DOI: 10.14704/nq.2022.20.8.NQ44467

Effect of Nitrogen Fertilization ,Spraying with Prepared Calcium Hmate-Fulvate Fertilizer and Fungicide on Resistance to Early Blight of Tomato Crop Disease Lycopersicon esculentum Mill.

Yahya H. Mansie, Hayfaa J. Hussein, Mohammed A. Fayyadh

Abstract

A field experiment was conducted in Al-Zubair area, southern of Iraq, In loamy sand soil to investigate the effect of three different levels of nitrogen fertilizer and spraying with prepared calcium humate – Fulvate fertilizers and fungicide (Scor) in controlling early blight on tomato Lycopersicon esculentum Mill caused by the fungus Alternaria solani during Agricultural season 2020- 2021. The results of the study showed a significant effect of the single study treatments and that the nitrogen level of 200 kg N ha-1 was the most efficient in reducing the severity of infection and increasing the concentration of phenols in leaves and the percentage of infected fruits compared with other treatments. While calcium humate-fulvate at concentration 0.4% and 0.8% treatments were significantly superior in an increasing the concentration of total phenols and decreasing the severity of infestation on leaves and the percentage of infested fruits compared to the control treatment.The results also showed a significant superiority of the fungicide and that the concentration of 0.5 and 1ml L-1 was the most effective in reducing the severity of infestation on leaves and the percentage of infected fruits, while the results did not show a significant effect of the fungicide on the concentration of phenols in leaves. The results also showed that the triple interaction treatment of nitrogen and fungicide at the comparison level + calcium humate- fulphate 0.4% and 0.8% was more efficient in reducing the percentage of infected fruits.While treatment of 200kg N ha-1 + fungicide treatments 0.5 and 1 ml L-1 + treatment of calcium humate - fulvate 0.4% was the best in reducing the severity of infestation on leaves.Also, the triple interaction treatment of nitrogen at the comparison level + the fungicide treatments 0.5 and 1 ml L-1 + the treatments of calcium humate - fulvate 0.4% and 0.8% was the best in reducing the percentage of infected fruits.

Keywords

Tomato, Calcium humate -fulvate, Fungicide, early blight

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