Analysis of Long Term Study Indicates Both Agronomic Optimal Plant Density and Increase Maize Yield per Plant Contributed to Yield Gain.
Analysis of Long Term Study Indicates Both Agronomic Optimal Plant Density and Increase Maize Yield per Plant Contributed to Yield Gain.
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DOI：
10.1038/s41598-018-23362-x
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发表时间：
2018-03-21
影响因子：
4.6
通讯作者：
Ciampitti IA
中科院分区：
文献类型：
--
作者：
Assefa Y;Carter P;Hinds M;Bhalla G;Schon R;Jeschke M;Paszkiewicz S;Smith S;Ciampitti IA
与产量同步，玉米（Zea Mays L.）多年来植物密度显著增加。然而，与产量不同的是，种植密度的变化率及其对玉米产量增加的贡献很少报道。本研究的主要目的是研究农艺最佳种植密度（AOPD）的趋势，并量化种植密度对产量增加的贡献。从1987年到2016年，在北美进行了玉米杂交种播种率试验（187，662个数据点）。对元数据进行混合模型、响应面和简单线性回归分析。这一分析的新结果是：（i）AOPD以700株/公顷/年的速度增加，（ii）AOPD以1386、580和404株/公顷/年的速度增加，以获得极高产量（VHY，> 13 Mg ha−1），高产（HY，10-13 Mg ha−1）和中等产量（MY，7-10 Mg ha−1），分别与低产量缺乏变化（LY，< 7 Mg ha−1）环境;（iii）种植密度对玉米产量增加的贡献范围为8.5%至17%，和（iv）产量的提高部分由AOPD的变化解释，但我们也确定了对产量构成因素的积极影响作为产量增加的其他来源。
Concurrent to yield, maize (Zea Mays L.) plant density has significantly increased over the years. Unlike yield, however, the rate of change in plant density and its contribution to maize yield gain are rarely reported. The main objectives of this study were to examine the trend in the agronomic optimum plant density (AOPD) and quantify the contribution of plant density to yield gain. Maize hybrid by seeding rate trials were conducted from 1987–2016 across North America (187,662 data points). Mixed model, response surface, and simple linear regression analyses were applied on the meta-data. New outcomes from this analysis are: (i) an increase in the AOPD at rate of 700 plant ha−1 yr−1, (ii) increase in the AOPD of 1386, 580 and 404 plants ha−1 yr−1 for very high yielding (VHY, > 13 Mg ha−1), high yielding (HY, 10–13 Mg ha−1) and medium yielding (MY, 7–10 Mg ha−1), respectively, with a lack of change for the low yielding (LY, < 7 Mg ha−1) environment; (iii) plant density contribution to maize yield gain ranged from 8.5% to 17%, and (iv) yield improvement was partially explained by changes in the AOPD but we also identified positive impacts on yield components as other sources for yield gain.
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影响因子：
2.1
作者：
ALESSI, J;POWER, JF
通讯作者：
POWER, JF
影响因子：
2.1
作者：
Norwood, CA
通讯作者：
Norwood, CA
影响因子：
2.1
作者：
Ruffo, Matias L.;Gentry, Laura F.;Below, Frederick E.
通讯作者：
Below, Frederick E.
影响因子：
2.3
作者：
DUNCAN, WG
通讯作者：
DUNCAN, WG
影响因子：
2.3
作者：
Luetchens, Jon;Lorenz, Aaron J.
通讯作者：
Lorenz, Aaron J.