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| MEC and NP Model Projection Comparison. a NP model fits to MEC growth curves (Φ γ = 225 mol γ m −2 s −1 , c CO2 = 525 ppm) for dry bean, peanut, rice, soybean, sweet potato, tomato, wheat, white potato. b Sensitivity analysis result based on the ranges defined by the fitting procedure. The y − axis denotes the variable of interest wile the x − axis represents the corresponding variable's index value.
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Food production and pharmaceutical synthesis are posited as essential biotechnologies for facilitating human exploration beyond Earth. These technologies not only offer critical green space and food agency to astronauts but also promise to minimize mass and volume requirements through scalable, modular agriculture within closed-loop systems, offeri...
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... 62% for deficient, normal, and excess N levels, respectively. The particular hydroponic system used shows an average germination percentage of 85% for lettuce given normal N. The biomass data were compared to the output of the MEC model (Eq. (2)) with inputs of the average values of Φ γ and c CO2 observed in the hydroponic system (Fig. 4a); see Fig. S6a, b for the growth rate [g DW d −1 ] and relative growth rate 42 ...
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... more efficiently than plants in the other conditions at the expense of their average biomass at t M . The average nitrogen content across all conditions over time on a fresh weight basis was 0.36 ± 0.13%, similar to a reported value of 0.16% for iceberg lettuce measured by the same analytical method 43 . In terms of non-normalized mass of N (Fig. S6c), the plants in normal and excess conditions contained an increasing average mass of ...
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... by fitting the NP model to the predictions of the MEC model. Once the parameters were fitted, it was assumed that they followed a uniform distribution by perturbing them by ± 10% around their nominal values. This is a common approach when a prior distribution for parametric uncertainty is not well established 45 . From the results shown in Fig. 6, it is evident that the NP model was able to perfectly fit the MEC model predictions. Similar to the results from lettuce growth, the rate of N accumulation, r, still appears to play a significant role in the growth dynamics of most plants, being one of the most influential parameters in most crops. Collectively, other parameters that ...
