Comparison of sorghum classes for grain and forage yield and forage nutritive value

Bean, B.W. and Baumhardt, R.L. and McCollum III, F.T. and McCuistion, K.C. (2013) Comparison of sorghum classes for grain and forage yield and forage nutritive value. Field Crops Research, 142. pp. 20-26.

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Sorghum (Sorghum bicolor (L.) Moench), including sorghum-sudan crosses [S. bicolor subsp. Drummondii (Nees ex Steud) de Wet & Harlan] (SS), represents a broad category of plants that includes those grown primarily for forage or grain. Sorghum cultivars can be further classified as brown midrib (BMR), nonBMR, photoperiod sensitive (PS) and nonPS. The objective of our study was to compare sorghum classes comprised of multiple cultivars in relation to forage and grain yield, agronomic characteristics (i.e. height, lodging, moisture at harvest), nutrient composition and fiber digestibility. Although common properties among different sorghum classes were detected, consistent differences in forage yield and quality factors emerged between classes. The study mean SS-PS forage yield of 19.0 Mg ha−1 was significantly (P = 0.05) greater than all other non-PS classes and the FS-BMR class consistently yielded less than the corresponding FS class with an average reduction of 2.2 Mg ha−1. Grain yield varied greatly among the forage sorghum (FS) and FS-BMR cultivars, ranging from 2.30 to 7.54 Mg ha−1 with some FS cultivars yielding as much as those in the grain class. Those sorghum classes with the BMR trait consistently had the lowest acid detergent fiber (ADF) and neutral detergent fiber (NDF), and were lower in lignin content. The BMR trait also increased digestibility of the NDF fraction (NDFD). In vitro-true-digestibility (IVTD) was highest with FS-BMR and grain sorghum (Grain) classes followed by the FS, FS-PS-BMR and SS classes with the SS-PS consistently having the lowest IVTD. Although mean percent IVTD among sorghum classes descended in the same order as was observed for the grain yield, we identified very little correlation (r = 0.28) between grain yield and IVTD. Lodging was not increased in BMR cultivars compared with the nonBMR cultivars when harvested at the soft-dough stage and there was little correlation between lodging and lignin content, grain yield, or plant height.

Item Type: Article
Uncontrolled Keywords: Sorghum, Forage sorghum, Brown midrib, Photoperiod sensitive, Yield, Digestibility
Author Affiliation: Texas AgriLife Research and Extension Center, 6500 Amarillo Blvd. W., Amarillo, TX 76502, USA
Subjects: Crop Improvement
Divisions: Sorghum
Depositing User: Mr Siva Shankar
Date Deposited: 31 Dec 2012 06:26
Last Modified: 31 Dec 2012 06:26
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