Nitrogen Use Efficiency and Nitrogen Uptake of <i>juncea</i> Canola under Diverse Environments

Gan, Yantai; Malhi, S. S.; Brandt, S.A.; Katepa‐Mupondwa, F.; Stevenson, Craig

doi:10.2134/agronj2007.0229

Cited by 30 publications

(42 citation statements)

References 20 publications

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“…Therefore, similar to grain yield, to obtain maximum value of oil and protein yields, irrigation of canola plants with 450 mm ha −1 total water at the duration of growing season and fertilization with 120 kg N ha −1 could be beneficial. These results are in agreement with previous reports (Leilah and Al‐Khateeb, 2003; Al‐Barrak, 2006; Gan et al, 2008).…”

Section: Resultssupporting

confidence: 94%

“…A direct relationship between N uptake and percent seed protein is reported because of the finding that higher seed protein was correlated with higher N concentration in all vegetative parts of the plants (Zlatko and Zdenko, 2006). Nitrogen concentration in High‐N was consistently higher than in Low‐N, which is in accordance with the results presented here (Zlatko and Zdenko, 2006; Gan et al, 2008). These results indicated that only N rates had significant effect ( p < 0.01) on straw N concentration (Table 2), with averages 2.88 and 6.27 g kg −1 for NR 1 (control) and NR 5 (160 kg N ha −1 ) treatments, respectively.…”

Section: Resultssupporting

confidence: 92%

“…The WUE (kg mm −1 water) was calculated for seed, oil, and protein yields. The data were used to calculate seed and straw N concentrations, N uptake (dry weight × N concentration) for seed, straw, and total N uptake, NUE [seed yield/(N uptake treated + N uptake in control)] (Gan et al, 2008) and N‐harvest index [(seed N/shoot N uptake) × 100](Zlatko and Zdenko, 2006). Agronomic nitrogen efficiency (ANE) was calculated as the ration of (Grain yield F – Grain yield control) to N applied, where F equals fertilizer treatments (El‐Gizawy, 2009).…”

Section: Methodsmentioning

confidence: 99%

“…Agronomic nitrogen efficiency (ANE) was calculated as the ration of (Grain yield F – Grain yield control) to N applied, where F equals fertilizer treatments (El‐Gizawy, 2009). Nitrogen fertilizer use efficiency (NFUE) was defined as seed yield produced per unit of N fertilizer, [(seed yield with applied fertilizer N) – (seed yield in zero‐N, control)]/Nf, where Nf equals amount of N from fertilizer (Gan et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

“…For canola species, under environments with low yield potential, the N fertilizer required for maximum seed yield was around 120 kg N ha −1 . As moving to environments with high yield potential from the low, the optimum N fertilizer requirement stayed the same for canola hybrids (Gan et al, 2008). Nitrogen use efficiency is commonly defined as seed yield produced per unit of N supplied (Moll et al, 1982).…”

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confidence: 99%

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Seed, Oil, and Protein Yields of Canola under Combinations of Irrigation and Nitrogen Application

Hamzei

2011

Agronomy Journal

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Canola (Brassica napus L.), an important oilseed crop in Iran, is intensively managed with high inputs of N and irrigation water. Understanding N and water use characteristics of canola will help improve N and water use effi ciency (WUE) and reduce production costs. Here, the eff ects of irrigation levels (IL 1 , 750; IL 2 , 450; and IL 3 , 300 mm water ha -1 ) and N rates (NR 1 , 0; NR 2 , 40; NR 3 , 80; NR 4 , 120; and NR 5 , 160 kg N ha -1 ) on canola production are evaluated during 2006 and 2007 growing seasons. Data showed that irrigation levels and N rates and their interaction had signifi cant eff ects on WUE for seed, oil, and protein as well as seed, oil, and protein yields/ha. Th e maximum values of seed, oil, and protein yields ha -1 , WUE for these traits and seed weight plant -1 were achieved at IL 2 × NR 4 treatment. Th e highest values of seed N concentration and seed N uptake were produced at IL 2 treatment. Among N rates, maximum averages of seed and straw N concentration were observed at 160 kg N/ha. Th e highest signifi cant value of straw N uptake was observed at IL 1 treatment. Also, maximum N uptake for both seed and straw was the same at 120 and 160 kg N ha -1 . Total N uptake achieved signifi cantly in IL 2 × NR 4 treatment. With decreasing irrigation water and increasing N rates, N use effi ciency decreased signifi cantly. In general, consumption of 450 mm water ha -1 season -1 and supplying 120 kg N ha -1 can produce the highest seed, oil, and protein yields ha -1 , while increasing WUE and decreasing N leaching.

