Cultivar and N Fertilizer Rate Affect Yield and N use Efficiency in Irrigated Durum Wheat

Crop Science ◽  
2014 ◽  
Vol 54 (3) ◽  
pp. 1175-1183 ◽  
Author(s):  
Zhejun Liang ◽  
Kevin F. Bronson ◽  
Kelly R. Thorp ◽  
Jarai Mon ◽  
Mohammad Badaruddin ◽  
...  
Keyword(s):  
Durum Wheat ◽  
N Fertilizer ◽  
N Use Efficiency ◽  
Fertilizer Rate ◽  
Use Efficiency ◽  
N Use ◽  
N Fertilizer Rate

Effects of nitrogen fertilizer application on seed yield, N uptake, N use efficiency, and seed quality of Brassica carinata

2013 ◽  
Vol 93 (6) ◽  
pp. 1073-1081 ◽  
Author(s):  
E. N. Johnson ◽  
S. S. Malhi ◽  
L. M. Hall ◽  
S. Phelps
Keyword(s):  
Seed Yield ◽  
Seed Quality ◽  
N Uptake ◽  
Fertilizer Application ◽  
Brassica Carinata ◽  
N Fertilizer ◽  
N Use Efficiency ◽  
Use Efficiency ◽  
N Rates ◽  
N Use

Johnson, E. N., Malhi, S. S., Hall, L. M. and Phelps, S. 2013. Effects of nitrogen fertilizer application on seed yield, N uptake, N use efficiency, and seed quality of Brassica carinata . Can. J. Plant Sci. 93: 1073–1081. Ethiopian mustard (Brassica carinata A. Braun) is a relatively new crop in western Canada and research information on its response to N fertilizer is lacking. Two field experiments (exp. 1 at 3 site-years and exp. 2 at 4 site-years) were conducted from 2008 to 2010 in Saskatchewan and Alberta, Canada, to determine effect of N fertilizer application on Brassica carinata plant density, seed and straw yield, N uptake in seed and straw, N use efficiency (NUE), N fertilizer use efficiency (NFUE) and seed quality. N rates applied were 0 to 160 kg N ha−1 and 0 to 200 kg N ha−1 in exps. 1 and 2, respectively. Plant density was not affected by increasing N rate at 5 site-years but declined with high rates of N application at 2 site-years. Seed yield responded to applied N in 6 of 7 site-years, with the non-responsive site having a high total N uptake at the 0 kg N ha−1 rate (high Nt value). There were no sites where seed yields were maximized with the N rates applied. Response trends of straw yield and N uptake were similar to that of seed yield at the corresponding site-years. NUE and NFUE generally declined as N rate increased. Protein concentration in seed generally increased and oil concentration in seed decreased with increasing N rates. In conclusion, the responses of seed yield, total N uptake, NUE, and NFUE to applied N was similar to those reported in other Brassica species with the exception that a rate was not identified in which Brassica carinata yields were maximized.

scholarly journals Effects of PU, USG and NPK briquette on nitrogen use efficiency and yield of BR22 rice under reduced water condition

2014 ◽  
Vol 11 (2) ◽  
pp. 215-220
Author(s):  
A Naznin ◽  
H Afroz ◽  
TS Hoque ◽  
MH Mian
Keyword(s):  
Block Design ◽  
N Fertilizer ◽  
N Use Efficiency ◽  
Water Yield ◽  
Deep Placement ◽  
Science Field ◽  
Randomized Complete Block Design ◽  
Use Efficiency ◽  
Reduced Water ◽  
N Use

An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during the aman season of 2012 to investigate the effects of prilled urea (PU), urea super granule (USG) and NPK briquette on NH4- N concentration in field water, yield and nitrogen (N) use efficiency (NUE) of BR22 rice under reduced water conditions. The experiment was laid out in a randomized complete block design with three replications. There were altogether eight treatment combinations viz. T1: Control (No N fertilizer), T2: 52 kg N ha-1 from USG, T3: 104 kg N ha-1 from USG, T4: 78 kg N ha-1 from PU, T5: 120 kg N ha-1 from PU, T6: 51 kg N ha-1 from NPK briquette, T7: 78 kg N ha-1 from USG and T8: 78 kg N ha-1 from NPK briquette. Water samples were collected from rice field for seven consecutive days after deep placement of USG and the first split application of PU and the samples were analyzed for NH4-N. The Highest concentration of NH4-N in water was observed at the second day of PU application followed by gradual decrease with time. The yield contributing characters like plant height, panicle length, number of effective tillers hill-1 and grains panicle-1 were significantly influenced by different treatments. The highest grain yield of 3.93 t ha-1 was recorded from 104 kg N ha-1 as USG (T3) and the lowest value of 2.12 t ha-1 was obtained from control. The N use efficiency was increased when the N was applied as USG. The overall results revealed that application of USG and NPK briquette may be practised for obtaining better yields in addition to increasing the efficiency of N fertilizer. DOI: http://dx.doi.org/10.3329/jbau.v11i2.19897 J. Bangladesh Agril. Univ. 11(2): 215-220, 2013

scholarly journals Nitrogen Rate and Application Timing Affect `Beauregard' Sweetpotato Yield and Quality

