Root respiration and bacterial population of roots, 1. Effect of nitrogen source, potassium nutrition and aeration of roots [wheat, Triticum]
1981
Troldenier, G. | Rheinbaden, W. von (Kali und Salz A.G., Hannover (Germany, F.R.). Landwirtschaftliche Forschungsanstalt Buentehof)
The investigations presented have been carried out to study the interactions between different sources of nitrogen, potassium nutrition and aeration of spring wheat roots related to root respiration, dry matter production, mineral contents of the plants and number of bacteria on the roots. Root respiration included oxygen consumption of the excised roots and their microbial colonizers. It was low towards the end of the dark period and increased within two hours during the light period. Independent of the nutrient supply the respiration rate and bacterial number are considerably higher in unaerated than in aerated nutrients solution. Root respiration was lowest with nitrate and highest with ammonium nutrition. Respiration corresponded to the bacterial colonization of the roots. The discontinuation of potassium supply led in plants supplied with nitrate to an insignificant increase in root respiration, whereas a marked increase in respiration was observed in plants with mixed ammonium and nitrate nutrition. Root respiration of plants supplied with ammonium declined when potassium was discontinued. Discontinuation of potassium supply caused an increase in root respiration and bacterial numbers in both aerated and unaerated media.
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