Regrowth of brachiariagrasses as related to stubble characteristics under N fertilization and irrigation. Issue 6 (7th September 2022)

• Record Type: Journal Article
• Authors: Lara, Márcio A. S.; Silva, Valdson J.; Pedreira, Carlos G. S.; Sollenberger, Lynn E.
• Is Part Of: Crop science. Volume 62:Issue 6(2022)
• Page Start: 2557
• Page End: 2567
• Publication Date: 2022-09-07
• Subjects: Crop science -- Periodicals; Cultures -- Périodiques; Cultures de plein champ -- Périodiques; Crop science; Nutzpflanzen; Zeitschrift; Pflanzenbau; Periodicals; 633
• DOI: 10.1002/csc2.20831
• Languages: English
• ISSNs: 0011-183X

Abstract

Abstract: Seasonal and annual changes in stubble characteristics can affect the regrowth of warm‐season perennial grasses. Understanding these changes and their effects on forage accumulation rate (FAR) can improve defoliation management. Our objective was to describe and relate variations in stubble characteristics with FAR during regrowth of four palisadegrasses [ Brachiaria brizantha (Hochst. Ex A. Rich.) Stapf. syn. Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster], genotypes Marandu, Xaraés, Arapoty, and Capiporã, and one signalgrass [ Brachiaria decumbens (Stapf.) syn. Urochloa decumbens (Stapf.) R.D. Webster] cultivar Basilisk, in southeastern Brazil. Plots were harvested at 15‐cm stubble height every 28 d during the warm season and 42 d during the cool season of years 2005–2006 and 2007–2008. Stubble mass was ∼1, 070 kg DM ha −1 greater in the cool than warm season, whereas FAR was less in the cool season. Arapoty and Basilisk showed generally less FAR (∼45 kg d −1 ) and stubble leaf, stem, dead material, and total mass during the warm season than more productive grasses Capiporã and Xaraés (∼63 kg d −1 ). Leaf and canopy photosynthesis varied over seasons and years, but they were similar among grasses despite differences in stubble characteristics and FAR. Marandu accumulated more leaf in the stubble than other grasses, resulting in greater residual leaf area index, but it did not increase FAR. Under less favorable growth conditions, grasses increased stubble herbage mass (SHM). More productive grasses generally present greater SHM and leaf mass, indicating that stubble characteristics play an important role in the regrowth of brachiariagrasses. Core Ideas: Stubble characteristics play an important role in the regrowth of brachiariagrasses. Grasses increased stubble herbage mass and reduced forage accumulation rate during the cool season. Marandu palisadegrass had greater stubble leaf mass, but similar accumulation rate to less productive grasses. Capiporã and Xaraés palisadegrasses had greater stubble herbage mass and forage accumulation rate.