HortScience ◽  
2005 ◽  
Vol 40 (1) ◽  
pp. 214-217 ◽  
Author(s):  
S.B. Phillips ◽  
J.G. Warren ◽  
G.L. Mullins
Keyword(s):  
Agricultural Research ◽  
N Uptake ◽  
Maximum Yield ◽  
N Fertilizer ◽  
N Use Efficiency ◽  
Root Yield ◽  
Application Timing ◽  
Use Efficiency ◽  
N Requirement ◽  
N Use

Previous work suggests that `Beauregard' sweetpotato [Ipomoea batatas (L.) Lam.] has a much lower N requirement than other common cultivars. Over the past 10 years, `Beauregard' has become the premier sweetpotato cultivar grown in Virginia; however, N fertilizer recommendations have not been reassessed to consider the potentially lower N requirement of `Beauregard'. The objectives of this study were to evaluate the effects of N rate and application timing on root yield, quality, and N use efficiency for `Beauregard' sweetpotato production in Virginia. A field study was conducted each year from 2000 to 2002 at the Eastern Shore Agricultural Research and Extension Center, Painter, Va. Nitrogen fertilizer was applied at rates of 28, 56, and 84 kg·ha-1 either before transplanting, 2 to 3 weeks after transplanting (WAT), or 4 to 5 WAT. A check treatment that received no N fertilizer was also included. Optimum N rates varied annually; under normal precipitation, root yield was greatest at the 28-kg·ha-1 rate, while 56 kg·ha-1 was required for maximum yield in wet conditions. Of note is that this range of rates is considerably lower than the current N recommendation for Virginia sweetpotato production (56 to 84 kg·ha-1). Delaying N application until 2 to 3 WAT further increased marketable root yield compared with applying N before transplanting or 4 to 5 WAT. Crude protein and N uptake increased with increasing N rate up to 84 kg·ha-1; however, N use efficiency was highest (67%) when 28 kg·ha-1 was applied 2 to 3 WAT.

Effects of nitrogen fertilization on yield and nitrogen-use efficiency of durum wheat in Tunisia: a meta-analysis

2020 ◽  
Author(s):  
Amir Souissi ◽  
Haithem Bahri ◽  
Hatem Cheikh M’hamed ◽  
Mohamed Annabi
Keyword(s):  
Durum Wheat ◽  
Crop Residues ◽  
Meta Analysis ◽  
Experimental Studies ◽  
N Use Efficiency ◽  
No Tillage ◽  
Nitrogen Use ◽  
Bioclimatic Zone ◽  
Use Efficiency ◽  
N Use

<p>Durum wheat (<em>Triticum durum</em> Desf.) is a crucial food crop and has occupied important areas in Tunisia. However, its production remains low and unstable even though the effort of intensification of this crop has been undertaken for many decades. Likewise, Nitrogen (N) is a major limiting input factor for the crop production. In this vein, the main objective of this meta-analysis is to quantify N-use efficiency of N-fertilizer (NUE) of durum wheat in Tunisia from published studies according to the type of crop management and bioclimatic zone. Nine hundred thirty-six observations (including grain yield and NUE as dependent variables) were extracted from 51 published studies, corresponding to trials conducted in rain-fed or irrigated, and conducted in conventional system or no-tillage. The results demonstrated that yields obtained within the experimental studies were below the cultivar potential yield, even at irrigated conditions. The grain yields obtained in no-tillage trials were lower (-26%) than those in conventional tillage ones. On the other hand, N-use efficiency was small and varied between 36 and 58 kg kg<sup>-1</sup> N depending on the bioclimatic zone. Overall, the effect of irrigation on N-use efficiency was significantly positive (+16.4 kg kg<sup>-1</sup> N; <em>p <0.05</em>) under conventional systems. Whereas NUE response to no-tillage was significantly negative (-12.1 kg kg<sup>-1</sup> N; <em>p <0.001</em>) under rain-fed conditions. This latter is due mainly to the limitation of conservation agriculture (CA) in Tunisia to only no tillage practice and the negligence of the two other principles of CA namely crop rotations/species diversity, and soil cover by crop residues (at least 30% of the soil surface covered by crop residue at crop sowing). Therefore, enhancing N-use efficiency of durum wheat in Tunisia is paramount to increase production and avoid nitric pollution issues. This feature involves a best management of N-fertilization via synchronizing the timing and quantity of the nitrogen supply with the plant needs, and via using decision-making tools such as chlorophyll meter SPAD and GreenSeeker<sup>®</sup>, in order to accomplish this synchronization. The nexus between water and nitrogen in the soil is essential since it has conditioned the nitrogen use by durum in Mediterranean conditions.</p>

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