Effects of tillage intensity on nitrogen dynamics and productivity in legume-based grain systems

L. E. Drinkwater, R. R. Janke, L. Rossoni-Longnecker

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

In 1988 an experiment was established at the Rodale Institute Experimental Farm to study weed control and nitrogen (N) management in rotations with grain crops and N-fixing green manures under reduced tillage, without the use of herbicides. Tillage intensities ranging from moldboard plow (MP) to continuous no-till (NT) were compared. We present results for maize production in 1994, the seventh year of the experiment. Our goal was to further investigate reduced tillage regimes that alternated no-till with different forms of primary tillage in legume-based systems. In the chisel-disc (CD) and MP treatments comparable yields were achieved under so-called organic (weeds controlled with cultivation and green manure N source) and conventional management (weeds controlled with herbicides and mineral N fertilizer applied). Weed competition in these treatments was minimal and the N status of maize plants was essentially the same regardless of the N source (fertilizer or green manure). Of the four organic no-till maize treatments, only the mixed-tillage system with cultivation for weed control (CD-NTc) produced yields comparable to conventional NT maize. The fate of vetch N as well as temporal N dynamics were largely determined by tillage intensity and the handling of the vetch residues at maize planting. Treatments with primary tillage (CD and MP) had extremely high levels of mineral N early in the season and had greater average net N-mineralization, even though N content of hairy vetch in these treatments was equal to or lower than that in treatments with mow-killed vetch. In terms of soil mineral N concentrations, the CD-NTc treatment was similar to the other mow-killed vetch/no-till maize treatments. However, N availability in this treatment was greater, probably due to more complete decomposition of green manure residues. Cultivation for weeds not only helped control weeds but also increased mineralization of the vetch residues, which in turn increased the N supply during the period of maximum N demand by the maize. Carefully designed rotations combining tillage reductions with the use of leguminous N sources can have multiple benefits, including improved timing of N availability, reduced herbicide applications, and improved soil quality in the long term.

Original languageEnglish
Pages (from-to)99-113
Number of pages15
JournalPlant and Soil
Volume227
Issue number1-2
DOIs
Publication statusPublished - 2000

Fingerprint

tillage
Vicia
legumes
maize
no-tillage
productivity
green manures
corn
nitrogen
moldboard plows
weed control
weed
reduced tillage
herbicide
mineralization
herbicides
weeds
mineral
fertilizer
Vicia villosa

Keywords

  • Green manure
  • Mixed-tillage rotations
  • Nitrogen mineralization
  • No-till
  • Organic agriculture
  • Vetch

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Cite this

Effects of tillage intensity on nitrogen dynamics and productivity in legume-based grain systems. / Drinkwater, L. E.; Janke, R. R.; Rossoni-Longnecker, L.

In: Plant and Soil, Vol. 227, No. 1-2, 2000, p. 99-113.

Research output: Contribution to journalArticle

Drinkwater, L. E. ; Janke, R. R. ; Rossoni-Longnecker, L. / Effects of tillage intensity on nitrogen dynamics and productivity in legume-based grain systems. In: Plant and Soil. 2000 ; Vol. 227, No. 1-2. pp. 99-113.
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