黄土高原半干旱地区春小麦施氮效应研究  

The effects of nitrogen rates of spring wheat in the semi-arid region of the Loess Plateau

作　　者：郭清毅[1] 黄高宝[2] 逄蕾[2] 李玲玲[2] 

机构地区：[1]甘肃省农业科学院旱地农业研究所,甘肃兰州730070 [2]甘肃农业大学农学院,甘肃兰州730070

出　　处：《甘肃农业大学学报》2004年第6期629-633,共5页Journal of Gansu Agricultural University

基　　金：甘肃农业大学与澳大利亚合作ACIAR项目

摘　　要：于2003年在甘肃定西对旱地春小麦施氮效应与效益进行了初步研究。研究结果表明,在高降水变率的干旱年份,春小麦产量水平较低,施氮肥能增加产量以及穗粒数和千粒重,而且水分效率明显提高,各肥料处理之间产量和水分效率的变异系数达到10.1%和9.8%。其中以N105处理的产量及水分效率最高,分别为1.41t/hm2和5.17kg/mm。从经济施肥角度考虑,定西地区获得最佳经济产量氮的施用量为52.5kg/hm2。由于生育关键期的水分亏缺,各肥料处理之间的干物质无显著差异。The field experiment of nitrogen rates was conducted to investigate the effects on grain yield and water use efficiency for spring wheat in the semi-arid area of Dingxi, Gansu Province, in 2003. The results showed that grain yield was low in the year of high rainfall variation. Nitrogen application increased in grain yield, kernel number, one-hundred seed weight, and water efficiency. Variation coefficient of the grain yield and water use efficiency was 10.1 percent and 9.8 percent in the every treatment, respectively. Compared with others treatments, N105 treatment had the highest grain yield (1.41 t/hm2) and water use efficiency (5.17 kg/mm), respectively. Concerning on the optimum economic efficiency, the optimum commercial efficiency application rates of nitrogen fertilizer was 52.5 kg/hm2in Dingxi area. However, no statistical significances were found in dry weight among nitrogen treatment due to serious water stress at the stage of crop critical growth.

关 键 词：春小麦 干旱 氮肥 产量 水分效率 

分 类 号：S512.12[农业科学—作物学]