Effects of irrigation frequency and fertilizer rate on alfalfa seed yields in the Yellow River irrigated region

doi:10.11686/cyxb2015269

Abstract

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 differences in seed yield for the different irrigation frequencies (P<0.01). Seed yield decreased with increased irrigation 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 increased 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 increased 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 correlations with effective fertile tiller number (R²=0.503) and inflorescence number (R²=0.835). In summary, two-times irrigation and a fertilizer rate of 360 kg/ha are recommended for local alfalfa seed production.

CHEN Dong-Dong, WANG Yan-Rong, HAN Yun-Hua. Effects of irrigation frequency and fertilizer rate on alfalfa seed yields in the Yellow River irrigated region[J]. Acta Prataculturae Sinica, 2016, 25(3): 154-163.

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