黄淮海区域30个夏玉米品种干物质积累和氮素转运特性
为探明黄淮海地区主推夏玉米品种的干物质积累和产量形成期氮素转运特性,本研究采用盆栽试验,依据单株产量、氮素吸收效率、氮素子粒生产效率和氮肥偏生产力对该区30个夏玉米品种进行聚类分析,将供试品种分为4种类型：高产氮高效型(Ⅰ)、高产氮中效型(Ⅱ)、中产氮中效型(Ⅲ)和低产氮低效型(Ⅳ)。经进一步相关分析和通径分析发现,单株产量、氮素吸收效率、氮素子粒生产效率和氮肥偏生产力间显著相关。开花期后,高产氮高效型(Ⅰ)夏玉米品种的氮素和干物质向子粒分配比例较高,氮转移量、转移效率、贡献率最高,低产氮低效型(Ⅳ)夏玉米品种向根、茎的分配比例较高,氮转移量、转移效率及贡献率最低。
英文摘要:
A pot experiment was conducted to evaluate the characteristics of dry matter (DM) production and Nitrogen transport characteristics in grain-filling period. in Huang-huai-hai region. According to the results, 30 summer maize hybrids can be divided into 4 types according to the yield per plant, nitrogen grain production efficiency (NGPE), nitrogen uptake efficiency (NAE) and partial factor productivity of applied nitrogen (PFPN), the type Ⅰ is high yield and high efficiency, the type Ⅱ is high yield and moderate efficiency, the type Ⅲ is moderate yield and moderate efficiency, the type Ⅳ is low yield and low efficiency. By the further correlation analysis and path analysis, significantly correlation between yield per plant, NGPE, NAE and PFPN. The NUE and DM are not different in silking stage, but are remarkably different in maturity stage, the type Ⅰ are the highest in the DM , nitrogen distributions to grain, nitrogen trans portation amount (NTA), nitrogen transportation efficiency (NTE) and nitrogen contribution rate (NCR) than other 3 types.The type Ⅳ are the highest in the DM and nitrogen distributions to roots and stalks. but the lowest in nitrogen transportation amount (NTA), nitrogen transportation efficiency (NTE) and nitrogen contribution rate (NCR) than other 3 types.
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