Effects of nitrogen application on seed yield and nitrogen accumulation in alfalfa (Medicago sativa)

doi:10.11686/cyxb2016265

Abstract

Abstract: To investigate nitrogen (N) uptake, N fertilizer management and N utilization in alfalfa (Medicago sativa) seed crops a field experiment with four N treatments (0, 45, 90, and 135 kg N/ha) and two alfalfa cultivars, Aohan and Gongnong No.1 was established to compare the effects of N application on seed yield, seed quality, N harvest index and the dynamics of N accumulation and distribution in alfalfa plants. The results showed that the seed yield and N harvest index were decreased while the pod setting rate, seed weight per plant, 1000 seed weight and seed quality of both cultivars were increased with increased N application. The dynamic changes of N accumulation and distribution were influenced by cultivar. The optimum N application rate for Aohan was 45 kg N/ha at the budding stage and 90 kg N/ha at the podding stage whereas the optimum N application rate for Gongnong No.1 was 45 kg N/ha at flowering stage and 45 kg N/ha at podding stage. The initial results confirmed the value of N fertilizer application and the regulation of N fertilizer requirements in alfalfa seed crops in the Chifeng area, and provided useful information for the determination of appropriate N fertilizer use in alfalfa seed crops.

CHEN Ling-Ling, REN Wei, MAO Pei-Sheng, WU Ren-Tu-Ya, WANG Sheng-Nan, LIANG Qing-Wei. Effects of nitrogen application on seed yield and nitrogen accumulation in alfalfa (Medicago sativa)[J]. Acta Prataculturae Sinica, 2017, 26(6): 98-104.

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