Abstract
The present work has been performed to study the growth and metabolic activities of three broad bean cultivars (Giza 843, Sakha 1, and Giza 716) which are shown to have different response to sewage sludge applications and to determine the effects of phytohormones IAA or SA. Along with identifying the mechanisms of broad bean response and the role of growth regulators (200 ppm of IAA or 10 mM of SA) in counteract sewage sludge effects is examined. The situation can be recorded that growth parameters fresh, dry matter and water content of pods were significantly increased as increasing SSL in cultivars 843 and in Sakha up to 70% level. However, these parameters were markedly decreased as increasing SSL in cv. Giza 716. Length and number of pods were unchanged in cv. Sakha 1, increased in cv. Giza 843 while they decreased in cv. Giza 716 with increasing SSL. Phytohormonal application stimulated growth parameters in pods of three tested cultivars Giza 843, Sakha 1 and Giza 716 with sewage treatments. Soluble sugar and soluble protein content decreased as increasing SSL in both cv. Sakha 1 and cv. Giza 716. In cv. Giza 843, soluble sugar was significantly increased while soluble protein was decreased as increasing SSL. Proline content was unchanged in cv. Sakha 1, increased in cv. Giza 716 while decreased in cv. Giza 843. Metabolites (soluble sugar, soluble protein and proline) showed variations in three broad bean cultivars to IAA or SA application plus sewage sludge treatments. In cv. Giza 716 SS treatment increased Zn, Ni, PB and Cu. In cv. Giza 843 SS treatment decreased Zn, Pb, and Cu while increased Ni. In cv. Sakha 1 SS treatment decreased Zn, Ni, Pb and Cu. Phytohormonal treatments showed an increasing or decreasing effect in heavy metal in three tested cultivars.
Highlights
Agriculture actions in the El-Minia distinct of central Egypt hinge on water removal from the River Nile along secondary canals
Metabolites showed variations in three broad bean cultivars to IAA or SA application plus sewage sludge treatments
From the present results it can be demonstrated a variable response of three broad bean cultivars to increase sewage sludge levels
Summary
Agriculture actions in the El-Minia distinct of central Egypt hinge on water removal from the River Nile along secondary canals. A result of the constant rise in the water quantity, soil strength and salt concentrations are affected, which clues to problems of water logging For these reasons, drilling of the El-Moheet drain is directed to decrease the water level, mainly on the western bank of the Nile Valley. Sewage sludge is waste organic wide and biogenic compounds especially nitrogen and phosphorus which are essential for plant growth [5] [6] [7]. It contains heavy metals in addition to those classified as poisonous (Cd, Cr, Cu, Hg, Ni, Pb and Z) [8] [9]. The present work was carried out to illustrate the effect of sewage sludge and interactive with phytohormones (IAA or SA) on growth, metabolites and heavy metals on three broad bean cultivars
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