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Soil Nitrogen and Carbon Response to Maize Cropping System, Nitrogen Source, and Tillage

PAN North America Regional Center, 116 New Montgomery, #810, San Francisco, CA 94105

Rattan Lal and Terry Logan

School of Natural Resources, Ohio State Univ., Columbus, OH

Juan Sigarán

Centro de Investigaciones Agronómicas, Universidad de Costa Rica, Apdo 34-2060, San José, Costa Rica

*Corresponding author (mreeves{at}panna.org).

ABSTRACT

These experiments were conducted to evaluate the combined effects of intercropping and N source and the interaction of these two factors with tillage on N dynamics. Maize (Zea mays L.) was planted in two consecutive years in Costa Rica to measure changes in soil mineral N, soil C, and maize grain N in response to monoculture or polyculture and legume residues or NH₄NO₃ fertilizer under conventional (CT) or minimum (MT) tillage. Soil mineral N levels were greater with fertilizer than with residues at the end of the first season and greater with residues at the beginning of the second season, reflecting a residual effect from the previous season. There were no treatment interactions. The dominant form of mineral N shifted from NO^–₃-N (first season) to NH⁺₄-N (second season). The shift corresponded to an overall increase in soil C (from 27.6 to 30.2 g kg^–1), which was significantly greater under monoculture and with residues (33.2 and 33.4 g kg^–1, respectively) than under polyculture and fertilizer (31.1 and 30.9 g kg^–1, respectively). A positive cropping system x N source interaction resulted in 67% greater maize grain N in the polyculture under residues than with fertilizer N. Maize response to polyculture and legume residues, together with soil N and C data, were used to propose a mechanistic explanation for how these strategies may help maintain productivity (and minimize N loss) in low-input farming systems.

Received for publication May 17, 1995.

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