Nitrogen fertilization in top dressing for wheat crop in succession to soybean under a no-till system

Galetto, Shivelly Los; Bini, Ângelo Rafael; Haliski, Adriano; Scharr, Danilo Augusto; Borszowskei, Paulo Rogério; Caires, Eduardo Fávero

doi:10.1590/1678-4499.095

Cited by 6 publications

(5 citation statements)

References 33 publications

(42 reference statements)

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“…Increasing the N rate did not change the P-grain concentration, in all wheat-cropping seasons, and increased the K-grain concentration only for wheat grown after maize in 2015. Even though the improvements in P and K plant nutrition with the N rates applied in top dressing were slight, a synergistic effect of both N × P and N × K interactions may have occurred in our study, especially for P in maize (Table 4) and K in wheat (Table 5), as reported in other studies (Los Galetto et al, 2017;Rufty, MacKown, & Israel, 1990). In addition, the increase in N provided by top-dressing fertilization may have favored plant root growth (Caires, Zardo Filho, Barth, & Joris, 2016;Xue et al, 2014) and increased P and K uptake due to increased soil volume exploration by roots.…”

Section: Amendment Effects On Soil and Plant Nutritionsupporting

confidence: 75%

“…In addition, N translocation from leaves to grains is high. Several studies conducted under NT systems in Brazil have shown an increase in N‐leaf concentration of maize (Caires & Milla, 2016; Soratto, Silva, Cardoso, & Mendonça, 2011) and wheat (Los Galetto et al., 2017; Teixeira Filho, Buzetti, Andreotti, Arf, & Sá, 2011) with increasing N rate application. In grains, an increase in N concentration was also obtained with top dressing N fertilization compared to N application only at sowing of maize (Pedrosa et al., 2020) and with increasing N rate application in top dressing of wheat (Los Galetto et al., 2017; Rodrighero et al., 2015).…”

Section: Resultsmentioning

confidence: 99%

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Seed inoculation with Azospirillum brasilense and nitrogen fertilization for no‐till cereal production

et al. 2020

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Cereal crops have a high N requirement in a high‐yield environment. However, N use efficiency is still low in agricultural production systems and little is known about the effects of inoculation with Azospirillum brasilense in a high‐yield environment. A field experiment was conducted from 2012 to 2018 with a maize (Zea mays L.)–wheat (Triticum aestivum L.) rotation under a continuous no‐till in southern Brazil. Seeds were inoculated with A. brasilense (strains Ab‐V5 and Ab‐V6) and different levels of N fertilization were used in top dressing. Seed inoculation provided slight changes in N, P, and K concentrations in leaves and grains of maize and wheat. Increasing N input increased the leaf and grain N concentration and the maize and wheat grain yields. Seed inoculation caused varied responses on cereals in different cropping seasons. Wheat was more affected by inoculation in response to N application than maize. Rainfall distribution during the growing seasons possibly interfered on crop responses with inoculation between years and N fertilization levels. Under a similar N input, inoculation resulted in an average increase of 454 kg ha−1 yr−1 of maize and 242 kg ha−1 yr−1 of wheat by applying a higher N rate to the maize and a lower N rate to the wheat. An additional gain of US$409.72 ha−1 (2012–2018) was also achieved using this strategy. Although the possibility of inoculation causing economy with N fertilization in wheat was evident, for maize in rotation with wheat, A. brasilense inoculation was apparently more viable under higher N fertilizer input.

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Section: Amendment Effects On Soil and Plant Nutritionsupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Seed inoculation with Azospirillum brasilense and nitrogen fertilization for no‐till cereal production

et al. 2020

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“…In our study conducted on an Oxisol with 35 g dm −3 of organic matter in the topsoil (Table 1), a rate of 55 kg N ha −1 for wheat cultivar Quartzo following soybean provided a maximum economic return to obtain grain yield of 4250 kg ha −1 . Similar results under a soybean-wheat system were found in other studies, with wheat responding economically to the rate of 35 kg N ha −1 for yield around 3100 kg ha −1 [38], and to the rate of 61.5 kg N ha −1 for yield around 4000 kg ha −1 [17]. It is true that to provide more appropriate N recommendations for wheat, our study should have comprised more cultivars, soils, locations, and years.…”