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Section: Resultssupporting

confidence: 94%

Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Seed, Oil, and Protein Yields of Canola under Combinations of Irrigation and Nitrogen Application

Hamzei

2011

Agronomy Journal

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Developing functional relationships between sesame growth, development, and nitrogen nutrition during early season

Sehgal

Smith

Walne

et al. 2021

Agrosystems Geosci & Env

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Plants, being sessile, are subjected to multiple environmental stresses of varying intensity throughout their life cycle. Among the stresses, low fertility, drought, salinity, and nonoptimal temperatures limit crop productivity worldwide. Functional relationships between leaf N and crop growth are prerequisites to developing management tools that optimize productivity in the field. An outdoor pot-culture experiment was conducted to determine the relationship between leaf N and sesame (Sesamum indicum L.) growth and development. Plants were grown in pots filled with fine sand and irrigated with full-strength Hoagland's nutrient solution until 10 d after sowing (DAS). Five N treatments were then imposed: one treatment of full-strength Hoagland's nutrient solution (control, 100% N), and four reformulations of Hoagland's nutrient solution containing reduced N at 60, 20, 10, and 0% of the control. Treatments were maintained until plants were harvested at 31 DAS. Growth, including several root traits, photosynthesis, and leaf N were measured at the end of the experiment. Maximum values were achieved at 5.3% leaf N in the leaves except for transpiration rate, stomatal conductance, and root/shoot ratio. Even though all growth rates declined with lower leaf N, the leaf area expansion among shoot and root volume among the root growth traits were most sensitive to leaf N. Among the root developmental traits, number of root tips was more sensitive to leaf N than other parameters. Among the plant dry components, leaf dry weight had the most considerable decrease. The root/shoot ratio increased under N deficiency. These N stress response indices and critical leaf N levels for various growth processes will help model and manage sesame crops in the field.

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Carinata growth, yield, and chemical composition responses to nitrogen fertilizer management

et al. 2020

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Production of carinata (Brassica carinata A. Braun) as a winter crop in the Southeast United States presents a unique opportunity for growers to produce significant amounts of biofuel feedstock to meet domestic energy needs. Field experiments were conducted to quantify the effects of N application rates (0, 45, 90, and 135 kg N ha −1) and split management (single, two-way split, or three-way split of 90 kg N ha −1 applied at planting, bolting, and flowering) on carinata growth, yield, and chemical composition. In Study 1, plant height, mainstem node numbers, primary and secondary branches, pod length, pods numbers, and seeds per pod increased quadratically with N application rate. Averaged over the 5 yr, seed yield response to N application rate was quadratic and ranged from 1,245 kg ha −1 with 0 kg N ha −1 to 2,444 kg ha −1 with 117 kg N ha −1. The economic optimum nitrogen rate (EONR) occurred at 103 kg N ha-1 , which produced 2,427 kg seed ha −1 representing a US$386 ha −1 profit margin. Except for protein, N application rate did not have an effect on glucosinolates and fatty acid composition. In Study 2, a split application of N had variable effects on carinata growth; however, seed yield did not vary with split management or timing of N averaging 3,905 kg ha −1. Split management and N source did not have an effect on seed chemical composition. These results suggest that carinata grown at the EONR of 103 kg N ha −1 can maximize seed and oil production in the Southeast.

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Nitrogen Use Efficiency and Nitrogen Uptake of juncea Canola under Diverse Environments

Cited by 30 publications

References 20 publications

Seed, Oil, and Protein Yields of Canola under Combinations of Irrigation and Nitrogen Application

Seed, Oil, and Protein Yields of Canola under Combinations of Irrigation and Nitrogen Application

Developing functional relationships between sesame growth, development, and nitrogen nutrition during early season

Carinata growth, yield, and chemical composition responses to nitrogen fertilizer management

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