA, Beltsville). 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 Barker, Allen V. , 1937-. New Haven : Connecticut Agricultural Experiment Station
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