. 2018 Jul 23;4(7):e00704. doi: 10.1016/j.heliyon.2018.e00704

Table 3.

Aboveground cowpea tissue mineral concentrations (mg kg⁻¹) of plants (two per pot) grown in soil amended with each of the experimental soil amendments.

Soil amendment	Ca	Fe	K	Mg	P	Zn
Control	13030^b	85.3^a	18714^ab	3211^c	1870^b	28.6^bc
WC	16973^a	93.6^a	21261^a	3881^bc	2438^ab	37.0^ab
B	16809^a	132^a	22313^a	4226^abc	2670^ab	39.3^ab
WC + B	18382^a	126^a	21823^a	3950^bc	2928^a	39.5^a
NP 100	19874^a	101^a	18714^b	5207^ab	1866^b	24.0^c
B + NP 150	19332^a	116^a	16814^ab	5615^a	2724^ab	28.0^bc
B + NP 100	20179^a	129^a	17449^ab	5703^a	2483^ab	26.5^bc
B + NP 50	17192^a	101^a	17360^ab	4701^ab	2912^a	30.4^abc
WC + B + NP 150	19262^a	117^a	20002^a	5411^a	2676^ab	28.6^bc
WC + B + NP 100	18340^a	108^a	19975^a	4943^ab	2894^a	34.7^ab
WC + B + NP 50	19559^a	117^a	21385^a	4652^ab	2864^a	35.9^ab

Soil Amendments: Control = Non-amended, WC = Worm Compost (120 g), B = Biochar (30 g), NP = Commercial Fertilizers (% of Recommended Rate). Data presented as LS means (n = 6). Within a column, values labeled with the same letter do not differ significantly (p < 0.05).