Journal
PLANTS-BASEL
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/plants10081741
Keywords
amino acids; biomass production; cultivation; Lemnaceae; nutrient medium; uptake; water lentils; yield
Categories
Funding
- Deutsche Bundesstiftung Umwelt (DBU) [34223/01-46]
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By testing different nitrate-N to ammonium-N ratios and dilutions, it was found that a ratio of 75% nitrate-N and 25% ammonium-N, with a dilution of 50%, yielded the best results for Lemna minor and Wolffiella hyalina. This ratio and dilution resulted in the highest relative protein yield per week and m(2) for both species.
In order to produce protein-rich duckweed for human and animal consumption, a stable cultivation process, including an optimal nutrient supply for each species, must be implemented. Modified nutrient media, based on the N-medium for duckweed cultivation, were tested on the relative growth rate (RGR) and crude protein content (CPC) of Lemna minor and Wolffiella hyalina, as well as the decrease of nitrate-N and ammonium-N in the media. Five different nitrate-N to ammonium-N molar ratios were diluted to 10% and 50% of the original N-medium concentration. The media mainly consisted of agricultural fertilizers. A ratio of 75% nitrate-N and 25% ammonium-N, with a dilution of 50%, yielded the best results for both species. Based on the dry weight (DW), L. minor achieved a RGR of 0.23 +/- 0.009 d(-1) and a CPC of 37.8 +/- 0.42%, while W. hyalina's maximum RGR was 0.22 +/- 0.017 d(-1), with a CPC of 43.9 +/- 0.34%. The relative protein yield per week and m(2) was highest at this ratio and dilution, as well as the ammonium-N decrease in the corresponding medium. These results could be implemented in duckweed research and applications if a high protein content or protein yield is the aim.
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