Supplementary Information: Table 1b: Applied nutrient solutions (NS) for the control treatment and the Mg, P, N-free nutrient solution for treatments inoculated treatments additionally fertilized with struvite. Nutrients applied Control NS Mg, P, N-free NS KPO4H2 136 mg/L --- KNO3 101 mg/L --- K2SO4 217 mg/L 435 mg/L Ca(NO3)2 164 mg/ --- CaCl2 111 mg/L 111 mg/L Mg(NO3)2 148.3 mg/L --- Hortilon 0.1 mg/L 0.1 mg/L Sequestrene 0.1 mg/L 0.1 mg/L Table 2b: Climatic conditions inside the RTG Lab. TEMPERATURE AVERAGE T ºC 18.94 MINIMUM T ºC 4.48 MAXIMUM T ºC 29.89 STANDARD DEVIATION 2.09 REALATIVE HUMIDITY AVERAGE (RH) 38.11 MINIMUM (RH) 5.65 MAXIMUM (RH) 77.37 STANDARD DEVIATION 5.83 Table 3b: Leachate NO3- content (mg/L) from results given for three treatments A) 2g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution B) 5g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution and C) standard nutrient solution - Rhizobium inoculation at five time periods from the 14 DAT until 77 DAT. DATE A B C 14 DAT 7,71 10,57 8,54 35 DAT 3,41 4,89 32,89 49 DAT 0,92 0,91 47,87 63 DAT 0,03 0,36 51,97 77 DAT 0,32 N.A. 55,93 Supplementary figure Legends: Figure 1b: Image of the Experimental layout in the RTG Lab. Figure 2b: Chlorophyll content measurements ( SPAD) in Phaseolus vulgaris leaves. Results given for three treatments A) 2g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution B) 5g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution and C) standard nutrient solution - Rhizobium inoculation measured at 9 time periods throughout the crop cycle. Figure 3b: Nutrient concentration in Phaseolus vulgaris leaves and shoots, expressed in mg/g. Results given for three treatments A) 2g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution B) 5g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution and C) standard nutrient solution - Rhizobium inoculation at three different time periods. 35 days after transplanting, 62 days after transplanting and 84 days after transplanting. Figure 4b: Nutrient content in Phaseolus vulgaris leaves and shoots, expressed in g. Results given for three treatments A) 2g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution B) 5g of struvite + Rhizobium inoculation + P, Mg, N-free nutrient solution and C) standard nutrient solution - Rhizobium inoculation at three different time periods. 35 days after transplanting, 62 days after transplanting and 84 days after transplanting Date Treatment % Ndfa plant-1 Total N in plant Kg/ha Biologically Kg/ha N from kg/ha fixed N Struvite 35 DAT A 68% 7.54±1.03a 5.38±1.04 b 2.16 B 60% 8.59±2.19 a 5.33±1.38 b 3.26 C 62 DAT A 89% 24.67±4.96 a 22.92±4.07 b 1.75 B 73% 24.62±6.20 a 18.70±5.09 b 5.92 C 84 DAT A 90% 27.25±12.79 a 25.40±12.96 b 1.85 B 82% 35.04±9.16 a 29.21±7.79 b 5.83 C