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Effect of strip tillage on corn nitrogen uptake and residual soil nitrate accumulation compared with no-tillage and chisel plow



Effect of strip tillage on corn nitrogen uptake and residual soil nitrate accumulation compared with no-tillage and chisel plow



Agronomy Journal- 96(4): 1164-1171



Tillage and N management systems can have a significant effect on N use by corn (Zea mays L.) and nitrate (NO3-N) movement through the soil profile. Potential water quality and NO3-N loss problems associated with conventional tillage and fall-applied N have prompted this study. The objective is to evaluate strip tillage effect on corn N uptake and NO3-N movement through the soil profile compared with chisel plow and no-tillage systems. The three tillage systems implemented in this study were strip tillage, no-tillage, and chisel plow along with two N application timings (fall and spring) of 170 kg N ha(-1) for corn in a corn-soybean [Glycine max (L.) Merr.] rotation on two Iowa fields in 2001 and 2002. The three tillage systems were implemented every year for both crops (corn and soybean). Crop response, N uptake, and other soil NO3-N measurements were conducted on a randomized complete block design experiment. Grain yields and grain N uptake showed no significant improvement under strip tillage compared with no-tillage or chisel plow systems. Tillage and N treatments caused no significant differences in NO3-N accumulation at the lower depths of the root zone (1.2 m). Strip tillage and no-tillage resulted in lower residual soil NO3-N buildup than chisel plow in the 0- to 1.2-m soil profile after 2 yr of tillage implementation. Tillage and N treatments did not cause significant differences in NO3-N concentration in water leachate collected at the 1.2-m depth.

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Accession: 004127778

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DOI: 10.2134/agronj2004.1164


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