Root Formation in Rice Plant and Levels of Nitrogen Supply

Kawata, Shin-ichiro; Maruyama, Sachio; Soejima, Masuo

doi:10.1626/jcs.46.193

Cited by 14 publications

(8 citation statements)

References 2 publications

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“…The larger increase in root length with PCU than with split urea was due to larger aboveground biomass and/or stimulation of root growth. In rice grown under submerged soil conditions where NH 4 was the dominant inorganic N source, the root distribution became shallower with a high dose of N, probably due to the inhibition of elongation of the nodal root by NH 4 (Kawata et al, 1977). Such enhancements of root development and water capture from deep soil layers by N application were reported in other crops such as winter wheat (Triticum aestivum L.) (Brown, 1971;Kmoch et al, 1957), and maize (Zea mays L.) (Linscott et al, 1962).…”

Section: Root Developmentmentioning

confidence: 71%

Yield Response to Urea and Controlled-Release Urea as Affected by Water Supply in Tropical Upland Rice

Kondo

Singh²,

Agbisit

et al. 2005

Journal of Plant Nutrition

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Nitrogen (N) deficiency and water stress are major abiotic constraints upon the production of upland rice (Oryza sativa L.) in tropical Asia. It is, therefore, imperative to quantify the effect of N input on yield and to identify factors affecting the variability of yield response to N under various water supply conditions in order to develop efficient methods of N and crop management. Field experiments were conducted in Bihar, India, over four years to analyze the effect of N rate with split application of soluble urea, and a N sources, split application of soluble urea, and a single application of polyolefin resin-coated controlled-release urea (PCU) on the grain yield, apparent N recovery fraction (ANR), economic N use efficiency (grain yield per N uptake or GYNUE), and root growth. The yield responded linearly to increasing N rate in split urea, but along a different slope in each year. The yield response to N rate was variable among years due to variations in ANR and GYNUE. A significant relationship between the ANR and yield gain by N application across years indicated the importance of improving ANR to maximize the cost-benefit ratio. A comparison of split urea and PCU indicated that ANR could be improved more by the application of PCU than by split urea, especially under a high water supply from rainfall or irrigation. This is probably due to less N having been lost due to runoff and leaching when PCU was used. GYNUE was relatively stable across N treatments, but showed significant year-to-year variation, caused by variations in both the biomass N use efficiency (BNUE) (aboveground dry weight per N uptake) and harvest index (HI) as affected by rainfall conditions. The application of N increased root length from the surface to a below-45 cm depth, which may have contributed to the water exploitation under water stress.

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Section: Root Developmentmentioning

confidence: 71%

Yield Response to Urea and Controlled-Release Urea as Affected by Water Supply in Tropical Upland Rice

Kondo

Singh²,

Agbisit

et al. 2005

Journal of Plant Nutrition

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“…This result differed from observations made in submerged soil where heavy N application led to shallower roots with shorter nodal root axes. (Kawata et al 1977). Inhibition of root elongation by N in submerged soil is probably related to metabolic disturbance by NH4 +.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of root growth and water uptake from soil in upland rice and maize under water stress

Kondo

Murty

Aragones

2000

Soil Science and Plant Nutrition

105

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“…Also, our previous study on the effects of low nitrogen content on seminal root length indicated the presence of natural variation among wheat genotypes (Górny et al., ; Grzesiak et al., ). The studies on relationships between root systems and nitrate uptake suggested that increasing root densities deep in the soil profile would reduce nitrate‐leaching loss (Batey, ; Crush et al., ; Kawata, Marujama, & Soejiama, ; Masle, ). Genotypic variation in root soil distribution and nitrate interception was found in perennial ryegrass parents and their progeny, but the extent of genetic variation in root traits was unknown and the progress in breeding for vertical root distribution would be slow (Crush et al., ; Uga et al., ).…”

Section: Discussionmentioning

confidence: 99%

Influence of nitrogen deficiency or excess on a root system structure of maize and triticale seedlings grown under low and high soil density

Grzesiak

Hura

Grzesiak

et al. 2017

J Agronomy Crop Science

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Responses of maize and triticale seedlings, differing in the susceptibility to soil density stress, and grown under low (LD) or high (HD) soil density and poor (PN), high (HN) or control (CN) nitrogen content in soil were investigated in relation to changes in physiological parameters—dry matter of shoot (S), root (R), shoot to root ratio (S/R), relative growth ratio of shoot and root (RGR), chlorophyll content (SPAD), total roots number and length (TRN, TRL), root penetration ability (RPA) and ratio of deep rooting (RDR). The seedlings grown under high soil density (HD) and control N‐soil content (CN) in comparison with LD and CN treatments showed a decrease in all measured parameters. Under poor and high nitrogen content, changes in the traits were higher for triticale than for maize. Higher differences between resistant and sensitive genotypes in TRN, TRL, RPA and RDR were observed particularly in the seedlings grown under HD treatment. Differences in parameters values between seedlings grown under control and nitrogen‐rich soil may be considered as a positive interaction between stresses. Our results suggest that the type of root structure (scattered, dimorphic) would be helpful in enhancing modelling and agronomic management for improved of plant stress tolerance.

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Root Formation in Rice Plant and Levels of Nitrogen Supply

Cited by 14 publications

References 2 publications

Yield Response to Urea and Controlled-Release Urea as Affected by Water Supply in Tropical Upland Rice

Yield Response to Urea and Controlled-Release Urea as Affected by Water Supply in Tropical Upland Rice

Characteristics of root growth and water uptake from soil in upland rice and maize under water stress

Influence of nitrogen deficiency or excess on a root system structure of maize and triticale seedlings grown under low and high soil density

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