Study the effect of two organic fertilizers, methods of fertilization on productivity, pests and predatory insects associated with eggplant under modified climatic condition

Fatma S  Moursy; Doaa AM  Gad; Dalia  Adly; Ihab I  Sadek

doi:10.30574/gscbps.2021.16.1.0205

Authors

Fatma S Moursy Climate Modification Research Department, Central Laboratory for Agricultural Climate (CLAC), Agricultural Research Center (ARC), Giza, Egypt.
Doaa AM Gad Application of Agriculture Climate Research Department, Central Laboratory for Agricultural Climate (CLAC), Agricultural Research Center (ARC), Giza, Egypt.
Dalia Adly Biological Control Department, Plant Protection Research Institute, Agricultural Research Center (ARC), Giza, Egypt.
Ihab I Sadek Climate Modification Research Department, Central Laboratory for Agricultural Climate (CLAC), Agricultural Research Center (ARC), Giza, Egypt.

DOI:

https://doi.org/10.30574/gscbps.2021.16.1.0205

Keywords:

Eggplant, Compost tea, Humic acid, Method of fertilization, Pests, predatory insects

Abstract

This study investigated the effects of two organic fertilizer (compost tea and humic acid) compared to chemical fertilizer on plant growth, productivity, pests and predatory insects associated with eggplant Solanum melongena var. Black beauty under net house in 1^st of April at 2019 and 2020 seasons. Application of fertilizers through fertigation enhanced significantly number of leaves, stem fresh weight, average fruit weight and total fruit yield. Moreover, stem diameter, nitrogen content in leaves (%), phosphorus content in leaves (%), potassium content in leaves (%), number of fruits and total yield were enhanced significantly due to using compost tea. However, using the humic acid cause a significant enhancement in number of shoots, number of leaves, stem diameter and leaves fresh weight. In addition, application of compost tea through the fertigation cause a significant superiority in number of shoots, nitrogen content in leaves (%), phosphorus content in leaves (%), potassium content in leaves (%), number of fruits, average fruit weight and total yield. The highest significant values of leaves fresh weight and stem dry weight were mainly due using humic acid through foliar application. Three main pest species and seven different predators' species were recorded associated with pests on eggplant. The application of foliar and fertigation compost tea increased pest populations significantly compared with humic acid and control. But also, increase the predators' population.

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