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Effects of Sea Water at Different Concentrations on the Photosynthesis and Chlorophyll-Fluorescence Properties of Oil Sunflower Seedlings Moisture effect analysis of pumpkin and oil sunflower intercropping in semi-arid area of northwest Hebei Province Effect of Water-nitrogen Coupling on Photosynthesis and Soil Water Use of Oil Sunflower in Drip-irrigated Multiple Cropping System Effect of Drip Irrigation on Water Consumption and Growth of Oil Sunflower in Northern Xinjiang Genetic Effects and Correlation Analysis for Agronomic Traits in Oil Sunflower  Effects of N, P and K Fertilizers on yield and fertilizer efficiency of oil sunflower