International Scholarly Research Notices

Research Article

Irrigation Water Chemistry: Impact on Microbial Community Composition and Biogeochemical Leaching under Perennial Ryegrass (Lolium perenne [L])

Table 1

Input and output irrigation water chemistry. All values are mg·L⁻¹. Electrical conductivity is μS cm⁻¹. Values in parenthesis are standard deviation ( for input equivalent to 20 irrigation events and for 6 replicates per treatment inclusive of fertilized and unfertilized microcosms for outputs). HRW: harvested rain water; MTW: municipal tap water; GWB: bath greywater and GWW: washing machine greywater. Subscript I is input chemistry and Subscript O in output chemistry. Analyses of base cations in leachate was not performed.


Constituent	HRW_I	HRW_O	MTW_I	MTW_O	GWB_I	GWB_O	GWW_I	GWW_O

pH	7.92 (0.36)	7.90 (0.06)	8.44 (0.10)	8.67 (0.02)	8.81 (0.45)	8.68 (0.06)	8.64 (0.46)	8.59 (0.06)
Conductivity	63.3 (7.7)	413 (17)	648 (35)	1011 (51)	732 (181)	1463 (133)	654 (98)	1362 (80)
Na⁺	18.7 (11.6)	—	205.9 (24.8)	—	194.9 (35.2)	—	189.4 (30.9)	—
K⁺	1.0 (0.8)	—	3.0 (2.6)	—	6.3 (5.0)	—	4.3 (1.0)	—
Mg²⁺	0.4 (0.1)	—	0.4 (0.1)	—	0.5 (0.3)	—	0.4 (0.1)	—
Ca²⁺	6.0 (1.7)	—	3.0 (0.6)	—	2.3 (1.1)	—	1.9 (0.6)	—
NH₄–N	0.07 (0.09)	0.14 (0.02)	0.03 (0.02)	0.16 (0.03)	5.6 (10.5)	0.41 (0.05)	1.6 (1.2)	0.18 (0.02)
PO₄–P	0.03 (0.02)	0.30 (0.07)	0.2 (0.1)	1.26 (0.12)	0.5 (1.0)	2.02 (0.34)	0.1 (0.2)	1.15 (0.09)
NO₃–N	0.8 (0.4)	2.8 (0.8)	0.2 (0.1)	4.4 (0.8)	0.2 (0.1)	17.3 (3.3)	0.1 (0.1)	6.9 (0.5)
HCO₃⁻	25.0 (7.4)	107.6 (8.7)	345.6 (31.5)	350.2 (8.0)	375.7 (93.4)	509.0 (19.2)	359.4 (97.5)	465.9 (23.6)
DOC	7.0 (4.0)	30.7 (4.0)	1.0 (0.4)	62.4 (10.0)	14.1 (19.4)	108.5 (20.8)	45.5 (16.9)	98.3 (6.0)