Source of the soybean N credit in maize production

L. E. Gentry, Frederick E Below, Mark B David, J. A. Bergerou

Research output: Contribution to journalArticle

Abstract

Nitrogen response trials throughout the United States Corn Belt show that economic optimum rates of N fertilization are usually less for maize (Zea mays L.) following soybean (Glycine max L.) than for maize following maize; however, the cause of this rotation effect is not fully understood. The objective of this study was to investigate the source of the apparent N contribution from soybean to maize (soybean N credit) by comparing soil N mineralization rates in field plots of unfertilized maize that had either nodulated soybean, non-nodulated soybean, or maize as the previous crop. Crop yields, plant N accumulation, soil inorganic N, and net soil mineralization were measured. Both grain yield (6.3 vs. 2.8 Mg ha-1) and above-ground N accumulation (97 vs. 71 kg ha-1) were greatly increased when maize followed nodulated soybean compared with maize following maize. A partial benefit to yield and N accumulation was also observed for maize following non-nodulated soybean. Cumulative net soil N mineralization following nodulated soybean, non-nodulated soybean, and maize was 112, 92 and 79 kg N ha-1, respectively. Net mineralization of soil N appeared to be influenced by both quality (C:N ratio) and quantity of residue from the previous crop. In addition to an increase in plant available N from mineralization, the amount of soil inorganic N (especially in soil 5 cm from the row) was greater following nodulated soybean than non-nodulated soybean or maize. Based on these data, the soybean N credit appears to result from a combination of a decrease in net soil mineralization in continuous maize production and an increase in residual soil N from symbiotic fixation.

Original languageEnglish (US)
Pages (from-to)175-184
Number of pages10
JournalPlant and Soil
Volume236
Issue number2
DOIs
StatePublished - Dec 1 2001

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credit
soybean
maize
soybeans
corn
mineralization
soil
Corn Belt region
crop
residual soil
crops
carbon nitrogen ratio
crop yield
Glycine max
fixation
Zea mays
grain yield

Keywords

  • Corn
  • Crop rotation
  • Maize
  • Mineralization
  • Residual nitrogen
  • Soybean nitrogen credit

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Cite this

Source of the soybean N credit in maize production. / Gentry, L. E.; Below, Frederick E; David, Mark B; Bergerou, J. A.

In: Plant and Soil, Vol. 236, No. 2, 01.12.2001, p. 175-184.

Research output: Contribution to journalArticle

Gentry, LE, Below, FE, David, MB & Bergerou, JA 2001, 'Source of the soybean N credit in maize production', Plant and Soil, vol. 236, no. 2, pp. 175-184. https://doi.org/10.1023/A:1012707617126
Gentry, L. E. ; Below, Frederick E ; David, Mark B ; Bergerou, J. A. / Source of the soybean N credit in maize production. In: Plant and Soil. 2001 ; Vol. 236, No. 2. pp. 175-184.
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