Study on Water Demand and Coupling Effect of Water and Nitrogen on Sunflower in the North of Yinshan Mountain

Abstract

【Objective】 To clarify the water requirement law of sunflower and improve the coupling effect of water and nitrogen. 【Method】 A plot experiment was conducted to set three irrigation amounts, namely, rain-fed W0, supplementary W1 67.5 mm and conventional irrigation W2 135 mm, and three nitrogen application levels, namely, N0 (no nitrogen application), recommended nitrogen N1 135 kg/hm2 and excess nitrogen N2 270 kg/hm2, respectively. The effects of water and nitrogen coupling on yield, water consumption, water use efficiency, fertilizer utilization rate and water and nitrogen coupling effect of sunflower were studied. 【Result】 A plot experiment was conducted to set three irrigation amounts, namely, rain-fed W0, supplementary W1 67.5 mm and conventional irrigation W2 135 mm, and three nitrogen application levels, namely, N0 (no nitrogen application), recommended nitrogen N1 135 kg/hm2 and excess nitrogen N2 270 kg/hm2, respectively. The effects of water and nitrogen coupling on yield, water consumption, water use efficiency, fertilizer utilization rate and water and nitrogen coupling effect of sunflower were studied. 【Conclusion】 The suitable fertilization and irrigation mode for Sunflowers at the North Foot of Yinshan Mountain is the supplementary irrigation amount of 159.2~177.1 mm and the nitrogen rates of 166~218.3 kg/hm2. The 12-leaf - opening stage is the key period of water and fertilizer demand, and the supply of water and fertilizer should be ensured.

Keywords

• sunflower
• water-nitrogen coupling
• yield
• water consumption
• wue
• nue