الفهرس 
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Abstract
Two plant residues were used in this study namely Malva parviflora L.(M) and Artemisia judaica L.(A) species as a water extracts of the dry kindly powder residues at three different concentrations to obtain 15 different treatments in addition to control sample to indicate the allelopathic effect of the aqueous extract applied to cowpea plant (Vigna unguiculata (L.) Walp.). The cultivar seeds (creamy colour) are obtained from Agriculture Research Center, Dokki, Giza, Egypt. The plant was grown under field condition at north of Zagazig city, Sharkyia Governorate, Egypt in summer seasons (April to august) of 2008, 2009 and 2010. The treatment was done as 75 ml of each extract and applied just one day before irrigation. Some cations and anions were analyzed before and after planting together with organic matter content, electric conductivity, soil pH and moisture content. In addition, the recorded morphological growth parameters by each 15 day were done. Protein content, lipid and nitrate reductase enzyme activity carried out also for certain chosen treatments. The data obtained suggested that concentration at (10% Malva + 20% Artemisia) was the best for growth, yield and protein content of seeds. The data obtained reveals that the moisture content was decreased with all treatments other than control; the soil alkalinity also increased in control and decreased in other treatments. Electric conductivity increased with depth to some treatments while still less in all treatments as compared to control in precipitated with depth. On dealing with cations Ca++ and Mg++ were more abundant in surface on the verse of K+ and Na+ which were increased with depths for some treatments especially (10% Malva + 20% Artemisia) for K+ while apparently unchanged in case of Na+. On the other hand anion shows an inhibition for sulphate and chloride in surface samples as compared to control while each of CO3 and HCO3 was decreased in some treatments either superficially or with depth. Each of radicle and plumule length was suppressed for first 6 days to all treatments as compared to control in a manner follow the concentration gradient. The plant height and leaf number was seen best with mixture of (5% Malva + 10% Artemisia) treatment and greatly inhibited at 20% Malva or 20% Artemisia alone and this can be due to release of some allelochemicals to the soil through decomposition of our residues. The lipid except at high Artemisia vulgaris Protein on the other hand was increased significantly as well as nitrogen content. Nitrate reductase enzyme was also increased as a constant.