. 2017 Jan 5;5:e2860. doi: 10.7717/peerj.2860

Table 3. Soil analysis data from each location.

Location	pH^a	NH $_{4}^{+}$ (ppm)^b	NO $_{2}^{-}$ (ppm)^b	NO $_{3}^{-}$ (lb acre⁻¹)^b	P (lb acre⁻¹)^b	Ca²⁺ (ppm)^a	Humus (%)^a
A	7.9 ± 0.1	0	<1	<10	<10	3,500	9.1 ± 1.4
B	8.4 ± 0.1	<5	<1	15	25	17,500	11.8 ± 0.5
C	7.9 ± 0.0	<5	<1	15	75	17,500	11.5 ± 2.2
D	8.3 ± 0.1	<5	<1	15	75	17,500	11.7 ± 2.0
E	8.6 ± 0.0	<5	<1	≤10	75	25,000	3.9 ± 1.6
F	8.6 ± 0.1	<5	<1	<10	10	43,750	8.4 ± 2.8
G	8.9 ± 0.2	<5	<1	<10	<10	43,750	2.7 ± 1.2

Notes.

Average shows mean ± SE of three samples.

Average shows mode of three samples.