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Plant densities and born fertilizer had a great importance among the agronomic factors that have a strong effect on plant productivity. For this reason, two experiments were performed at Kafralgraidh Village, Kafrelshiekh Governorate, Egypt, during 2018 and 2019 summer seasons using a strip-plot design with four replicates to investigate the effects of four plant densities (23333, 28000, 35000 and 46666 plant/fed) resulted from four hill spacing (30, 25, 20 and 15 cm), respectively and five boron foliar application i.e. without foliar spraying as control treatment, foliar spraying with water and three levels of boron foliar fertilizer (100, 150 and 200 ppm), on growth parameters, yield, its attributes, seeds oil content and its qualities of sunflower. The obtained results declared that plant densities significantly affected plant growth characters, yield, and its attributes and oil content as well as oil qualities. Results indicated that the maximum averages of total chlorophyll content, stem height, stem diameter, head diameter, 1000-achenes weight and achenes weight/head were resulted from the lowest plant density 23333 plants/fed. While, the highest averages of leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR), achenes yield/fed and oil, oleic and linoleic contents were recorded with a plant density of 35000 plants/fed. Otherwise, increasing plant density from 23333 to 46666 plant/fed caused a gradual increased in palmitic and stearic contents. Data also declared that the foliar spraying with boron significantly influenced all studied characters. The maximum averages of all studied characters were recorded from foliar spraying with 200 ppm of boron. Therefore, for maximizing the achenes yield oil content of sunflower plants it could be recommended to sowing at a plant density of 35000 plants/fed resulted from hill spacing 20 cm, also spraying plants with 200 ppm of boron under the ecological conditions of the experiment area.

Influence of Plant Densities Interacted with Boron Foliar spraying on sunflower productivity