摘要
【目的】通过研究不同水肥组合对苜蓿干草产量和营养品质的影响,探明西北荒漠灌区紫花苜蓿合理的水肥管理模式.【方法】以不同程度水分调控水平(土壤含水量下限占田间持水量百分比)45%～55%(W_0)、55%～65%(W_1)、65%～75%(W_2)、75%～85%(W_3)为主处理,不同施氮水平(N0:0kg/hm^2、N1:60kg/hm^2、N_2:120kg/hm^2、N_3:180kg/hm^2)为副处理进行两因素随机区组试验.【结果】在同一水分条件下,随施氮肥水平的提高,苜蓿干草产量和粗蛋白含量呈先增加后降低的变化,酸性洗涤纤维(ADF)和中性洗涤纤维(NDF)含量呈先降低后升高的变化趋势;同一施肥水平下,随水分调控程度的减轻,干草产量和粗蛋白含量呈先增加后减小的变化,ADF和NDF含量呈先减小后增加的变化趋势.水肥交互作用下,苜蓿产量和营养品质对水分的响应较施肥作用的影响更加敏感,W_2N_2较W_3N_3处理全生长期干草产量增加了206.51kg/hm^2,低于W_3N_2处理,但差异不显著(P>0.05);在W_2N_2处理下粗蛋白含量最高,ADF和NDF含量最低,全生长期相对饲喂价值(RFV)值最大为204.1.【结论】W_2N_2水肥调控处理组为苜蓿最佳水肥组合,有利于提高西北荒漠灌区紫花苜蓿干草产量和营养品质.
【Objective】In order to explore the proper management system of water and fertilizer supplies for alfalfa in irrigated area in northwestern desert zone.【Method】Water regulation was used as the main treatment(percentage of field water capacity),including 4irrigation levels(45%to 55%,W0;55%to65%,W1;65%to 75%,W275%to 85%,W3)and sub-treatment was nitrogen fertilization including 4levels(0kg/hm2,N0;60kg/hm2,N1;120kg/hm2,N2 and 180kg/hm2,N3).The effects of treatments on hay yield,crude protein(CP),acid detergent fiber(ADF),neutral detergent fiber(NDF)and relative feed val-ue(RFV)of alfalfa were studied.【Result】Under same water condition,the yield of hay and CP increased first and then decreased with the increase of fertilization level,and the content of ADF and NDF firstly decreased and then increased.Under same fertilization level,with the reduction of irrigation amount,hay yield and CP content increased first and then decreased,ADF and NDF contents decreased first and then increased.Compared to fertilization,the yield and nutritional quality of alfalfa were more responsible to irrigation.The hay yield in W3N2 treatment was the highest,and followed by W2N2 treatment,but no significant difference among them(P>0.05),and 206.51kg/hm2 higher than W3N3 treatment.The content of CP was the highest,and the content of ADF and NDF was the lowest in W2N2 treatment.The maximum RFV occurred in W2N2treatment(204.1).【Conclusion】The best treatment was W2N2 in terms of hay yield and nutritional quality.
作者
马彦麟
齐广平
汪精海
康燕霞
史晓巍
贾涪钧
栗志
MA Yan-Iin;QI Guang-ping;WANG Jing-hai;KANG Yan-xia;SHI Xiao-wei;JIA Fu-jun;LI Zhi(College of Water Conservancy and Hydropower Engineering,Gansu Agricultural University,Lanzhou 730070,China;Yangliuqing Forage and Feed Development Limited Company,Lanzhou 730030,China)
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2018年第6期171-179,186,共10页
Journal of Gansu Agricultural University
基金
国家自然科学基金项目(51669002)
国家重点研发计划"水资源高效利用专项"(2016YFC0400306)
农业行业专项(201403048)
农业生物技术研究与应用开发项目(GNSW-2016-26)
甘肃省自然科学基金项目(1606BJYA251)
甘肃省自然科学基金项目(1610RJZA086)
关键词
水肥调控
紫花苜蓿
产量
营养品质
相对饲喂价值
regulation of water and fertilizer
alfalfa
yield
nutritional quality
relative feed value
