草业学报2016，Vol.25Issue(3)：154-164,11.DOI:10.11686/cyxb2015269
灌溉次数和施肥量对甘肃引黄灌区紫花苜蓿种子产量的影响
Effects of irrigation frequency and fertilizer rate on alfalfa seed yields in the Yellow River irrigated region
摘要
Abstract
Given crop demand for water in the Yellow River irrigation region of Gansu province,irrigation needs to be supplied for fixed periods.To explore optimum irrigation strategies and fertilizing methods,the effects of different irrigation frequencies (two,three and four times)and application rates of phosphate diamine (0,180, 360,540 kg/ha)on alfalfa seed yield and yield components were studied.The results showed significant differ-ences in seed yield for the different irrigation frequencies (P <0.01).Seed yield decreased with increased irriga-tion frequency.Irrigating two times was suitable for local alfalfa seed production,with the average yields in 2013 and 2014 being 686 and 891 kg/ha respectively.With increased fertilizer rates,actual seed yield first in-creased and then decreased,with the highest yields achieved under a fertilizer rate of 360 kg/ha (average yields in 2013 and 2014 were 631 and 786 kg/ha respectively).Irrigation frequency and fertilizer rate interacted in terms of alfalfa seed yield.Under two-times and three-times irrigation,increasing fertilizer rates could improve seed yield significantly.Under four-times irrigation,with increased fertilizer rates the seed yields first in-creased and then decreased.In 2013,the highest actual seed yields (757.28 kg/ha)were obtained with two-times irrigation and a fertilizer rate of 360 kg/ha.In 2014,the highest actual seed yields (1018.75 kg/ha)were obtained with two-times irrigation and a fertilizer rate of 540 kg/ha.Alfalfa seed yield had significant correla-tions with effective fertile tiller number (R 2 =0.503)and inflorescence number (R 2 =0.835 ).In summary, two-times irrigation and a fertilizer rate of 360 kg/ha are recommended for local alfalfa seed production.关键词
紫花苜蓿/灌溉次数/施肥量/种子产量Key words
alfalfa/irrigation times/fertilizer rate/seed yields引用本文复制引用
陈冬冬,王彦荣,韩云华..灌溉次数和施肥量对甘肃引黄灌区紫花苜蓿种子产量的影响[J].草业学报,2016,25(3):154-164,11.基金项目
草地农业生态系统国家重点实验室，兰州大学中央高校基本科研业务费专项资金（lzujbky-2015-40）和公益性行业（农业）科研专项经费（201403048-3）资助。 （）
