作物学报Issue(10)：1830-1838,9.DOI:10.3724/SP.J.1006.2014.01830
不同株高夏玉米品种的氮素吸收与利用特性
Nitrogen Uptake and Utilization of Summer Maize Hybrids with Different Plant Heights
摘要
Abstract
In order to explore nitrogen absorption and utilization characteristics of summer maize hybrids with different plant heights, high-stalk hybrid (Ludan 981, LD981), medium-stalk hybrid (Zhengdan 958, ZD958) and short-stalk hybrid (Denghai 661, DH661) were used in field experiment and and pool cultivation experiment 15N isotopic dilutions. Results showed that the grain yield and partial factor productivity of fertilizer N (NPFP) at the planting density of 82 500 plants ha-1 increased signifi-cantly compared with those at 67 500 plants ha-1. The amounts of nitrogen derived from fertilizer N ranged from 69.3%to 77.3%, N harvest indices of soil and fertilizer N were 54.6%and 57.4%, respectively. The proportion of N accumulation from fertilizer of short-stalk hybrid at 82 500 plants ha-1 decreased significantly compared with those at 67 500 plants ha-1, while the proportion of medium-stalk and high-stalk hybrids was not changed significantly. The fertilizer N harvest index of medium and high-stalk hy-brids decreased significantly, while that of short-stalk hybrid increased significantly. 15N applied in 5 cm soil made the least con-tribution to the fertilizer nitrogen accumulation of whole plant, 15N application in 40 cm soil made the greatest contribution to the fertilizer nitrogen accumulation of whole plant. With the increase of plant height, the contribution of 15N in 40 cm soil to the fer-tilizer nitrogen accumulation gradually decreased. The N recovery rate (NRR) of high-stalk and medium-stalk hybrids at 40 cm soil layer was higher than that of 5 cm and 20 cm. Contrarily, NRR of short-stalk hybrid at 20 cm higher than those at 40 cm and 5 cm. Therefore, more N uptake of the short-stalk hybrid was from 20-40 cm soil layer, however, more N uptake of high-stalk and medium-stalk hybrids was from 40-60 cm soil layer.关键词
株高/夏玉米/土层深度/氮素回收率/15N同位素示踪Key words
Plant height/Summer maize/Soil depth/N recovery rate/15N isotope引用本文复制引用
范霞,张吉旺,任佰朝,李霞,赵斌,刘鹏,董树亭..不同株高夏玉米品种的氮素吸收与利用特性[J].作物学报,2014,(10):1830-1838,9.基金项目
本研究由国家自然科学基金项目(31271662),山东省现代农业产业技术体系建设专项(SDAIT-01-022-05)和国家公益性行业(农业)科研专项(201203100)资助。 （31271662）
