摘要
为研究种植年限对紫花苜蓿生产力和营养品质的影响,筛选紫花苜蓿适宜种植年限,为银川地区紫花苜蓿草产业发展提供理论依据。以种植年限1至10年"金皇后"紫花苜蓿为试验材料,对影响紫花苜蓿生产力的株高、分枝数、干草产量等指标以及影响营养品质的CP、RFV等指标进行测定分析,采用隶属函数对其进行综合评价。结果表明,随着种植年限的增加,株高呈先升高后降低的变化趋势,在第5年达到最大值,与第4年差异不显著(P>0.05),与其他年限株高差异显著(P<0.05);分枝数呈现不规则变化;干草产量变化趋势为先增加后降低,在第4年达到最大值,与其他年限干草产量呈显著差异(P<0.05);CP含量和RFV随着种植年限的增加而降低,两项指标由种植1年时的21.43%DM、121.71%DM下降至种植10年时的17.01%DM、97.83%DM,分别降低20.63%、19.62%。综合考虑干草产量和营养品质变化情况,本研究表明种植年限为4~5年的苜蓿在生产性能和营养品质方面的综合效果最佳,最适利用年限为种植后第4~5年。
In order to study the effects of alfalfa with growth years on the productivity and quality, to choose the proper growth years, and provide theoretical basis for alfalfa industry. The growth years of one year to ten years alfalfa plants were used as experimental material, analysis the nutritive value （CP, RFV） and the productive performance （plant height, branch numbers, hay production and other factors）, the Gray system theory was used for comprehensive evaluation. The results showed that, with the increasing of growth years, plant height was first increased and then reduced, and it reached the peak on fifth year, and it was no significant difference with the fourth year （P 〉 0. 05）, while it showed significant difference with other years （ P 〈 0. 05 ） ; the branch numbers showed irregular change ; the hay production was first increased and then reduced, and it reached the maximum on fifth year, and it showed significant difference with other years （ P 〈 0. 05）; the CP and RFV were first increased and then reduced with the increasing of growth years, and it reduced from 21.43 % DM, 121.71% DM of first year to 17.01% DM, 97. 83 % DM of tenth years, and it reduced 20. 63%, 19. 62%, respectively. In comprehension the hay production and nutritive value, the research conclude that on the fourth to fifth year after planting could get the best production ability and nutritive value, and the best utilize year was the fourth to fifth years after planting.
出处
《草学》
2017年第4期11-17,共7页
Journal of Grassland and Forage Science
基金
现代农业产业技术体系(CARS-35)资助
关键词
紫花苜蓿
生物学特性
生产力
营养品质
种植年限
Alfalfa
biological characteristics
production ability
nutritive value
growth years
