摘要
为探明滴灌冬小麦高产需氮肥规律,利用大田试验研究了N_0(0 kg·hm^(-2))、N_1(90kg·h^(-2))、N_2(180kg·h^(-2))、N_3(270kg·h^(-2))、N_4(360kg·h^(-2))施氮量对新冬18号0~60cm土层根系生长的影响及其与产量和氮肥利用率的关系。结果表明,随着施氮量的增加,拔节至成熟期间0~60cm土层根系干重、根长和根系活力均增加,N_3处理孕穗期小麦0~60cm土层根干重、根长分别较N_0处理增加11.93%、29.0%,增幅基本表现为0~20cm>20~40cm>40~60cm土层;N_3处理较N_0处理小麦产量增加30.35%,氮肥农学利用效率为6.90kg·kg-1。拔节期前后施适量氮肥可促进0~60cm土层根系生长和活力增强,是氮肥增产的重要原因。本试验条件下最适宜施氮量为180~270kg·h^(-2),可获得产量7 591.49~8 004.85kg·h^(-2),氮肥农学利用效率为6.90~8.06。
To verify the effects of nitrogen application on the growth of root and yield of winter wheat under drip irrigation, five different nitrogen application treatments: No (0 ·hm^-2)), N1 (90 kg·hm^-2)),N2 (180 kg·hm^-2)),N3 (270 kg ·hm^-2),and N4 (360 kg ·hm^-2)) were conducted. In the field experiments,effects of different nitrogen application treatments on root growth in 0-60 cm soil layers and the relationship between the yield and nitrogen use efficiency were studied. The results showed that:with the increase of nitrogen application, the dry weight,length and vitality of root in 0- 60 cm layers was increased from jointing to maturity stages; the dry weight and length of root in 0- 60 cm layers at booting stage under N3 treatment were increased by 11.93% and 29.0% ,respectively, compared to those under No treatment,with an increase amplitude ranged as 0-20 cm 〉 20-40 cm 40-60 cm soil layers; the yield under N3 treatment was increased by 30.35% and the AEN was 6.90 kg ·kg^-1. The appropriate amount of nitrogen fertilizer application promoted root growth and strong vitality in 0-60 cm layers before and after jointing stage,and it was an important factor for production increase. In this experiment, the optimum amount of nitrogen was 180-270 kg·hm^-2, and the yield was 7 591.49-8 004.85 kg ·hm^-2,with the AEN of 6.90-8.06.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2016年第6期773-778,共6页
Journal of Triticeae Crops
基金
新疆农业科学院青年基金项目(xjnkq-2015045)
关键词
冬小麦
滴灌
氮肥
根系
产量
Winter wheat
Drip irrigation
Nitrogen
Root
Yield