Effect of Nitrogen Fertilizer and Seeding Rate on Yield of Alfalfa and Weeds
文献类型: 外文期刊
第一作者: He, Feng
作者: He, Feng;Li, Xianglin;Xie, Kaiyun
作者机构:
关键词: Nitrogen fertilizer;seeding rate;grassy weeds;broadleaf weeds;dry matter
期刊名称:POLISH JOURNAL OF ENVIRONMENTAL STUDIES ( 影响因子:1.699; 五年影响因子:1.654 )
ISSN: 1230-1485
年卷期: 2018 年 27 卷 2 期
页码:
收录情况: SCI
摘要: Applying nitrogen (N) to increase alfalfa (Medicago sativa L.) yield is a general practice in China that has caused serious weed infestation problems. Our objective was to determine the effect of N fertilizer and seeding rate on yields of alfalfa and weeds. The effects of four N fertilizer gradients (0, 50, 100, and 150 kg N hm(-2)) and five alfalfa seeding rates (0, 5, 7.5, 10, and 15 kg hm(-2)) were examined on dry matter of alfalfa and weeds using a three-year in situ controlled trial. The results showed:& para;& para;There were no significant differences among N fertilizer (N) for dry matter of alfalfa (DMA) during three years. Dry matter of grassy weeds (DMGW) and broadleaf weeds (DMBW) were significantly increased with the N fertilizer gradient in the seeding year.& para;& para;DMA was significantly increased with the seeding rates gradient in both 2012 and 2013. DMGW and DMBW were significantly decreased with the seeding rates gradient in all three years.& para;& para;Interactions between N fertilizer and seeding rates on DMA and DMBW in 2012 and DMGW and DMT in 2013 are significant (p<0.05). Although the study demonstrated that increasing seeding rate can suppress weed invasions, N fertilizer facilitated them.
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