Scarification treatments in chepil seeds (Crotalaria longirostrata Hook. & Arn.) used to improve their germination

Abstract

Objective: The objective was to evaluate different scarification treatments to improvegermination in chepil seeds (Crotalaria longirostrata Hook. & Arn.).Design/Methodology/Approach: The study was established in the School of VeterinaryMedicine and Zootechnics N. 2 of the Universidad Autónoma de Guerrero. The chepilseeds were weighed and counted; 2 experiments were established through a CRD with4 treatments of 4 repetitions each. Imbibition and germination were evaluated. The datawere analyzed with the statistical software package SAS® 9.0.Results: The use of water at different temperatures and times presented positive resultsin imbibition and increased the germination percentages. The treatment with water at100°C until cooling reached a germination of 80%, and the control of 12.3%. Study Limitations/Implications: Chepil is a wild species that has seeds with physicaldormancy, which is something that requires more research in order to accelerate andincrease the germination percentages.Findings/Conclusions: The imbibition and germination was affected by the treatmentsapplied. Chepil seeds presented physical or superficial dormancy that may be eliminatedwith the use of heat treatments; however, evaluations still need to be performed toaccelerate and find a higher percentage of germination.

YIELD AND CHEMICAL QUALITY OF CHEPIL (Crotalaria longirostrata Hook. & Arn) FORAGE AT DIFFERENT SEEDING DENSITIES AND CUTTING FREQUENCY

“…Chepil seeds have low germination rates ranging from 12.3 to 80 % (Rojas- García et al, 2021). Its leaves have a high protein content ranging from 30.6 to 38.3 % (Arias et al, 2003;Jiménez-Aguilar and Grusak, 2015), making it as high in quality as alfalfa; however, there are few studies on dry matter yield, physical and chemical quality (Pérez-Cornelio et al, 2016).…”

“…The chepil could be considered the alfalfa of the tropics, and it could be used in animal feed, added mainly in the diet in the form of meal, green, or silage. It is drought tolerant, provides organic matter in poor soils, and its seeds are resistant to fire (Rojas- García et al, 2021), which makes it an alternative species for the dry season. The objective of this research was to evaluate the yield and chemical quality of chepil (Crotalaria longirostrata Hook.…”

Componentes del rendimiento de Crotalaria longirostrata Hook. & Arn. en Guerrero, México

“…La comparación de los componentes del rendimiento permite el uso y rescate de la diversidad de especies silvestres con valor antrópico, como C. longirostrata, que se han incorporado y conservado en la agricultura tradicional y que están estrechamente relacionados con factores socio-culturales (Peña-Valdivia et al, 2012;Solís Bonilla et al, 2017;Castiñeiras et al, 2000;Rojas-García et al, 2021). La información de la fenología, morfología y rendimiento de las especies silvestres permite contrastar el desarrollo de las plantas in situ y ex situ, diseñar programas de conservación, propagación y cultivo de especies silvestres o semi-domesticadas (Peña-Valdivia et al, 2012).…”

“…Sin embargo, no se cuenta con esa información de las poblaciones silvestres de C. longirostrata. El rendimiento de semilla y de ciertas estructuras de la planta se ha documentado con fines agrícolas en especies como C. juncea, C. brevidens y C. ochroleuca (Jacobi et al, 2005;Tripathi et al, 2013;Meagher et al, 2019;Rojas-García et al, 2021). Tripathi et al (2013) evaluaron el efecto del espaciamiento, de 30 x 10 cm a 45 x 20 cm, entre las plantas, y la eliminación de la dominancia apical (por corte del ápice) en los componentes del rendimiento de C. juncea; los autores observaron el incremento de ramas primarias y secundarias por planta (de 7 y de 13 a 17), del número de frutos por planta (en promedio de 47 a 74) y su biomasa (15.5 a 25 g), del número de semillas por fruto (7 a 9) y su rendimiento por planta (9.6 a 15 g) con la separación de las plantas.…”

Physical and Chemical Scarification on Dormancy Breaking of Rosary Pea Seeds (Abrus Precatorius L.)

“…Damage to this area can impair seed germination. Meanwhile, damage to the cotyledons will not affect germination 1,20,30 .…”