Publication Date
1993
Description
The effect of a companion legume (Arachis pintoi) on the growth and nitrogen nutrition of an associated grass (Di'gitaria decumbems) was studied during 2 regrowth periods. Digitaria growth was expressed as a function of the cumulative absorded PAR (photosynthetically active radiation) i.e., by using the radiation-use efficiency concept. For this purpose, PAR intercepted by both the pure and mixed swards was estimated by using a radiative transfer model. Nitrogen nutrition status of Digitaria was characterised by the relation between N uptake and dry matter production. Results show a close agreement between N nutrition level and radiation-use efficiency of the grass. As the result of the seasonal change of environmental N supply, radiation-use efficiency differences between the 2 growth periods were large. On tile other hnlld, radiation-use efficiency • and nitrogen nutrition did not show any significant difference between pure and mixed grasses.
Citation
Cruz, P; Sinoquet, H; and Sobesky, O, "Effect of a Legume (Arachis pintoi) on the Regrowth and Mineral Nutrition of Associated Pangola grass (Digitaria decumbens)" (2024). IGC Proceedings (1993-2023). 41.
https://uknowledge.uky.edu/igc/1993/session8/41
Effect of a Legume (Arachis pintoi) on the Regrowth and Mineral Nutrition of Associated Pangola grass (Digitaria decumbens)
The effect of a companion legume (Arachis pintoi) on the growth and nitrogen nutrition of an associated grass (Di'gitaria decumbems) was studied during 2 regrowth periods. Digitaria growth was expressed as a function of the cumulative absorded PAR (photosynthetically active radiation) i.e., by using the radiation-use efficiency concept. For this purpose, PAR intercepted by both the pure and mixed swards was estimated by using a radiative transfer model. Nitrogen nutrition status of Digitaria was characterised by the relation between N uptake and dry matter production. Results show a close agreement between N nutrition level and radiation-use efficiency of the grass. As the result of the seasonal change of environmental N supply, radiation-use efficiency differences between the 2 growth periods were large. On tile other hnlld, radiation-use efficiency • and nitrogen nutrition did not show any significant difference between pure and mixed grasses.
