Role of Some Stimulants Materials for Improve Growth, Yield and Quality of Color Sweet Pepper Hybrids Under Plastic Houses Conditions.

Growth, yield, and quality for two hybrids of color sweet pepper as influenced by some stimulantmaterials i-e chitosan with concentration (250 ppm), melatonin with (50 ppm) and potassium silicate with(2000 ppm) in addition to control. were studied. The experiments were carried out in two successiveseasons 2021/ 2022 and 2022/ 2023 at the farm and laboratories of the Horticulture Department Faculty ofAgriculture Minia University, El Minia Governorate, Egypt, under plastic house conditions. Theexperiment was laid out as CRBD in the split plots design where the two hybrids were done out in themain plot and the stimulant materials were distributed in a subplot with three replicates. The resultsrevealed that most growth parameters, yield, and its components such as average fruit weight and thenumber of fruits/plant in addition to some fruit quality i-e fruit wall thickness were improved significantlyafter spraying these materials compared to control plants (those plants which sprayed with water). Amongthese materials spraying plants with potassium silicate improved the number of fruits/plant, number ofbranches/plant, fresh weight of plant, and total yield. While spraying with melatonin had improved theaverage fruit weight, average fruit length, and dry weight of the plant, on the other hand spraying withchitosan had improved the average plant height.