Interactions among species play an important role in determining the structure and the dynamics of plant communities. The main objectives of the study were (i) to assess and compare different competition indices and their relationship with yield component under different inorganic and organic fertilizers regimes; and (ii), to identify nutrient management regimes options that lead to high yields and incomes in a maize-soybean intercropping system. Effects of integrated soil practices management on crop competition, yields components and economics advantage in maize-soybean intercropping system in a savannah region of the DR-Congo were investigated. Field trials were conducted at two sites in a randomized complete block design with six treatments replicated four times. Grain yield and yield components increased under integrated soil fertility management (ISFM) (inorganic or mineral and organic fertilization combined) than other treatments at Research ArticleAmerican Journal of Experimental Agriculture, 3(3): 520-541, 2013 521 the two sites of the study. Organic biomass application resulted in similar grain yield production than the inorganic (mineral) fertilizer application. The required land decreased when soil was fertilized compared to the control. Land equivalent coefficient (LEC) values ranged from 0.50 to 0.79. Soybean intercropped with maize resulted in an area-time equivalency ratio (ATER) higher than 1 for all the treatments confirming the intrinsic advantage of intercropping over sole crops. Among all the treatments, integrated nutrient management (ISFM) resulted in higher yields and monetary advantage index (MAI) values for maize/soybean mixture compared to other treatments. The highest MAI of 343891 was generated by the Tithonia (organic) -inorganic applications. Keywords: Cropping system; land equivalent ratio; land equivalent coefficient; area-time equivalency ratio; monetary advantage index; plant competition; maize and soybean yields; DR-Congo. Egbe OM. Evaluation of agronomic potentials of some pigeonpea genotypes for intercropping with maize and sorghum in Southern Guinea Savanna. Ph.D thesis, University of Agriculture, Makurdi, Nigeria; 2005. 59 Njoroge JM, Waithaka K, Chweya JA. Effects of intercropping young plants of the compact Arabica coffee hybrid cultivar. Ruiru Iwith potatoes, tomatoes, beans and maize on coffee yields and economic returns in Kenya. Expl.

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The study was carried out on the impact assessment of the form and nature of the different nitrogen sources used in culture on growth and nodulation of pigeon pea (Cajanus cajan (L.) Millsp) during 3 months of observation on sandy soil of Mount Amba (at the University of Kinshasa in the Democratic Republic of Congo). Height and collar diameter growth, underground and total biomass dry weight, number and dry pea nodules and nodulation index have been evaluated at 4, 6, 8, 10 and 12 weeks of growth to assess the response of the legume to mineral nitrogen and organic nitrogen from chickens manure and pig feces. After observations, it appears that all the treatments soil showed different effects on growth and nodulation of pigeon pea. Therefore, only the soil received 1 kg of pig feces stimulated (p ≤ 0.05) the development of pigeon pea which resulted in good growth (nodulation 116.8 nodules and nodulation index of 5.0) and biomass production (25.3 gr per plant) while the addition of chicken manure, whatever the dose, reduced them.

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