Allelopathic Effect of Wheat (Var. AbuGharaib 3) on Growth and Physiological Traits of Two Wheat Cultivars

The study included two experiments. The first one was done in the laboratory to show the effect of aquatic extracts of wheat residues Abu-Ghraib-3 with the concentrations 5% and 10% in addition to the control treatment on two cultivars of wheat: Abu-Ghraib-3 and Aqsad-65. The greenhouse experiment included the addition of 10 day decayed wheat residues, these residues were used after good mixing with the pots soil with the ratio 2.5 and 5% W/W in addition to the control which represent a soil without residues under three levels of moisture content 50, 75 and 100% to identify its effect on some physiological characteristics and yield of the two studied cultivars. The result of the laboratory experiment indicated that the aquatic extracts of wheat residues reduced the germination in both varieties. Moreover, the greenhouse experiment showed that the addition of residues especially with the ratio 5% inhibited some important features such as relative water content, proline root diameter and grain yield. While the moisture levels increased the relative water content roots diameter. It was very clear that cultivar Aqsad-65-was superior over Abu-Ghraib-3. On the other hand, the interaction between soil moisture levels and concentrations of residues removed the negative effect of wheat residues to soil.