Comparison of Raw Dairy Manure Slurry and Anaerobically Digested Slurry as N Sources for Grass Forage Production

Table 8

Soil NO−3–N (mg kg⁻¹) at 0 to 30 cm depth, 2009–2011.

	Soil NO^−3–N (mg kg^−1)
	Treatment
Sample Date	Control	Urea	Raw subsurface	Raw broadcast	Digested subsurface	Digested broadcast
			2009
12-May	20gh	21gh	18gh	19gh	19gh	20gh
4-Jun	18gh	28fg	24fg	23 g	30fg	24fg
6-Jul	35fe	80b	71bc	76bc	68c	65cd
3-Aug	34f	86ab	80b	76bc	86ab	71bc
9-Sep	20gh	91a	66cd	82ab	72bc	67c
21-Sep	20gh	81b	53de	62cd	78bc	55d
1-Oct	17gh	62cd	52de	50de	56d	45de
19-Oct	14gh	91a	35fe	54de	44e	45de
3-Nov	11h	54de	23g	30fg	29fg	23g
19-Nov	10h	22gh	9.8h	12h	11h	10h
30-Nov	11h	11gh	12h	12h	10h	12h
			2010
26-Feb	12fg	11fg	15ef	15ef	13f	14ef
11-May	13f	23d	20de	20de	20de	18ef
16-Jun	6.1g	9.2fg	7.9g	7.0g	7.4g	7.3g
13-Jul	10fg	25cd	18e	18de	16ef	14ef
17-Aug	13fg	61a	23cd	22de	18ef	22de
30-Sep	18de	36b	23cd	28c	22de	19de
12-Oct	12fg	28bc	22de	22de	27cd	24cd
26-Oct	7.2g	12fg	15ef	17ef	21de	16ef
2-Dec	6.9g	8.2g	11fg	9.5fg	10fg	10fg
			2011
4-Apr	6.1g	6.2g	7.0g	6.5g	7.0g	8.0g
21-Jun	7.9g	18ef	11fg	11fg	12fe	12fg
4-Aug	8.7g	21ef	15fg	17ef	18ef	18ef
30-Aug	12fg	43cd	22ef	16f	23ef	17ef
16-Sept	17ef	48bc	39cd	48bc	48bc	32d
29-Sept	17ef	46c	36d	42cd	55b	36d
13-Oct	19ef	66a	45c	44c	50bc	44c
4-Nov	8.4g	32d	28de	24e	30de	23ef

Letters within a year indicate significant differences at 𝜌=0.05.