Publication Date
1993
Description
Digitaria eriantha was grown from seed collected from low and high nutrient habitats. The plants were grown with either a high or low nutrient supply for 12 weeks. Rates of nitrogen and phosphorus absorption were measured on excised roots using colorimetric assays. The grasses from the low nutrient areas achieved the same maximum uptake rates regardless of the level of N supplied, This was not so for the grasses from the high nutrient site which increased their uptake rates with increased N supply. Plants from the low nutrient site showed markedly increased P absorption when supplied with high levels of P. These results support the idea that for mobile ions the supply of those ions to the root is the overall controlling factor on the rate of nutrient uptake. However, for the immobile ion the rate of nutrient absorption was the controlling factor.
Citation
Scholes, M C.; Scholes, R J.; and Retief, J, "Nitrogen and Phosphorus Nutrition of Digitaria eriantha: is it Limited by Absorption Capacity or Rate of Supply?" (2024). IGC Proceedings (1993-2023). 1.
https://uknowledge.uky.edu/igc/1993/session8/1
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Nitrogen and Phosphorus Nutrition of Digitaria eriantha: is it Limited by Absorption Capacity or Rate of Supply?
Digitaria eriantha was grown from seed collected from low and high nutrient habitats. The plants were grown with either a high or low nutrient supply for 12 weeks. Rates of nitrogen and phosphorus absorption were measured on excised roots using colorimetric assays. The grasses from the low nutrient areas achieved the same maximum uptake rates regardless of the level of N supplied, This was not so for the grasses from the high nutrient site which increased their uptake rates with increased N supply. Plants from the low nutrient site showed markedly increased P absorption when supplied with high levels of P. These results support the idea that for mobile ions the supply of those ions to the root is the overall controlling factor on the rate of nutrient uptake. However, for the immobile ion the rate of nutrient absorption was the controlling factor.
