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The Contribution of Commercial Fertilizer Nutrients to Food Production

^a Potash and Phosphate Inst., 2423 Rogers Key, San Antonio, TX 78258
^b Potash and Phosphate Inst., 655 Engineering Dr., Suite 110, Norcross, GA 30092
^c Rothamsted Research, Harpenden AL5 2JQ, England
^d Dep. of Soil Sci., Box 7619, North Carolina State Univ., Raleigh, NC 27695-7619

View larger version (23K): [in a new window]   Fig. 1. Wheat yield attributable to inorganic N and P fertilizer from N plus P treatments from 1930 to 2000 in the Oklahoma State University Magruder plots.

View larger version (24K): [in a new window]   Fig. 2. Wheat yield attributable to nutrient inputs from 1889 to 1998 in the University of Missouri Sanborn Field plots.

View larger version (23K): [in a new window]   Fig. 3. Continuous corn yield attributable to N, P, and K fertilizer and lime over 46 yrs in the University of Illinois Morrow plots.

View larger version (26K): [in a new window]   Fig. 4. Winter wheat grain yield attributable to N fertilizer with adequate P and K compared with P and K alone (Broadbalk, Rothamsted). The years between 1921 and 1969 were not included in the summary because part of the experiment was fallowed each year to control weeds. From 1970, the periods shown represent averages for individual varieties until replaced by newer varieties.

View larger version (43K): [in a new window]   Fig. 5. Contribution of fertilizer (N, P, and K) and lime to the yield of 17 consecutive crops (rice, soybean, cowpea, and corn) during 8 yr of cultivation after slash-and-burn clearing of an Oxisol in the Amazon of Brazil.

View larger version (45K): [in a new window]   Fig. 6. Contribution of fertilizer (N, P, K, S, Mg, and micronutrients) and lime to the yield of 33 successive crops of corn (C), soybean (S), and rice (R), during 15 yr (1972 to 1987) of cultivation after slash-and-burn clearing of an Ultisol in the Amazon of Peru.