Effects of cutting height managements on yield and composition of different annual pastures

COMASSETO, Danielli dos Santos; RODRIGUES, Carine Rey; DORNELLES, Renata da Rosa; FALEIRO, Eduardo Avelino; PINTO, Augusto Gossmann; CASTAGNARA, Deise Dalazen; OAIGEN, Ricardo Pedroso; DEL VALLE, Tiago Antonio; AZEVEDO, Eduardo Bohrer de

doi:10.1590/S1519-99402121282020

Accessibility / Report Error

Brazil

Revista Brasileira de Saúde e Produção Animal

Português Español

Brazil

Português Español

table of contents « previous current next »

Table of contents

Forestry and Grassland • Rev. bras. saúde prod. anim. 21 • 2020 • https://doi.org/10.1590/S1519-99402121282020 copy

Effects of cutting height managements on yield and composition of different annual pastures

Efeito do manejo sobre a produção e composição de diferentes pastagens anuais

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed to evaluate the effects of different pre-cutting and residual heights of Pearl millet, Sudangrass, and Sorghum pastures on yield, morphological and chemical composition. The experimental design was the randomized blocks, with four experimental units per treatment. It was evaluated three species of forage: 1) Pearl millet (MIL; Pennisetum americanum); 2) Sudangrass (SUD; Sorghum sudanense); and 3) Sorghum (SOR; Sorghum bicolor); and two cutting managements: I) 50:20 - cutting height at 50 cm and 20 cm residual height; and II) 85:10 - cutting height at 85 cm and 10 cm residual height. Managements of cutting height affected neither forage yield per cut nor total forage yield. Sudangrass had less cuts than MIL and SOR when submitted to the 50:20 management. The 85:10 management increased stem proportion and leaf to stem ratio, and reduced leaf proportion in comparison with the 50:20 management. The 50:20 management reduced forage contents of fiber and organic matter, and increased forage contents of crude protein and total digestible nutrient. Sorghum exhibited greater nutritive value due to increased leaf proportion. The 50:20 management increased number of cuts and improved nutritive value of forages, regardless of species evaluated in this study.

Keywords:
Forage quality; Grassland; Intensive systems; Pastoralist strategies; Plant production

Item	Species¹ 1 Species: Pearl millet (MIL; Pennisetum americanum (L.) BRS 1503®, Embrapa); Sorghum (SOR; Sorghum bicolor 2501C); Sudangrass (SUD; Sorghum sudanense BRS Estribo®, Embrapa);			Managements² 2 Managements: 50:20 - cutting height at 50 cm and 20 cm residual height; and 85:10 - cutting height at 85 cm and 10 cm residual height;		SEM³ 3 Standard error of the mean;	Probabilities⁴ 4 Probabilities: effect of specie (MIL, SUD, and SOR); MAN (50:20 vs. 85:10); and SPE×MAN: specie and management interaction effect.
Item	MIL	SUD	SOR	50:20	85:10	SEM³ 3 Standard error of the mean;	SPE	MAN	SPE×MAN
Number of cuts	4.00	3.13	4.13	5.17	2.33	0.127	0.012	<0.001	0.028
Yield per cut (kg DM ha^-1)	2173	2099	1955	1197	2954	162.5	0.858	<0.001	0.490
Total yield (kg DM ha^-1)	6659	5728	6466	5896	6673	348.2	0.530	0.282	0.776

Item	Species¹ 1 Species: Pearl millet (MIL; Pennisetum americanum (L.) BRS 1503®, Embrapa); Sorghum (SOR; Sorghum bicolor 2501C); Sudangrass (SUD; Sorghum sudanense BRS Estribo®, Embrapa);			Management² 2 Managements: 50:20 - cutting height at 50 cm and 20 cm residual height; and 85:10 - cutting height at 85 cm and 10 cm residual height;		SEM³ 3 Standard error of mean;	Probabilities⁴ 4 Probabilities: effect of specie (MIL, SUD, and SOR); MAN (50:20 vs. 85:10); and SPE×MAN: specie and management interaction effect.
Item	MIL	SUD	SOR	50:20	85:10	SEM³ 3 Standard error of mean;	SPE	MAN	SPE×MAN
Morphological composition, g kg^-1 DM
Leaf	590^B	540^B	666^A	705	492	38.4	<0.001	<0.001	0.095
Stem	378^B	443^A	323^C	281	481	12.4	<0.001	<0.001	0.285
Inflorescence	24.3^A	6.79^B	5.65^B	7.30	17.2	2.862	0.010	0.097	0.153
Dead material	6.51	5.55	5.66	4.67	7.14	1.622	0.872	0.146	0.592
Leaf to stem ratio	1.56^AB	1.22^B	2.06^A	2.51	1.02	0.468	0.089	<0.001	0.145
Chemical composition, g kg^-1 DM
Dry matter, g kg^-1 as-fed	172^B	204^A	178^B	178	191	4.4	0.005	0.147	0.500
Neutral detergent fiber	688^AB	709^A	678^B	678	705	5.8	0.062	0.031	0.304
Acid detergent fiber	505	513	498	487	524	4.9	0.480	0.003	0.426
Cellulose	402	403	389	376	420	4.7	0.307	<0.001	0.563
Hemicellulose	184	180	187	190	177	4.0	0.725	0.130	0.771
Lignin	102^C	127^A	100^B	112	107	3.5	0.002	0.506	0.305
Crude protein	152	140	159	175	126	5.4	0.298	<0.001	0.257
Ash	127^A	97.1^C	114^B	108	117	2.6	<0.001	0.035	0.200
Total digestible nutrient	523	516	529	538	508	6.3	0.579	0.017	0.459

UFBA - Universidade Federal da Bahia Avenida Adhemar de Barros nº 500 - Ondina , CEP 41170-110 Salvador-BA Brasil, Tel. 55 71 32836725, Fax. 55 71 32836718 - Salvador - BA - Brazil
E-mail: rbspa@ufba.br

Stay informed of issues for this journal through your RSS reader

[1] *Mail for correspondence: ebazevedo@yahoo.com.br