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This article in JEQ

  1. Vol. 20 No. 2, p. 373-380
     
    Received: Apr 23, 1990
    Published: Apr, 1991


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doi:10.2134/jeq1991.00472425002000020007x

Lysimeter Study of Nitrogen Fertilizer and Irrigation Rates on Quality of Recharge Water and Corn Yield

  1. Lyle Prunty * and
  2. B.R. Montgomery
  1. Department of Soil Science, North Dakota State Univ., Walster Hall, P.O. Box 5638, Fargo, ND 58105.

Abstract

Abstract

Accrual of NO3-N to groundwater as a result of agricultural practices is a focus of environmental concern. This inquiry was conducted to quantify precisely in a replicated experiment the rate of N loading to groundwater resulting from inputs of N and irrigation water to corn (Zea mays L.). Input levels were designed to balance potential for high production with minimum loading of NO3-N to groundwater. Four large (2.4 by 2.4 m and 2.3 m deep) drainage lysimeters with reconstructed Hecla loamy fine sand (Aquic Haploborolls) were employed in this southeast North Dakota study. Grain yields at N fertilizer rates of 95 and 145 kg/ha were 10.3 and 11.3 Mg/ha, respectively. Differences in yield due to irrigation and irrigation by N interaction were nonsignificant. There was no residual effect of N fertilizer on yield. The higher irrigation rate caused increases in drainage of water within about 30 d. The higher rate of N fertilizer, however, was not reflected by increased concentration of NO3-N in the drainage water until 325 d after application. The increased concentrations then persisted to 500 d. Flow-weighted means of NO3-N concentrations for this period were 8.6 and 12.3 mg/L for the low and high N rates, respectively. For this soil and climate, irrigation and N management can be tailored to produce NO3-N concentrations below 10 mg/L with continuous corn. However, the 5:1 economic return produced by 50 kg/ha of incremental N fertilizer means that producers are unlikely to adopt the needed practices without incentives.

Contribution of the North Dakota Agric. Exp. Stn. Journal no. 1888.

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