Productivity and Nutritive Quality of Johnsongrass (Sorghum halepense) as Influenced by Commercial Fertilizer, Broiler Litter, and Interseeded White Clover (Trifolium repens)

Table 2

Yield of dry matter (DM) and foliar concentrations (DM basis) of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and select minerals from Johnsongrass interseeded with (+C) or without (−C) white clover and amended with commercial fertilizer (CF), noncompacted broiler litter (BL-N), or compacted broiler litter (BL-C).

	Fertilizer treatment
	CF	BL-N	BL-C	Mean
DM Yield (kg/ha)
−C	7.590	6.656	7.314	7.187
+C	6.555	6.810	6.208	6.524
Mean	7.073	6.733	6.761
CP (%)
−C	10.2	10.0	9.7	9.9^a
+C	10.6	10.5	10.4	10.5^b
Mean	10.4	10.3	10.0
NDF (%)
−C	63.2	63.8	65.4	64.1
+C	64.2	66.8	67.2	66.0
Mean	63.7	65.3	66.3
ADF (%)^c
−C	36.3	34.8	35.2	35.4
+C	34.8	35.6	35.8	35.4
Mean	35.5	35.2	35.5
ADL (%)^d
−C	3.4	3.0	3.2	3.2
+C	3.1	3.2	3.2	3.2
Mean	3.2	3.1	3.2
P (mg/kg)
−C	0.17	0.18	0.18	0.18
+C	0.17	0.17	0.18	0.17
Mean	0.17	0.18	0.18
K (mg/kg)
−C	0.85	0.99	0.93	0.92
+C	1.01	1.09	1.09	1.06
Mean	0.93	1.04	1.01
Zn (mg/kg)
−C	37.6	40.9	40.2	39.5
+C	37.2	40.7	40.1	39.3
Mean	7.4^e	40.8^f	40.1^f
Cu (mg/kg)
−C	4.5	5.4	4.9	5.0
+C	5.1	5.9	5.7	5.6
Mean	4.8	5.6	5.3

^a,bClover treatment means without a common superscript differ (𝑃<0.10); SE = 1.43, 𝑛=48.
^cClover treatment × fertilizer treatment interaction (𝑃<0.10); SE = 0.89, 𝑛=16.
^dClover treatment × fertilizer treatment interaction (𝑃<0.05); SE = 0.58, 𝑛=16.
^e,fFertilizer treatment means without a common superscript differ (𝑃<0.10); SE = 2.05, 𝑛=32.