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Overyielding and interspecific interactions mediated by nitrogen fertilization in strip intercropping of maize with faba bean, wheat and barley

文献类型： 外文期刊

作者： Li, Qiu-Zhu 1 ; Sun, Jian-Hao 2 ; Wei, Xiao-Jing 1 ; Christie, Peter 1 ; Zhang, Fu-Suo 1 ; Li, Long 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Minist Educ, Key Lab Plant & Soil Interact, Beijing 100193, Peoples R China

2.Gansu Acad Agr Sci, Inst Soils Fertilizers & Water Saving Agr, Lanzhou 730070, Peoples R China

3.Agrifood & Biosci Inst, Agrienvironm Branch, Belfast BT9 5PX, Antrim, North Ireland

关键词： interspecific competition.;Cereal/cereal intercropping;LER;N application rate;N acquisition;Internet resource.

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： Interspecific interactions and soil nitrogen supply levels affect intercropping productivity. We hypothesized that interspecific competition can be alleviated by increasing N application rate and yield advantage can be obtained in competitive systems. A field experiment was conducted in Wuwei, Gansu province in 2007 and 2008 to study intercropping of faba bean/maize, wheat/maize, barley/maize and the corresponding monocultures of faba bean (Vicia faba L.), wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and maize (Zea mays L.) with N application rates of 0, 75, 150, 225 and 300 kg N hap#. Total land equivalent ratios (TLER) were 1.22 for faba bean/maize, 1.16 for wheat/maize, and 1.13 for barley/maize intercropping over the 2-year study period. Maize was overyielding when intercropped with faba bean, but underyielding when intercropped with wheat or barley according to partial land equivalent ratios (PLER) based on grain yields of individual crops in intercropping and sole cropping. There was an interspecific facilitation between intercropped faba bean and maize, and interspecific competition between maize and either wheat or barley. The underyielding of maize was higher when intercropped with barley than with wheat. Fertilizer N alleviated competitive interactions in intercrops with adequate fertilizer N at 225 kg hap#. Yield advantage of intercropping can be acquired with adequate nitrogen supply, even in an intensive competitive system such as barley/maize intercropping. This is important when using intercropping to develop intensive farming systems with high inputs and high outputs.

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