Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

Libório, C. B.; Verzignassi, J. R.; Fernandes, C. D.; Valle, Cacilda Borges do; Lima, N. D.; Monteiro, Lenise Castilho

doi:10.1590/0103-8478cr20160500

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…For germination, seed immersion in KNO 3 for 12, 24, and 36 h was the most favorable for all concentrations equal to or greater than 2% (Table 2), with values between 59% and 72%. In contrast, in a previous study (Libório et al, 2017) seed immersion treatment of U. humidicola BRS Tupi in KNO 3 solution at concentrations below 1% did not yield promising results.…”

Section: First Stage Of the Researchcontrasting

confidence: 73%

“…For the formation of pastures, it is necessary to use seeds of high physical and physiological quality. However, the seeds of U. humidicola exhibit a high percentage of dormancy (above 40%), and this state persists for periods greater than 12 months (Costa, Araújo, & Villa Bôas, 2011;Libório et al, 2017). In the field, dormancy causes variation in the emergence of seedlings, impairing the establishment of pastures, and favoring the invasion of weeds (L. Martins & Silva, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Martins & Silva, 2001;MAPA, 2009). To determine the favorable effects of KNO 3 in overcoming dormancy and promoting germination, some researchers have immersed grass seeds in this solution, dried them, and sown them later, thereby obtaining promising results (Binotti et al, 2014;Libório et al, 2017;C. C. Martins, Velini, & Martins, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Pereira

Jeromini

Neves

et al. 2021

Semina: Ciênc. Agrár.

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The main difficulty with propagating Urochloa humidicola Comum is the high percentage of seed dormancy. Thus, the objective of this study was to develop a treatment to overcome seed dormancy and promote seed germination of this species that can be applied at a large scale. This study was conducted in two stages. First, the following treatments were evaluated using one seed lot: control (without treatment), immersion in H2SO4 (98%, 36N) for 10 min, moistening the germination substrate with KNO3 (0.2%) and immersion in KNO3 at concentrations of 0%, 2%, 4%, 6%, and 8% for periods of 12, 24, 36, and 48 h, followed by drying in the shade. In the second stage, three seed lots were evaluated in all of the aforementioned treatments, except for those of immersion in 0% KNO3 and of all concentrations for 36 and 48 h. The seeds were evaluated for water content, germination, percentage of abnormal seedlings, dead and dormant seeds, first count, and average germination time. Immersion in the KNO3 solution was efficient in overcoming dormancy and promoting germination. To be used by companies, the immersion of seeds in a 4% KNO3 solution for 24 h was the most suitable treatment to overcome dormancy and promote the germination of U. humidicola Comum seeds.

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Section: First Stage Of the Researchcontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Pereira

Jeromini

Neves

et al. 2021

Semina: Ciênc. Agrár.

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“…Alternating temperatures along with KNO 3 probably act in breaking seed dormancy and accelerating germination. Seed germination studies conducted on other grass species using KNO 3 have also reported positive results, with increased germination rates being detected for Triticum aestivum Matus-Cádiz & Hucl 2003), Sorghum hapelense (Baličević et al 2016), Buchloë dactyloides (Kreuser et al 2016), Brachiaria brizantha (Batista et al 2016), and Brachiaria humidicola (Libório et al 2017). According to Roberts (1972) and Ellis et al (1983), the effect of potassium nitrate as a dormancy-breaking agent may derive from its oxidative and electron-acceptor features, which contribute to stimulating the pentose phosphate pathway, which in turn is probably associated with the neutralization or decrease of seed dormancy (Roberts 1972;Ellis et al 1983).…”

