关键词: 大麦, 全株饲用, 品系选择, 赤霉素

Abstract:

Barley (Hordeum vulgare L.) is a good crop variety with high salt-tolerance and cold-resistance. Screening barley varieties (lines) as whole-crop forage use would efficiently improve the utilization of saline and alkali land to produce fresh grass in spring, thus promoting herbivorous animal raising. In this study, twenty-seven common barley lines were used to investigate the agronomic traits such as plant height, stem diameter and leaf-stem ratio, and grass yield of whole plant harvested at heading stage, and feeding quality related traits such as nonstructural carbohydrates (WSC), crude protein (CP), neutral detergent fiber (NDF) and in vitro dry matter digestibility (IVDMD), and then made a correlation analysis between these traits. Six different barley lines were used to investigate the effects of exogenous gibberellic acid (GA) on grass yield. According to grass yield and feeding quality, the lines that were suitable to use as whole-crop forage were R150, R153, R287, R143 and R295, which had a high grass yield and good feeding quality; the tiller number, stem diameter and plant height could be used as assisted selection traits for whole crop forage barley. The effects of GA on the grass yield were altering for different barley lines:for R154, R159 and R171, spraying GA at seedling stage could significantly increase grass yield, but for R195, the effect was not so significant, and for 134 the grass yield after GA treatment was lower than that of control; while for R169, only spraying 60 g·hm^-2 GA at seeding stage could increase the grass yield, but other GA treatments decreased grass yield. Therefore, it should be combined with the characteristics of barley varieties to select suitable time and concentration of GA application.

Key words: Barley, Whole-crop forage, Strain screening, Gibberellic acid