| Autor: |
Silva, Pedro H. F. da, Santos, Mércia V. F. dos, de Mello, Alexandre C. L., Silva, Tafnes B. Sales, Neto, Djalma E. Simões, da Silva, Valdson J., Dubeux Jr., José C. B., Coelho, Janerson J., Souza, Evaristo J. O. de, da Cunha, Márcio V. |
| Předmět: |
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| Zdroj: |
Crop & Pasture Science; 2023, Vol. 74 Issue 12, p1210-1222, 13p |
| Abstrakt: |
Context: Introducing legumes into grass-based forage systems may increase herbage nutritive value while reducing the need for inorganic nitrogen fertilisation. Grass–legume intercrops may also enhance herbage yield stability. Aim: We evaluated agronomic and nutritional traits of elephant grass (Cenchrus purpureus Schum.) genotypes grown as monocrops and mixed with butterfly pea (Clitoria ternatea L.). Methods: Elephant grass genotypes, two tall (Elephant B and IRI-381) and two dwarf (Mott and Taiwan A-146 2.37), were grown as monocultures or intercropped with butterfly pea in a 2-year trial. Herbage accumulation, yield stability, botanical composition and chemical/bromatological variables were evaluated. Key results: Herbage accumulation was highest (P < 0.001) in Elephant B under monocropping (21.9 t/ha.year); however, this treatment revealed the lowest yield stability over harvest times (σ i2 5.59). All intercrops were more stable than grass monocrops (mean σ i2 0.66 vs 2.55). Higher (P < 0.001) concentrations of herbage crude protein were found in intercrops than monocrops (mean 113 vs 90 g/kg). Intercrop herbage lignin contents (mean 57 g/kg) and protein fraction C (mean 61 g/kg) were higher than those in monocrops. Dwarf Mott had higher (P = 0.001) digestible dry matter concentration than dwarf Taiwan (755 vs 745 g/kg). Conclusions: Dwarf Mott genotype has outstanding nutritive value because of its higher leaf:stem ratio. Butterfly pea legume added to elephant grass crop in cut-and-carry systems improves herbage yield stability by reducing seasonal effects. Implications: Intercropping butterfly pea in grass-based systems enhances yield stability, allowing herbage harvest with good nutritive value. This manuscript discusses herbage production and nutritive value of two tall and two dwarf genotypes of elephant grass grown as monocrops or mixed with butterfly pea legume. Herbage production showed less variation over harvest times in intercrops than in grass monocrops, and dwarf Mott displayed better nutritional value than dwarf Taiwan elephant grass. Adding butterfly pea to elephant grass-based systems reduces seasonal effects on herbage production over harvest times while providing good nutritional value. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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