Section: Effect Of N Fertilization On Wheat Shoot Dry Matter and Graisupporting

confidence: 84%

“…Based on the regression equation for grain yield (Fig. 2b) Since the soil N availability is dependent on mineralization of organic matter [5] and due to the essential role of N in high-yield systems [7], positive effects of N fertilization on wheat yields have been frequently observed in studies conducted on Brazilian soils [11,17,28]. In our study conducted on an Oxisol with 35 g dm −3 of organic matter in the topsoil (Table 1), a rate of 55 kg N ha −1 for wheat cultivar Quartzo following soybean provided a maximum economic return to obtain grain yield of 4250 kg ha −1 .…”

Section: Effect Of N Fertilization On Wheat Shoot Dry Matter and Graimentioning

confidence: 99%

Nitrogen fertilization for wheat following soybean and interfering factors on spectral reflectance readings

2020

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A field experiment examined the wheat response following soybean due to urea-N fertilization at sowing (0, 20, 40, and 60 kg N ha −1) and top dressing (0, 30, 60, and 90 kg N ha −1). Normalized difference vegetation index (NDVI) measurements using a GreenSeeker active sensor were taken at different growth stages, at various sensor heights above the canopy, and at different times of day. Both the shoot dry matter yield and the grain yield were not affected by N fertilization at sowing and increased with increasing N rates at top dressing. A maximum economic yield was obtained at 55 kg N ha −1 in top dressing, causing a 33% increase in grain yield and an economic return of US$ 189.50 ha −1. Differences in NDVI were found before and after top-dressing N fertilization, indicating that GreenSeeker was efficient in monitoring wheat N nutrition. NDVI varied depending on the measurement distance, stabilizing from 0.30 to 1.20 m above the canopy. Because of the influence of incident radiation, higher NDVI values were obtained at the beginning and end of the day. The results suggest that for the wheat cultivar Quartzo following soybean under minimum soil disturbance, while there is no need to apply N at sowing, an important increase in grain yield can be obtained with top-dressing N fertilization. In addition, to improve the accuracy in developing N fertilizer recommendation models using GreenSeeker, a consistent protocol for spectral reflectance readings, mainly regarding the time of day, is required.

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“…Wheat (Triticum aestivum) is one of the most important crops in the maintaining of the security of the food supply and is the second most consumed cereal worldwide (Galetto et al, 2017;Franco et al, 2018;Oliveira and Pinto-Maglio, 2017). Drought is one of the main constraints affecting wheat production, and is found in virtually all climatic regions, providing a huge challenge to local farming in many countries worldwide (Lobell et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A

Ballesta

Mora

Pozo

2020

Sci. agric. (Piracicaba, Braz.)

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Drought is likely the main abiotic stress that affects wheat yield. The identification of drought-tolerant genotypes represents an effective way of dealing with the continuous decrease in water resources as well as the increase in world population. The aim of this study was to identify single nucleotide polymorphisms (SNP) associated with drought tolerance indices in wheat by using a genome-wide association study (GWAS) under fully irrigated and rain-fed conditions. The drought tolerance indices (i.e., Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index and Yield Stability Index) were calculated based on grain yield, 1,000-kernel weight and kernels per spike. The association panel was genotyped using genotyping-bysequencing (GBS). A total of 175 SNPs exhibited statistical evidence of association with at least one drought tolerance index, explaining up to 6 % of the phenotypic variation. Forty-five SNPs were associated with more than one tolerance index (up to 4 agronomic traits). Most associations were located on chromosome 4A, supporting the hypothesis that this chromosome has a key role in drought tolerance which should be exploited for wheat improvement. In addition, statistical analysis detected SNPs associated with tolerance indices in both growing seasons, providing information about genetic regions with stable effects under different environmental conditions. This GWAS experiment serves as one of the few studies on association mapping for drought tolerance indices in wheat, which could increase the efficiency of rain-fed and irrigated crop production.

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Nitrogen fertilization in top dressing for wheat crop in succession to soybean under a no-till system

Cited by 6 publications

References 33 publications

Seed inoculation with Azospirillum brasilense and nitrogen fertilization for no‐till cereal production

Seed inoculation with Azospirillum brasilense and nitrogen fertilization for no‐till cereal production

Nitrogen fertilization for wheat following soybean and interfering factors on spectral reflectance readings

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A

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