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Annals of Botany 80: 641-648, 1997
© 1997 Annals of Botany Company

Contribution from Stolons and Roots to Estimates of the Total Amount of N2Fixed by White Clover (Trifolium repensL.)

FINN VANMAN JØRGENSEN and STEWART F. LEDGARD

Plant Ecosystems and Nutrient Cycling, Plant Biology and Biogeochemistry Department, Risø National Laboratory, DK-4000, Roskilde, Denmark AgResearch, Ruakura Agricultural Research Centre, Private Bag 3123, Hamilton, New Zealand

February 3, 1997 ; July 16, 1997 .

Growth and N-accumulation rates in leaves, stolons and roots of individual white clover plants were studied in three experiments using two methods. In a growth chamber experiment, the relative differences between tissues were found to be almost constant for a wide range of clover plant sizes. The stolon dry matter (DM) production was 56% and the root DM production 40% of the DM production in leaves. The N yield of stolons was 30% while N yield in roots was 34% of N yield in leaves. The effect of N application on these relations was investigated in a glasshouse experiment. Application of N reduced the root:shoot N ratio from 0.50 to 0.28, whereas the stolon+root:leaf N ratio (i.e. for abovevs.below cutting-height tissues) was only reduced from 0.97 to 0.80. In a field trial with two contrasting N regimes, growth and N accumulation were measured on individual clover plants. Dinitrogen fixation was estimated by15N isotope dilution based on analysis of leaves-only or by including stolons. Using leaves-only did not affect the calculation of percentage of clover N derived from N2fixation (% Ndfa) since the15N enrichment was found to be uniform in all parts of the clover. A correction factor of 1.7 to account for N in below cutting-height tissue is suggested when N2fixation in white clover is estimated by harvesting the leaves only.Copyright 1997 Annals of Botany Company

Leaves; N accumulation; N2fixation; 15N isotope dilution; pastures; roots; root/shoot ratio; stolons; Trifolium repensL.; white clover


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