Effect of sewage sludge amendment on some growth parameters in Cotton plants
2011
El-Tayeh, N.A.
Sand culture technique was employed to investigate the effect of sewage sludge amendment on water content, dry matter, chlorophylls content and some carbon and nitrogen metabolites in cotton plants. The investigations were carried out under natural conditions using the reclaimed sewage sludge of EI-Salhya sewage station at Qena city. The sludge was mixed with sand at three levels: 10%,20% and 30%. The sand was used (without sludge) as control. Results revealed that the amendment of soil sludge reduce the pH of soil and increase electric conductivity and total soluble salts with increasing the sludge level. The investigated plants grown on soil amended with sewage sludge levels showed a significant increase in chloropbylls content and chlorophyll a/b ratio was lower than in control plants. The highest dry matter accumulation was recorded by application 20% sludge that increases by 3 fold of that of control plants. Results indicated also that the soluble sugars and hydrolysable sugars were increased significantly by sludge application comparing with control. Although content of total amino acids decreased significantly in roots of test plants by elevating sewage sludge levels, the contents of soluble proteins increased significantly with respect to control plants. However, soluble proteins in shoots of plants decreased remarkably by increasing sewage sludge levels at 30% sludge level. In the present study, protein content in plants increased with sludge amendment ratio increased as compared to those grown in unamended soil. It can be concluded that application of sewage sludge improved the physico-chemical properties of the sandy soil to be more suitable for cultivation.
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