TITLE:
Nutritive Value and Silage Fermentation Characteristics of Forage Sorghum (Sorghum bicolor L.) Genotypes and Lablab (Lablab purpureus L.) Mixture
AUTHORS:
M. Rangappa Umesh, Isaac Lepcha, Sultan Begna, Prasanna Gowda, Sangu Angadi
KEYWORDS:
Brown Midrib, Brachytic Dwarf, Ensilage, Forage Quality, Intercropping, Lablab, Silage
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.13 No.6,
June
14,
2022
ABSTRACT: This study was conducted to
assess the fermentation and nutritive value of sorghum silage mixed with lablab
at different proportions. The treatments consisted of a combination of two
sorghum genotypes viz. “Brown midrib” and “Brachytic dwarf” genotype of
lablab and six population proportions viz. 150:0, 112.5:37.5, 75:75,
37.5:112.5, 0:150 and 150:150 × 103 plants·ha-1 sorghum genotypes and lablab,
respectively totalling to 12 numbers. Sorghum genotypes and lablab were grown
as monocrop and in intercropping systems in the same field. Forage sorghum was
harvested at the late-dough stage and lablab at 20% bloom. They were cut and
chopped together and ensiled. Lablab in the silage mixture was its actual
contribution to the total forage mixture. For each mixture, a 1-L glass jar
(mini-silo) was filled with 500 g of fresh material and replicated four times. Forage
in mini silos was fermented for 60 days at room temperature (25°C). Pre
and post-silage dry samples were analysed for nutritive value and ensiled
samples were analysed for fermentation characteristics. There was no
significant difference in nutritive value between sorghum genotypes. The
greatest impact of mixing lablab with sorghum genotypes was on crude protein
(CP) and acid detergent fiber (ADF), but not
on neutral detergent fiber (NDF). Across treatments, CP, ADF pH, lactic,
and acetic acid concentrations increased as the proportion of LB was increased. The
results indicated that lablab as an intercrop with sorghum for greater DM yield
and forage and silage quality than respective monocrops.