الفهرس 
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Abstract
Objective:The aim of the study was to study the effect of different irrigation intervals on sweet pepper plant and treated with humic acid under the environmental conditions of El-Hawawsha Village, Dakahlia Governorate, Egypt. Methods & Results: Two field experiments were carried out at the private field in El-Hawawsha Village, Dakahlia Governorate, Egypt, during the two successive summer seasons of 2016 and 2017 to investigate the effect of irrigation intervals and humic acid application as well as their interaction on growth and productivity of sweet pepper (Capsicum annuum L.) variety ”California wonder”.The experiments were carried out in split-plots design with three replications as follow: a- The main-plots were assigned to three different irrigation intervals as follows: 1- Irrigation every 10 days. 2- Irrigation every 15 days. 3- Irrigation every 20 days.b- The sub-plots were allocated with the following five treatments of humic acid application as follow: 1- Humic acid soil application (2 kg/fed). 2- Humic acid soil application (3 kg/fed). 3- Humic acid foliar application (1 g/L). 4- Humic acid foliar application (2 g/L). 5- Control spraying with tub water.The best irrigation interval was irrigation every 15 days and the best application by humic acid was soil application with humic acid at the rate of 3 kg/fed because its gave the highest values of vegetative growth, flowering characterisitics, yield and it components and other characterisitics. Conclusion:It could be concluded that sowing sweet pepper plant (California wonder cultivar) under similar conditions for local consumption and exportable which irrigated every 15 days interval and soil with humic acid at the rate of 3 kg/fed achieve the highest growth, yield, quality of sweet pepper plant. It has been noticed that California wonder cultivar of sweet pepper significantly responded to irrigation intervals and humic acid applications, thus it must conduct more researches for improving production and quality under local environmental conditions.