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Corn response to row spacing and plant population in the Mid-South United States
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-07-22 , DOI: 10.1002/agj2.20817
Joey Williams 1 , Darrin M. Dodds 1 , Normie W. Buehring 2 , Jagmandeep Dhillon 1 , Brien Henry 1
Affiliation  

Mid-South corn (Zea mays L.) producers continuously search for ways to increase grain yield. In this region, growers typically plant on 96-cm beds to facilitate drainage of excess rainfall and irrigation but are concerned about wide row spacing causing intra-row stress as plant populations steadily increase. The objective of this research was to determine the effect of row spacing and plant population on morphology and grain yield. The experiment assessed two row spacing (48 and 96 cm) and subplots that contained five plant populations (61,775, 86,485, 111,195, 135,905, and 160,615 plants ha–1). This study took place across six site-years; in 2017, Starkville and Verona, MS, 2018, two in Starkville, MS, and in 2019, Starkville and Tchula, MS. Pooled over site-years and plant populations, narrow rows increased grain yield by 5% (p < .01), stalk diameter by 4% (p < .01), and kernels per row by 6% (p < .01), compared to wide rows. Pooled over site-years and row spacing, plant height, soil plant analysis development (SPAD) value, stalk diameter, kernel rows, kernels per row, and hundred-kernel weight decreased as plant population increased except for ear height and leaf area index (LAI), which increased. Agronomic optimum plant populations ranged from 104 to 119 thousand ha–1 and were dependent upon site-year. In conclusion, decreases in inter-row spacing and increases in intra-row spacing increased grain yield.

中文翻译:

美国中南部玉米对行距和植物种群的反应

中南玉米 ( Zea mays L.) 生产者不断寻找提高谷物产量的方法。在该地区,种植者通常在 96 厘米的床上种植,以促进多余降雨和灌溉的排水,但担心随着植物种群的稳步增加,宽行距会导致行内压力。本研究的目的是确定行距和植物种群对形态和谷物产量的影响。该实验评估了两个行距(48 和 96 厘米)和包含五个植物种群(61,775、86,485、111,195、135,905 和 160,615 株植物 ha –1)。这项研究跨越六个站点年进行;2017 年,斯塔克维尔和维罗纳,MS,2018 年,两个在斯塔克维尔,MS,2019 年,斯塔克维尔和 Tchula,MS。汇集不同的地点年份和植物种群,窄行使谷物产量增加 5% ( p  < .01),茎直径增加 4% ( p  < .01),每行籽粒增加 6% ( p  < .01),与宽行相比。汇集了立地年和行距、植物高度、土壤植物分析发展 (SPAD) 值、茎直径、籽粒行、每行籽粒和百粒重随着植物种群的增加而减少,但穗高和叶面积指数除外( LAI),增加。农艺最适植物种群范围为 104 至 11.9 万公顷–1并且取决于站点年份。总之,行间距的减小和行间距的增加增加了谷物产量。
更新日期:2021-07-22
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