Potato Research

, Volume 33, Issue 2, pp 257–267 | Cite as

Relationships between numbers of main stems and yield components of potato (Solanum tuberosum L. cv. Erntestolz) as influenced by different daylengths

  • Berga Lemaga
  • K. Caesar


The relationshops between numbers of main stems and some measures of growth and yield, as well as total tuber yield, were examined for potatoes grown under different daylengths. Leaf area, tuber number and tuber yield per plant increased significantly with increasing daylength and number of main stems. Numbers of main stems and leaf area were correlated positively with tuber number and tuber yield and negatively with average tuber weight. The correlations were stronger with stem number than with leaf area and were differently affected by daylength. Standard regression coefficients indicated that stem number has strong positive and negative relationships with tuber number and average tuber weight, respectively. Since tuber number was a better determinant of yeild than average tuber weight, the final relationship between the numbers of main stems and tuber yield remained positive for all daylengths. Determinants that will best explain variation in tuber total yield, tuber number, and average tuber weight are suggested.

Additional key words

leaf area tuber number average tuber weight predictor variable 


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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Berga Lemaga
    • 1
  • K. Caesar
    • 1
  1. 1.Institute of Crop ScienceTechnical University of BerlinBerlin 33Bundesrepublik Deutschland

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