Publication Date
1993
Description
Seven white clover (Trifolium repens L) cultivars were grown in growth rooms at S different temperatures between S and 2S°C. Plant growth and nitrogenase activity (acetylene reduction) were measured. There were significant effects of temperature on total plant ay matter (DM) accumulation and nitrogenase activity. Temperature x cultivar interactions were significant for DM accumulation, nitrogenase activity per pot and nitrogenase activity/g DM. There was a strong correlation between DM increment/°C rise in temperature over the range 10-20°C, and nitrogenase activity/g DM. Three cultivars had maximum nitrogenase activity/g plant DM at 200C and 4 cultivars peaked at 15° C. These differences between cultivars may be related to the rate of change in DM accumulation and hence demand for nitrogen interacting with the supply of mineral nitrogen from the soil. Cultivars with mediterranean parentage exhibiting cool season growth had peak nitrogenase activity per g DM at a lower temperature than cultivars from colder climates.
Citation
Crush, J R.; Campbell, B D.; and Caradus, J R., "Effect of Temperature on Nitrogen Fixation Rates in Seven Clover Cultivars" (2024). IGC Proceedings (1993-2023). 38.
https://uknowledge.uky.edu/igc/1993/session8/38
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Effect of Temperature on Nitrogen Fixation Rates in Seven Clover Cultivars
Seven white clover (Trifolium repens L) cultivars were grown in growth rooms at S different temperatures between S and 2S°C. Plant growth and nitrogenase activity (acetylene reduction) were measured. There were significant effects of temperature on total plant ay matter (DM) accumulation and nitrogenase activity. Temperature x cultivar interactions were significant for DM accumulation, nitrogenase activity per pot and nitrogenase activity/g DM. There was a strong correlation between DM increment/°C rise in temperature over the range 10-20°C, and nitrogenase activity/g DM. Three cultivars had maximum nitrogenase activity/g plant DM at 200C and 4 cultivars peaked at 15° C. These differences between cultivars may be related to the rate of change in DM accumulation and hence demand for nitrogen interacting with the supply of mineral nitrogen from the soil. Cultivars with mediterranean parentage exhibiting cool season growth had peak nitrogenase activity per g DM at a lower temperature than cultivars from colder climates.
