Compost and Crude Humic Substances Produced from Selected Wastes and Their Effects on Zea mays L. Nutrient Uptake and Growth

Table 9

Selected soil chemical properties at 48 DAS.

Property	T0	T1	T2	T3	T4	T5	T6	T7	T8	T9
pHwater	4.81^c (±0.06)	4.51^d (±0.03)	5.01^b (±0.03)	5.20^a (±0.04)	5.05^ab (±0.02)	4.80^c (±0.02)	4.69^c (±0.03)	5.01^b (±0.02)	5.06^ab (±0.02)	5.13^ab (±0.03)
OM (%)	4.00^d (±0.14)	4.25^cd (±0.17)	4.35^cd (±0.17)	4.75^bcd (±0.15)	5.00^bc (±0.22)	4.55^bcd (±0.10)	4.55^bcd (±0.25)	5.40^b (±0.23)	7.95^a (±0.32)	4.65^bcd (±0.15)
Total carbon (%)	2.32^d (±0.08)	2.47^cd (±0.10)	2.52^cd (±0.10)	2.76^bcd (±0.09)	2.90^bc (±0.13)	2.64^bcd (±0.06)	2.64^bcd (±0.15)	3.13^b (±0.13)	4.61^a (±0.19)	2.70^bcd (±0.09)
Total N (%)	0.11^c (±0.01)	0.12^bc (±0.01)	0.13^abc (±0.01)	0.12^bc (±0.01)	0.13^abc (±0.01)	0.11^c (±0.00)	0.13^abc (±0.01)	0.15^ab (±0.01)	0.16^a (±0.01)	0.13^abc (±0.01)
Exchangeable NH4^+ (mg kg^−1)	40.28^b (±5.98)	99.83^a (±12.59)	22.77^b (±5.26)	22.77^b (±6.63)	35.03^b (±2.86)	21.02^b (±2.86)	19.27^b (±3.35)	17.52^b (±2.02)	33.28^b (±3.35)	21.02^b (±2.86)
Available NO3^− (mg kg^−1)	22.77^bc (±1.75)	21.02^bc (±2.86)	26.27^bc (±5.98)	19.27^bc (±1.75)	24.52^bc (±2.02)	29.77^bc (±5.98)	17.52^c (±2.02)	15.76^c (±1.75)	47.29^a (±3.35)	35.03^ab (±2.86)
Available P (mg kg^−1)	1.68^d (±0.23)	49.74^a (±3.83)	30.36^cb (±2.92)	48.58^a (±4.43)	47.84^ab (±3.77)	50.96^a (±5.59)	28.91^c (±3.68)	30.74^bc (±1.89)	37.82^abc (±2.30)	39.26^abc (±4.29)
Exchangeable K (cmol kg^−1)	0.09^d (±0.00)	0.29^bc (±0.03)	0.28^bc (±0.05)	0.63^a (±0.03)	0.27^bc (±0.01)	0.30^bc (±0.03)	0.29^bc (±0.01)	0.38^b (±0.00)	0.25^c (±0.02)	0.34^bc (±0.01)
CEC (cmol kg^−1)	10.93^bc (±0.43)	9.80^c (±0.28)	12.05^ab (±0.31)	11.50^abc (±0.34)	11.58^abc (±0.46)	11.83^abc (±0.38)	12.53^ab (±1.07)	13.30^a (±0.26)	13.73^a (±0.19)	11.70^abc (±0.32)

Different letters within a row indicate significant difference between means using Tukey’s test at 𝑃≤0.05.
( ) values in parenthesis represent standard error of the mean.