Relative Efficacy of Liquid Nitrogen Fertilizers in Dryland Spring Wheat

Walsh, Olga S.; Christiaens, Robin J.

doi:10.1155/2016/6850672

Cited by 10 publications

(10 citation statements)

References 14 publications

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“…However, damage of the flag leaf tips seems to be well tolerated by wheat, as confirmed by the appreciable yield and grain quality improvements reached by all foliar treatments, regardless of the fertilizer choice between UAN and urea. This is in agreement with the findings of several authors [11,24,26], while other studies [15,30] reported a higher threshold, i.e., 40 kg ha −1 as a single application between stages ZDS 39 (flag leaf visible) and ZDS 73 (early milk development), without compromising productivity.…”

Section: Discussionsupporting

confidence: 93%

Comparing Soil vs. Foliar Nitrogen Supply of the Whole Fertilizer Dose in Common Wheat

et al. 2021

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Late-season N application through foliar spraying is recognized as an efficient agronomic practice for improving grain quality in common wheat, although the major part of N is still supplied by soil fertilization. This study assessed the impact of various N doses entirely applied by repeated foliar sprayings on wheat growth, yield and quality, in comparison with conventional soil fertilization management with a recommended dose of 160 kg N ha−1 as ammonium nitrate (C-M). Doses of 96, 104 and 120 kg N ha−1 as both UAN (urea-ammonium-nitrate) and urea applied by foliar spraying were evaluated in a 2-year field trial in Northern Italy in a silty loam soil with 1.7% organic matter. Here, it was demonstrated that the canopy greenness was similar in all treatments, with slight grain yield increases by the lowest foliar N dose vs. C-M. The higher N foliar doses mainly improved the grain protein content and both high- and low-molecular-weight glutenin subunits (HMW-GS, LMW-GS), particularly with urea. It is concluded that in our fertile soil, managing N fertilization exclusively through foliar spraying is feasible without compromising grain yield and ameliorating quality at the same time. Improved nutrient use efficiency and beneficial environmental effects are also expected by reducing the nitrogen load on the agricultural fields by 25–40%.

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Section: Discussionsupporting

confidence: 93%

Comparing Soil vs. Foliar Nitrogen Supply of the Whole Fertilizer Dose in Common Wheat

et al. 2021

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“…In fact, only in 3 of 8 site-years fertilization at N rate of 168 kg N ha −1 resulted in higher protein yield values, whereas grain yield did not respond to fertilization, whereas grain yield did not respond to fertilization above 56 kg N ha −1 at 4 of 8 site-years. Walsh and Christiaens (2016) reported the The Montana State University's recommendation (developed in the 1990s using the wheat N response trials carried out in the late 1970s-1980s) for dryland spring wheat is 1.5 kg N per 27 kg of wheat grain (Jacobsen, Jackson, & Jones, 2005). Considering these guidelines and the average grain yields of 4.8 Mg ha −1 , the optimum N rate for this study should have been 290 kg N ha −1 .…”

Section: Grain Yieldmentioning

confidence: 99%

Nitrogen fertilizer rate and time effect on dryland no‐till hard red spring wheat production

Walsh

2020

Agrosystems Geosci & Env

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Increasing the efficiency of wheat (Triticum aestivum L.) production is vital for Montana growers' sustainability and competitiveness in the market. Nitrogen fertilizer applications at the right rate and time in the growing season are important for optimizing wheat grain yield and quality. Two dryland field experiments were conducted in North Central Montana in 2014. The effects of N fertilizer rates (28, 84, and 140 kg N ha −1) and application times (seeding, tillering, jointing, and flag leaf emergence) on grain yield, test weight, protein content, protein yield, grain N uptake, and N use efficiency (NUE) were evaluated. Wheat grain yield and protein content was the highest with N fertilizer applied at 140 kg N ha −1 rate at tillering. Delaying N fertilizer until flag leaf resulted in significantly lower wheat yields and grain protein values. It is possible that higher N rates would have allowed to maximize both yield and protein content. Nitrogen use efficiency was the highest with N fertilization at tillering and jointing. Nitrogen response trials coupled with historical yield records did not provide accurate estimates of optimum N rates. Close monitoring of crop nutrient status throughout the growing season (using destructive sampling and/or crop sensors), coupled with appropriate preplant soil testing, and splitting N applications to tailor N supply with crop demand should help to improve NUE.

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“…In another N-response study in Montana, wheat yield was optimized with 120 kg N ha −1 ; in 4 of 8 site-years, yield did not respond to N rate above 56 kg N ha −1 (Walsh & Girma, 2016). A rate of 125 kg N ha −1 was adequate to optimize dryland spring wheat grain yield in Montana (Walsh and Christiaens (2016). The Montana State University N fertilizer recommendations are currently under review to address the changes in grower practices and higher NUE of recently released wheat varieties.…”

Section: Nitrogen Use Efficiencymentioning

confidence: 99%

Seeding rate and nitrogen fertilizer rate effect on dryland no‐till hard red spring wheat yield and quality

Walsh

2020

Agrosystems Geosci & Env

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Increasing the efficiency of spring wheat (Triticum aestivum L.) production is vitally important to Montana growers' bottom line. In semiarid regions of the Northern Great Plains, agronomic practices must aim at maximum capture and utilization efficiency of plant growth resources. Appropriate plant population and N management are important for optimizing wheat yield and quality by enhancing N uptake and improving nitrogen use efficiency (NUE). Field experiments were conducted in 2014 at two locations in northcentral Montana. The aim of this study was to assess the effect of four N levels (0, 28, 84, and 140 kg N ha −1) in dryland no-till hard red spring wheat seeded at two seeding rate levels (67 and 135 kg ha −1 pure live seed [PLS]). Nitrogen rate significantly improved wheat grain yield, grain protein content, protein yield, and N uptake at both locations, and NUE at one of two locations. The 135 kg ha −1 did not have an advantage over the 67 kg ha −1 PLS seeding rate, resulting in comparable wheat grain parameters, N uptake, and NUE. Wheat yield and quality was highest at 140 kg N ha −1 ; higher N rate (especially split-applied) may have improved wheat production (especially grain protein content) further.

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Relative Efficacy of Liquid Nitrogen Fertilizers in Dryland Spring Wheat

Cited by 10 publications

References 14 publications

Comparing Soil vs. Foliar Nitrogen Supply of the Whole Fertilizer Dose in Common Wheat

Comparing Soil vs. Foliar Nitrogen Supply of the Whole Fertilizer Dose in Common Wheat

Nitrogen fertilizer rate and time effect on dryland no‐till hard red spring wheat production

Seeding rate and nitrogen fertilizer rate effect on dryland no‐till hard red spring wheat yield and quality

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