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Corn seedling root growth response to soil physical quality
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-05-03 , DOI: 10.1002/agj2.20705
Márcio R. Nunes 1 , Renato P. de Lima 2 , Cassio A. Tormena 3 , Douglas L. Karlen 4
Affiliation  

Plant available water content or matric potential, particle size (texture), aeration, and penetration resistance are soil physical properties that influence soil structure, bulk density, aggregation, and several metabolic plant processes. Collectively they influence productivity and sustainability of agricultural practices, primarily through their impact on root development and growth. To simplify use of these parameters for assessing soil physical condition, the least limiting water range (LLWR) was developed as an integrated, comprehensive soil physical quality indicator. Our objective was to use the LLWR to evaluate corn (Zea mays L.) seedling root growth in soils with clay, sandy clay loam, or sand texture. Overall, root growth was affected by soil water content, aeration, and penetration resistance. Upper and lower LLWR boundaries were defined by a minimum air-filled porosity and maximum soil penetration resistance for water contents between field capacity and permanent wilting point. Herein, the LLWR was calculated using a range of minimum air-filled porosity (0.117–0.146 m3 m−3), field capacity (–2.2 to –5.3 kPa), and permanent wilting point or matric potential values (–461 to –6,516 kPa), and a restrictive penetration resistance value of 1.6 MPa as boundaries. The LLWR was sensitive to soil texture, decreasing from fine to coarse soils. The highest and lowest relative root growth measurements fell inside and outside the LLWR boundaries, proving that this index can successfully predict the optimum soil physical conditions for seedlings root growth and can therefore be used as a sensitive soil physical quality.

中文翻译:

玉米幼苗根系生长对土壤物理质量的响应

植物有效水含量或基质势、粒径(质地)、通气性和抗渗透性是影响土壤结构、容重、聚集和几种植物代谢过程的土壤物理特性。它们共同影响农业实践的生产力和可持续性,主要是通过它们对根系发育和生长的影响。为了简化评估土壤物理条件的这些参数的使用,最小极限水范围 (LLWR) 被开发为一个综合的、综合的土壤物理质量指标。我们的目标是使用 LLWR 来评估玉米(Zea maysL.) 幼苗根系在粘土、砂质粘壤土或沙质土壤中生长。总体而言,根系生长受土壤含水量、通气性和渗透阻力的影响。上下 LLWR 边界由最小充气孔隙率和最大土壤渗透阻力定义为田间持水量和永久枯萎点之间的含水量。在此,LLWR 是使用最小充气孔隙率范围 (0.117–0.146 m 3  m -3)、场容量(–2.2 至 –5.3 kPa)和永久萎蔫点或基质电位值(–461 至 –6,516 kPa),以及 1.6 MPa 的限制穿透阻力值作为边界。LLWR 对土壤质地敏感,从细土到粗土递减。最高和最低的相对根系生长测量值落在 LLWR 边界内外,证明该指数可以成功预测幼苗根系生长的最佳土壤物理条件,因此可以用作敏感的土壤物理质量。
更新日期:2021-05-03
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