草业学报2019，Vol.28Issue(1)：108-119,12.DOI:10.11686/cyxb2018426
甘肃荒漠灌区播量和行距对紫花苜蓿营养价值的影响
Effects of seeding rate and row spacing on nutritional value of alfalfa in the arid oasis region of Gansu Province
摘要
Abstract
Seeding rate and row spacing are important cultivation details for alfalfa (Medicago sativa) need to be optimized to achieve high crop yield and forage quality.Therefore, an experiment to investigate the effect of seeding rate and row spacing on alfalfa performance was carried out in the arid oasis region of Gansu Province from 2014 to 2017.The experiment comprised four seeding rates (12.0, 16.0, 20.0 and 24.0kg·ha-1) arranged in a r andomized complete block design with three replicates, and three equal row spacings (10, 15, 20cm) and two wide-narrow row spacings (60cm+40cm, and 60cm+30cm) r andomly arranged as split plot treatments within the main plots.In wide-narrow row spacings, groups of 6rows with a narrow spacing of 10cm were separated by a wider spacing of 30cm or 40cm.It was found that seeding rate and row spacing did not have any significant effect on leaf:stem ratio, but significantly affected nutritional parameters of alfalfa forage.Across the range of seeding rates and row spacings, herbage ether extract, calcium, and phosphorus contents were highest at intermediate plant densities.Crude protein content was highest (20.06％ ) at the 16.0kg·ha-1seeding rate and 20cm row spacing combination, while the highest ether extract content (3.42％ ) was obtained at the 16.0kg·ha-1 seeding rate with 15cm row spacing.Calcium content was maximized (1.65％ ) at the 20kg·ha-1 seeding rate and 20cm row spacing, and phosphorus (P) content was maximized (0.19％ ) at the 3lower seeding rates (12.0, 16.0 and 20.0kg·ha-1) and row spacing of 20cm.The neutral detergent fiber (NDF) and acid detergent fiber (ADF) contents decreased with increasing seeding rates, while the NDF and ADF contents increased with increasing row spacings, and the lowest average NDF content (31.74％ ) was obtained at the 24.0kg·ha-1 seeding rate and 10cm row spacing.The lowest ADF content (25.64％ ) was obtained at the 24.0kg·ha-1 seeding rate and 15cm row spacing.The relative feed value (RFV) increased with increasing seeding rates and was highest at medium row spacings.Lastly, relative feed value was maximized (208.64％ ) at the 16.0kg·ha-1 seeding rate and 20cm row spacing.The nutritional values of alfalfa herbage different between growing years at the same seeding rate and row spacing.It was indicated from comprehensive evaluation of the main nutrients, that the optimal planting configuration for improving alfalfa nutritional value in this climate was a seeding rate of 20.0kg·ha-1 and row spacing of 20cm.关键词
紫花苜蓿/荒漠灌区/叶茎比/灰色关联度分析Key words
alfalfa/arid oasis region/leaf:stem ratio/grey relational analysis引用本文复制引用
南丽丽,师尚礼,郭全恩,白小明..甘肃荒漠灌区播量和行距对紫花苜蓿营养价值的影响[J].草业学报,2019,28(1):108-119,12.基金项目
农业部行业专项子课题(201403048-8),国家自然基金(31460630)和草业生态系统教育部重点实验室开放课题(2017-D-05)资助 （201403048-8）
