State-space approach to spatial variability of crop yield

O. Wendroth, A. M. Al-Omran, C. Kirda, K. Reichardt, D. R. Nielsen

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Determined, using a state-space approach, the underlying process in a soil that caused spatial yield variability of a N2-fixing crop and a nonfixing crop. Ryegrass Lolium multiflorum and alfalfa Medicago sativa were cropped on neighboring transects. Dinitrogen fixation, calculated with either the difference method or the 15N isotope dilution method and averaged across the transects, did not differ, but as the authors examined locations along the transect, differences in amount of fixed N calculated by each method became apparent. Yields of both crops showed different variability structures along the transects. Local effective soil N content was related to local N uptake from soil and to soil symbiotic N2 fixation of alfalfa. The spatial distribution of the soil volume taken by stones in this partially rocky soil had to be considered. -from Authors

Original languageEnglish
Pages (from-to)801-807
Number of pages7
JournalSoil Science Society of America Journal
Issue number3
StatePublished - 1992

ASJC Scopus subject areas

  • Soil Science


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