Table 3.
Mean effects of water salinity and biostimulant application on N content and N uptake in hemp tissues (cv. Felina 32).
| Water salinity | Total | Stem | Leaves | Inflor. | Total | Stem | Leaves | Inflor. | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| %N | kg N ha-1 | |||||||||||||||
| S0 | 1.64(± 0.10) | a | 0.50(± 0.05) | a | 2.56(± 0.13) | a | 3.36(± 0.16) | a | 210(± 20) | a | 32(± 3) | a | 100(± 9) | a | 78(± 11) | a |
| S1 | 1.50(± 0.05) | a | 0.45(± 0.02) | a | 2.41(± 0.05) | ab | 3.25(± 0.14) | a | 180(± 35) | a | 29(± 6) | ab | 90(± 9) | a | 60(± 13) | a |
| S2 | 1.44(± 0.09) | a | 0.47(± 0.04) | a | 2.28(± 0.11) | b | 3.03(± 0.07) | a | 130(± 12) | b | 23(± 3) | bc | 61(± 6) | b | 47(± 25) | b |
| S3 | 1.56(± 0.04) | a | 0.58(± 0.03) | a | 2.35(± 0.07) | b | 3.17(± 0.06) | a | 106(± 13) | b | 20(± 3) | c | 54(± 7) | b | 32(± 4) | c |
| Biostimulant | ||||||||||||||||
| NoB | 1.42(± 0.04) | B | 0.44(± 0.02) | B | 2.25(± 0.05) | B | 3.11(± 0.09) | A | 120(± 13) | B | 19(± 2) | B | 59(± 6) | B | 41(± 6) | B |
| B | 1.65(± 0.05) | A | 0.56(± 0.03) | A | 2.55(± 0.06) | A | 3.29(± 0.07) | A | 194(± 18) | A | 33(± 3) | A | 93(± 9) | A | 67(± 8) | A |
| Field control | 1.44(± 0.03) | 0.50(± 0.04) | 2.43(± 0.04) | 3.22(± 0.04) | 192(± 20) | 40(± 5) | 43(± 8) | 102(± 7) | ||||||||
| Factors (d.f.) | F-statistic | |||||||||||||||
| WS (3) | 2.86 | 3.15 | 3.67 | 1.42 | 11.86 | 4.50 | 8.19 | 7.44 | ||||||||
| BIO (1) | 18.61 | 14.75 | 23.38 | 2.37 | 29.36 | 28.71 | 18.97 | 13.16 | ||||||||
| WS x BIO (3) | 2.06 | 0.82 | 1.85 | 0.57 | 2.45 | 1.36 | 1.97 | 1.10 | ||||||||
| Factors | p-value | |||||||||||||||
| WS | 0.070 | 0.054 | 0.035 | 0.275 | 0.000 | 0.018 | 0.002 | 0.002 | ||||||||
| BIO | 0.001 | 0.001 | 0.000 | 0.143 | 0.000 | 0.000 | 0.000 | 0.002 | ||||||||
| WS x BIO | 0.146 | 0.503 | 0.178 | 0.645 | 0.102 | 0.290 | 0.159 | 0.377 | ||||||||
Water salinity treatments: S0 freshwater control; S1, S2, and S3 are saline solutions prepared by adding 15.7, 35.2, and 54.8 mmol L-1 of NaCl to tap water, corresponding to electrical conductivities of 2, 4, and 6 dS m-1, respectively. Biostimulant treatments: NoB is non-treated control; B amendment with legume protein hydrolysate. Field control corresponds to hemp grown in large plots under optimal conditions. Means with the same letter (lowercase for water salinity and uppercase for the application of biostimulants) are not different according to the LSD test (P ≤ 0.05). Standard errors (n=6 for water salinity and n=12 for biostimulant) are reported in brackets.
The F-statistic represents the ratio of variance explained by tested factors and their interaction to variance within groups. The p-value indicates the likelihood of the results being due to chance.