Section: Discussionmentioning

confidence: 97%

“…Temperature also plays a role in controlling seed dormancy (Offord & Meagher 2001), which is often interpreted as an adaptive response of a particular species to stress conditions (Garwood 1983;Mathias & Kisdi 2002), by means of increased adaptability and decreased germinability during an unfavorable time for seedling establishment (Keya 1997). Along with temperature, chemicals like KNO 3 have been revealed to be able to break seed dormancy, contributing to accelerate germination not only in grasses (Akamine 1944;Garber et al 1974;Eira 1983;Gazziero et al 1991;Frank & Nabinger 1996;Figueiredo et al 2012;Baličević et al 2016;Batista et al 2016;Kreuser et al 2016;Richard et al 2016;Libório et al 2017) but also in species from other plant groups (Wei et al 2010;Bian et al 2013;Cárdenas et al 2013;Lay et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Seed germination and dormancy break in Eragrostis polytricha, a native Brazilian grass species with potential for recovery of degraded lands

et al. 2020

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Ferruginous Rocky Outcrops have high levels of species richness and endemism, but have been threatened by several anthropic actions, especially mining. Eragrostis polytricha, a common grass species in the vegetation of these outcrops, has shown promising features for use in the recovery of mining areas. However, in order to fully understand the species' potential for such use, its requirements for germination, seed dormancy break and seedling development must be determined. Thus, we aimed to: (1) assess the temperature conditions needed for seeds of E. polytricha to germinate; (2) evaluate the effects of KNO₃ in breaking seed dormancy; and (3) analyze the germination efficiency of seeds that are still in spikelets. The experiment included seven treatments: 15-35 ºC with KNO₃, 20-30 ºC with KNO₃, 15 ºC with KNO₃, 25 ºC with KNO₃, 35 ºC with KNO₃, 20-30 ºC with water, and 20-30 ºC with KNO₃ using spikelets. The treatments with alternating temperatures associated with KNO 3 yielded the highest germination rates, suggesting that these two factors combined can break seed dormancy. Seeds inside spikelets exhibited a high germination percentage, and thus represent an interesting alternative for seedling production.

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The effect of cutting regime and genotype on growth, seed yield, seed quality and herbage yield of seven Urochloa (syn. Brachiaria) grass genotypes in the Adamawa region of Cameroon

Ojong,

Takor,

Egbe

et al. 2024

Grassland Science

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The performance of seven Urochloa grass genotypes (three worldwide cultivars cv. Basilisk, cv. Piata, cv. Xaraes and four landrace cv. Adamaoua1, cv. Adamaoua2, cv. North1 and cv. North2) subjected to two cutting regimes (mid‐June cut and mid‐July cut) was evaluated for regrowth characteristics, seed yields, seed quality and herbage production in 2020 and 2021 cropping seasons at Wakwa, Ngaoundere, Cameroon. This divergence in harvesting practices raises concerns regarding the effectiveness and efficiency of forage utilization, as well as the potential impact on livestock productivity and sustainable farming systems. A split plot design with five replications and a 1‐year‐old sward was used for the study. In both years, genotypes were significantly different for plant height and tiller numbers at 12 weeks after cutting (P ≤ 0.007). In 2020, the dry matter yield (DMY) ranged between 8.78 t/ha (cv. Piata) and 12.75 t/ha (cv. Xaraes) for June cut regrowth and between 7.69 t/ha (cv. Piata) and 10.26 t/ha (cv. Xaraes) for July cut regrowth. In 2021, DMY ranged between 6.06 t/ha (Adamaoua2) and 13.95 t/ha (cv. Xaraes) for the June cut and between 6.55 t/ha (cv. Adamaoua2) and 10.47 t/ha (cv. Basilisk) for the July cut. For flowering behavior and seed yields, Basilisk flowered earliest while cv. Xaraes flowered latest. In 2020, seed yields were 74.80 kg/ha and 107.72 kg/ha for June cut and July cut regrowth, respectively, whereas in 2021, seed yields were 331 kg/ha and 431 kg/ha for June cut and July cut regrowth, respectively. cv. Adamaoua1 produced the highest seed yield in both years. The cutting regimes evaluated in this study were indifferent for DMY and seed yield.

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Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

Abstract: In this study, the aim was to determine the influence of potassium nitrate, using different concentrations and immersion times on the dormancy of the seeds of Brachiaria humidicola cv. 'BRS

Cited by 4 publications

References 5 publications

Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Seed germination and dormancy break in Eragrostis polytricha, a native Brazilian grass species with potential for recovery of degraded lands

The effect of cutting regime and genotype on growth, seed yield, seed quality and herbage yield of seven Urochloa (syn. Brachiaria) grass genotypes in the Adamawa region of Cameroon

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