Abstract
The objective of this study was to evaluate the dry matter production and morphological parameters of sorghum and brachiaria (signalgrass, specifically palisade grass) grown simultaneously for forage production, along with the formation of soil cover in the off-season. The treatments were in a randomized block design and consisted of three different sowing arrangements: sorghum + two rows of brachiaria (between sorghum rows), sorghum + two rows of brachiaria (one in the row + another between the sorghum rows), and sorghum with brachiaria broadcast; as well as sorghum and brachiaria grown in monoculture. The dry matter yield of sorghum in the 1st cycle was higher in the arrangement of sorghum alone, obtaining around 12.01 t ha -1 . The highest total dry matter yield was obtained in the arrangement of sorghum with broadcast brachiaria, with 11.01 t ha -1 for sorghum and 3.75 t ha ‑1 for the brachiaria. In the 2nd cycle, soil cover was greatest in the brachiaria monoculture and in the arrangement of sorghum with broadcast brachiaria, at 95% and 86%, respectively. With the aim of producing forage sorghum together with the formation of adequate soil cover by brachiaria, the arrangement of sorghum with broadcast brachiaria is promising.
Highlights
Resumo – O estudo objetivou avaliar a produção de matéria seca e parâmetros morfológicos de sorgo e braquiária em cultivo simultâneo, visando a produção de forragem concomitantemente à formação da cobertura de solo na entressafra
The soil chemical analyses were performed in the laboratory of the soil department of the Universidade Federal de Viçosa and the results consisted of pH 5.4, phosphorus (P) 5.9 mg dm-3, potassium (K) 44 mg dm-3, calcium (Ca2+) 2.61 cmolcdm-3, magnesium (Mg2+) 0.97 cmolc dm-3, aluminum (Al3+) 0 cmolcdm-3, hydrogen + aluminum (H+Al) 3 cmolcdm-3, sum of bases 3.69 cmolcdm3, base saturation 55.2%, aluminum saturation 0%, organic matter (OM) 2.15 dagkg-1, and residual phosphorus (P-res) 31.2 mg L-1
The analyses were conducted according to the following methodologies: Mehlich-1 extractant for P and K; 1 mol/L KCl extractants for Ca2+, Mg2+, and Al3+; 0.5 mol L-1 calcium acetate extractant at pH 7.0 for H + Al; for the soil organic matter (OM) determination
Summary
Resumo – O estudo objetivou avaliar a produção de matéria seca e parâmetros morfológicos de sorgo e braquiária em cultivo simultâneo, visando a produção de forragem concomitantemente à formação da cobertura de solo na entressafra. Aiming to produce the maximum amount of pasture biomass or a no-till system, the simultaneous growth of two or more fall-winter crops may be most appropriate Supporting this assertion, several authors have found a high plant biomass production in simultaneous growth of sorghum and brachiaria grasses (Borghi et al, 2013; Neto et al, 2014; Ribeiro et al, 2015). There are no graminicides to stall the growth of brachiaria competing with the sorghum crop Another gap observed in this area is the absence of studies monitoring the pasture formation and vegetative matter production of regrowth followed by straw cover after sorghum harvest. This study aimed to evaluate arrangements of sowing forage sorghum with brachiaria aiming at sorghum silage production and the formation of soil cover for no-till planting
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