Field assessment of efficacy of nitrogen salts to control the root-knot nematode (Meloidogyne javanica) on tomato
2014
Karajeh, Muwaffaq R. | Al-Nasir, Farah M.
Influence of different nitrogen salts at electrical conductivity levels (EC2, 4 and 8 mmhos/cm) on tomato and root-knot nematode (Meloidogyne javanica) and their interactions was evaluated under field conditions. It was found that both diammonium phosphate ((NH ₄) ₂HPO ₄) and ammonium sulphate ((NH ₄) ₂SO ₄) were more effective than ammonium chloride (NH ₄Cl) in causing an obvious suppression of M. javanica infection on tomato through reducing root galling and nematode reproduction and improving tomato growth and yield and their suppressive effect was similar to that of oxamyl or ethoprophos. At higher ECs, the tested nitrogen salts did not greatly affect pH, EC and salinity of rhizospheric soil except NH ₄Cl at EC8 that caused higher EC and salinity over the untreated control which makes NH ₄Cl less suitable candidate. Therefore, the use of (NH ₄) ₂HPO ₄ and (NH ₄) ₂SO ₄ alone or in combination with other control measures could control M. javanica and improve the growth and yield of tomato under field conditions.
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