Competition in a rice - cowpea intercrop as affected by nitrogen fertilizer and plant population

Scientia Agricola

Frank Oke Oroka²  Anthony U. Omoregie¹ 

[1] ,Delta State University Dept. of Voc. Education (Agric Unit) Abraka,Nigeria

关键词: aggressivity index;    land equivalent ratio;    nitrogen utilization efficiency;    relative crowding coefficient;    índice de agrssividade;    razão de área equivalente;    eficiência do fertilizante;    coeficiente relativo de superpopulação;   

DOI  :  10.1590/S0103-90162007000600010

来源: SciELO

【 摘 要 】

The increased productivity or yield advantage provided by intercropping is attributed to a better use of resources by crops grown in mixtures, as compared to the same species grown in sole stands. In an intercropping system with upland rice and cowpea, the intra and inter-competition was quantified, as affected by plant population density and rate of nitrogen. Reductions in number of panicles per rice plant and number of grains per panicle were obtained with high density in both sole and mixture rice populations. Increasing nitrogen rate did not affect yield and yield components in both populations, but number and weight of pods per plant of cowpea in sole stands increased. Land equivalent ratios exceeding unity were obtained, indicating an improved resource use by the crop mixture. Relative crowding coefficient and aggressivity indices showed cowpea to be the dominant crop, with rice being dominated. Nitrogen utilization efficiency was high with intercrops, but was generally poor in stands of high population density.

【 授权许可】

CC BY   
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