Assessment for forage grass quality submitted to compaction degrees and nitrogen doses

Ivana Pires de Sousa-Baracho; Marcela Carlota Nery; Wellington Willian Rocha; Múcio Mágno de Melo Farzeni; Filipe Rodrigues Valeriano; Bárbara Maria da Cruz Bento; Adriana de Souza Rocha; Rita de Cássia Ribeiro Carvalho; Ivana Pires de Sousa-Baracho; Marcela Carlota Nery; Wellington Willian Rocha; Múcio Mágno de Melo Farzeni; Filipe Rodrigues Valeriano; Bárbara Maria da Cruz Bento; Adriana de Souza Rocha; Rita de Cássia Ribeiro Carvalho

doi:10.48130/grares-0024-0004

Pr > Fc
VF	DF	GM (%)	DM (%)	H (cm)	RV (cm³)	CP (% DM)	NDF (% DM)	ADF (% DM)	LIG (% DM)
Megathyrsus maximum cv. Mombaça
Block	3	0,03*	0,054^ns	0,48^ns	0,89^ns	0,00*	0,29^ns	0,37^ns	0,23^ns
ND	3	0,00*	0,00*	0,00*	0,00*	0,00*	0,00*	0,00*	0,18^ns
DC	3	0,64^ns	0,38^ns	0,74^ns	0,11^ns	0,66^ns	0,60^ns	0,58^ns	0,90^ns
ND × DC	9	0,45^ns	0,59^ns	0,82^ns	0,46^ns	0,33^ns	0,91^ns	0,59^ns	0,25^ns
Waste	45
Urochloa brizantha cv. MG-5 Vitória
Block	3	0,32^ns	0,70^ns	0,07^ns	0,81^ns	0,00*	0,84^ns	0,80^ns	0,45^ns
ND	3	0,00*	0,00*	0,00*	0,00*	0,00*	0,00*	0,00*	0,23^ns
DC	3	0,49^ns	0,26^ns	0,72^ns	0,56^ns	0,31^ns	0,69^ns	0,78^ns	0,97^ns
ND × DC	9	0,46^ns	0,26^ns	0,76^ns	0,63^ns	0,77^ns	0,31^ns	0,45^ns	0,38^ns
Waste	45
Urochloa ruziziensis
Block	3	0,56^ns	0,36^ns	0,83^ns	0,64^ns	0,02*	0,64^ns	0,85^ns	0,82^ns
ND	3	0,00*	0,00*	0,23^ns	0,00*	0,00*	0,00*	0,00*	0,88^ns
DC	3	0,76^ns	0,22^ns	0,71^ns	0,10^ns	0,52^ns	0,63^ns	0,35^ns	0,33^ns
ND × DC	9	0,34^ns	0,18^ns	0,95^ns	0,04*	0,63^ns	0,66^ns	0,55^ns	0,55^ns
Waste	45
* Significant and ns (not significant) at 5% probability. ND = Nitrogen Dose; DC = Degree of Compaction; VF = Variation Fator; DF = Degree of Freedom.

Table 1.

Analyses of variance for the average contents of GM and DM production of the aerial part, H, RV, CP, NDF, ADF and LIG for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis. UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	7.51b	26.84a	27.19a	28.83a
Urochloa brizantha cv. MG-5 Vitória	10.79b	35.79a	38.09a	38.46a
Urochloa ruzizienses	10.53c	32.21b	33.80b	41.71a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 2.

Average values of green mass (GM) in g·plant⁻¹ for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	1.79b	5.53a	5.45a	5.65a
Urochloa brizantha cv. MG-5 Vitória	2.59b	7.83a	8.26a	8.51a
Urochloa ruzizienses	2.09c	6.53b	6.69b	8.35a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 3.

Average dry mass (DM) values in g·plant⁻¹ for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	66.76b	91.53a	89.74a	94.71a
Urochloa brizantha cv. MG-5 Vitória	76.16b	103.68a	91.36a	101.17a
Urochloa ruzizienses	62.81a	72.63a	70.71a	74.06a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 4.

Average plant height values (H) in cm for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	7.44b	13.63a	14.13a	11.56a
Urochloa brizantha cv. MG-5 Vitória	9.31b	16.56a	17.25a	17.75a
Urochloa ruzizienses	6.69b	16.50a	14.13a	15.50a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 5.

Average values of root volume (RV) in cm³ for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

DC (%)	Doses of N (kg·ha⁻¹)
DC (%)	0	200	250	300
65	6,0a	13,0a	9,3b	18,8a
75	8,8a	18,0a	19,3a	14,8a
85	6,0a	19,3a	11,5ab	12,8a
95	6,0a	15,8a	16,5ab	15,8a
Means followed by the same lowercase letter in the column do not differ by Tukey's test at 5% probability. DC (%) = (Soil density in the field/Max proctor density) × 100.

Table 6.

Average value of root volume in cm³ for the forage plant Urochloa ruziziensis as affected by nitrogen (N) fertilization under different degrees of compression (DC).

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	7.36b	20.29a	21.08a	21.76a
Urochloa brizantha cv. MG-5 Vitória	4.73c	17.40b	18.93ab	21.29a
Urochloa ruzizienses	6.23c	23.14b	25.14ab	26.45a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 7.

Average crude protein (CP) values in % DM for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	73.72a	66.21b	64.07b	64.13b
Urochloa brizantha cv. MG-5 Vitória	75.18a	67.41b	64.56b	64.34b
Urochloa ruzizienses	66.55a	55.32b	55.75b	56.56b
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 8.

Average values of neutral detergent fiber (NDF) in % DM for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	36.06a	31.71b	30.09b	30.67b
Urochloa brizantha cv. MG-5 Vitória	36.59a	32.97b	30.58b	30.81b
Urochloa ruzizienses	31.36a	24.37b	24.07b	25.22b
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 9.

Average values of acid detergent fiber (ADF) in % DM for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.

Forage species	Doses of N (kg·ha⁻¹)
Forage species	0	200	250	300
Megathyrsus maximum cv. Mombaça	4.50a	3.96a	3.08a	3.17a
Urochloa brizantha cv. MG-5 Vitória	3.11a	4.61a	3.51a	5.29a
Urochloa ruzizienses	2.70a	3.01a	2.67a	3.08a
Averages followed by the same lowercase letter in the row do not differ by the Tukey test at 5% probability.

Table 10.

Average values of lignin in % DM for the forage plants Megathyrsus maximum cv. Mombaça, Urochloa brizantha cv. MG-5 Vitória and Urochloa ruziziensis under different doses of nitrogen (N) kg·ha⁻¹ in UFVJM, Diamantina, 2016.