宁夏大学学报（自然科学版）2017，Vol.38Issue(4)：383-387,5.
宁夏中部干旱带不同施氮量对油用向日葵氮肥利用率与经济效益的影响
Nitrogen Application Rate's Affect on Oil-used Sunflower Nitrogen Use Efficiency and Economic Benefits in Central Arid Area of Ningxia
摘要
Abstract
The article studies nitrogen absorption and utilization,crop yield and economic effectiveness of different organs in primary growth stage of oil sunflower by setting different field experiments of different nitrogen application rates.The result shows that,comparing with non-fertilization,increasing of nitrogen application facilitates the nutrient absorption of oil sunflowers' overground part,and the nitrogen in overground part turns from increasing to decrease as the increasing of nitrogen application rate.As the addition of nitrogen application rate,the nitrogen use efficiency tends to decrease,which means,the nitrogen use efficiency of N1 P2K2 process reaches the highest,to 16％;Nitrogen partial factor productivity tends to decrease,and there is significant difference between N3 P2 K2 process and N1P2 K2,N2 P2 K2 process;as the increasing of nitrogen application rate,nitrogen agronomic efficiency decreases,and there is difference between either process non-significantly;physiological efficiency of nitrogenous fertilizer decreases as the increase of nitrogen application,and between either process there is difference less obviously.The addition of application levels of nitrogen fertilizer can enhance the height and thickness of oil sunflower.Rational nitrogen application will promote input-output ratio,of which,net income reaches highest when pure nitrogen application reaches 270 kg/hm2.After overall consideration on the factors of crop yield,nitrogen use efficiency,and economic effectiveness,the article recommends that the suitable pure nitrogen application of oil sunflower in central arid area of Ningxia will be 270 kg/hm2.关键词
油葵/施肥量/氮肥利用率/产量/经济效益Key words
oilseed sunflower/fertilization application rate/Nitrogen use efficiency/yield/economic benefit分类
农业科技引用本文复制引用
徐苗,何文寿,侯贤清..宁夏中部干旱带不同施氮量对油用向日葵氮肥利用率与经济效益的影响[J].宁夏大学学报（自然科学版）,2017,38(4):383-387,5.基金项目
公益性行业(农业)科研专项基金资助项目(201503120) （农业）
