Characterization of Rice Roots Using a Minirhizotron Technique

Beyrouty, C. A.; Wells, B. R.; Norman, Richard; Marvel, J. N.; Pillow, Jessica

doi:10.2134/asaspecpub50.c9

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…For EA soil, the maximum rooting depth was up to 45 cm, while for ASM and ESM soils rice roots increased in depth, reaching up to 60 cm. These results corroborate with Beyrouty et al (1987) findings for silt loam soils in Arkansas, who reported rice root growth up to 72 cm near harvesting. However, Yoshida (1981) stated that in an anaerobic environment, such as paddy soils with impaired water percolation, rice roots seldom exceed a maximum depth of about 40 cm, contrasting our results at ASM and ESM soils.…”

Section: Rice Root Morphologysupporting

confidence: 92%

“…The 15 N concentration in rice biomass and the higher NDFF observed with N application at greater depths are supported by the results from root growth and by previous study that estimate 86% of rice total root length in the top 36 cm of the soil profile when the rice crop is at the midtillering growth stage, growing rapidly, and actively taking up N and other nutrients (Beyrouty et al 1987). As rice plants were growing, roots reached deeper layer and absorbed N from greater depths, increasing the N content in rice leaves and aboveground biomass.…”

Section: Rice Photosynthetic and Nutritional Responsessupporting

confidence: 75%

“…The majority of flooded rice root length, root surface area, and root volume observed at the near surface layers is a feature of grasses and can also be ascribed to a higher nutrient (e.g., N, P, and K) availability, which favors root growth. Previous researches (Yoshida 1981;Beyrouty et al 1987) showed that rice roots tend to increase in depth throughout the growing season as the shoot part grows, with the maximum penetration depth occurring near harvest. For EA soil, the maximum rooting depth was up to 45 cm, while for ASM and ESM soils rice roots increased in depth, reaching up to 60 cm.…”

Section: Rice Root Morphologymentioning

confidence: 99%

See 2 more Smart Citations

Available Nitrogen in Paddy Soils Depth: Influence on Rice Root Morphology and Plant Nutrition

Drescher

Silva

Sarfaraz³

et al. 2020

J Soil Sci Plant Nutr

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Nitrogen (N) is a key nutrient for rice (Oryza sativa L.) and its availability in soil profile can influence the plant root morphology and total nutrient uptake. This study evaluated if N from deeper soil layers would increase rice root growth, N uptake and influence plant nutritional status. Flooded rice was grown in undisturbed soil samples from three locations with 15 N-labeled ammonium sulfate application at different depths (0, 10, 20, 30, and 45 cm). At rice heading, chlorophyll content and photosynthesis rate were measured at flag leaves and rice biomass production, root morphology, and total N and 15 N uptake were evaluated. Higher biomass and N uptake were observed with N application at near soil surface layers. The majority of rice N uptake was derived from soil, which was more evident when N fertilizer was injected at 45 cm deep (on average 74%). The highest root growth was observed at the near surface layers with constant decrease in depth, up to 60 cm. Roots from deeper layers exhibited smaller diameter, as they were mainly highly branched roots. The N application at 30 and 45 cm depths provided N later in the season, resulting in plants with lower total biomass but with higher N content in aboveground biomass, with higher chlorophyll content, photosynthesis rate, and carboxylation efficiency by Rubisco. The N available below 20 cm contributes to plant nutrition and root growth, hence soils with available N in depth likely cause plants to function more optimally in photosynthates supply.