Effects of Ecotypes and Reduced N Fertilization on Root Growth and Aboveground Development of Ratooning Sorghum × Sudangrass Hybrids

Author:

Choi Nayoung1,Choi Miri2,Lee Sora2,Jo Chaelin2,Kim Gamgon3,Jeong Yonghyun4,Lee Jihyeon5,Na Chaein26ORCID

Affiliation:

1. Future Agriculture Center, Kyung Nong Corporation, Gimje 54338, Republic of Korea

2. Division of Applied Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea

3. Future Technology Research Center, KT&G, Daejeon 34128, Republic of Korea

4. Department of Seed Service, Korea Agriculture Technology Promotion Agency, Iksan 54667, Republic of Korea

5. Crop Production and Physiology Division, National Institute of Crop Science, Rural Development Administration, Wanju 55365, Republic of Korea

6. Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea

Abstract

Reduced N input while maintaining biomass production of sorghum × sudangrass hybrids (Sorghum bicolor L. × Sorghum sudanense; SSG) is essential; however, its effects on root sustainability and photosynthetic capacity during the ratooning period are not well defined in a multiple harvests system. The physiological response and root morphology of SSG were investigated under different N application levels during the ratooning period in a two-year field experiment. Treatments were all combinations of two ecotypes (late-flowering, Greenstar; early-flowering, Honeychew) and four N levels (0, 50, 100, 150 kg N ha−1). The total root length, surface area, volume, tips, and dry matter (DM) were significantly influenced by both ecotype and N level, with Greenstar outperforming Honeychew. Specifically, Greenstar’s root length increased by up to three times with reduced N application (50 kg N ha−1), while Honeychew showed significant root length increases only at higher N levels (100 and 150 kg N ha−1). Our data support the conclusion that a low level of N (50–100 kg N ha−1) was the optimal rate for ratooning root sustainability. The findings highlight the critical role of root development in sustaining biomass production and suggest that the late-flowering ecotype, Greenstar, is more suitable for a multiple harvests system with a robust root system.

Funder

National Research Foundation of Korea

Publisher

MDPI AG

Reference40 articles.

1. Sweet sorghum-a potential alternate raw material for bio-ethanol and bio-energy;Reddy;Int. Sorghum Millets Newsl.,2005

2. Optimizing sweet sorghum production for biofuel in the southeastern USA through nitrogen fertilization and top removal;Erickson;Bioenergy Res.,2012

3. Barnes, R.F., Miller, D.A., and Nelson, C.J. (1995). Forages, Iowa State University Press. [5th ed.].

4. Planting date affects rainfed sorghum forage yields in semiarid, subtropical environments;Lauriault;Forage Grazinglands,2012

5. Forage and biomass feedstock production from hybrid forage sorghum and sorghum–sudangrass hybrids;Venuto;Grassland Sci.,2008

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3