México ocupa actualmente el cuarto lugar mundial en producción de sorgo. En el estado de Sonora, este cultivo es uno de los más productivos. Los mayos, un pueblo amerindio que habita en el sur del estado mexicano de Sonora, ha estado promoviendo sistemas sustentables de producción agrícola. La aplicación de bioderivados de exoesqueletos de crustáceos como el quitosano (QUI) y microorganismos promotores del crecimiento vegetal, endomicorrízicos, simbiontes, benéf icos, y antagonistas, en algunos cultivos han mostrado ser una alternativa en el proceso de germinación y mejoras de rendimientos de cosecha; sin embargo, con relación al sorgo de grano, son limitados lo estudios sobre el efecto de éstos bioderivados como el QUI y consorcios microbianos. El objetivo de la investigación consistió en evaluar en sorgo de grano, el efecto de quitosano (100 y 50%) y un consorcio microbiano (en conjunto e individual forma con QUI) contra fertilización tradicional, en la región indígena del Mayo en Basconcobe, Etchojoa, Sonora, en la inducción fenológica, rendimiento y calidad proteica del grano. Se utilizó un diseño experimental de bloques al azar, con siete tratamientos a evaluar y cinco repeticiones Como variables respuesta se midieron: tasa de germinación, clorof ila total, y en madurez f isiológica la altura de planta, longitud de panoja, rendimiento ha-1 y proteína en grano. Los resultados indican que, en rendimiento y calidad proteica del grano de sorgo, el tratamiento más ef iciente (con P < 0.05), fue con QUI 100% + consorcio microbiano utilizando al 50% una fertilización regional. Estos resultados expresan la posibilidad de utilizar el quitosano como un biofertilizante de origen marino conjuntamente con un microbiano en un sistema de producción de sorgo.

Development of microparticles based on natural polymers has been of interest for researchers due to their applications, such as release systems. Currently, one of the problems presented by agriculture worldwide is the loss of fertilizers, i.e., urea, causing environmental pollution and high costs. The aim of this work was to develop microparticles of wheat glutenins by means of electrospray technique, with potential application as a urea controlled-release system in agricultural soils. The microparticles of wheat glutenins were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). In addition, a release kinetic test was performed to evaluate the possible behaviour of wheat-glutenin microparticles in agricultural soils with pH 4, 7 and 10, using buffers as the release medium. TGA indicated that microparticle stability was >100 • C, while FT-IR demonstrated the existence of physical interactions between urea and wheat glutenins. The kinetic tests showed the possible behaviour of the controlled-release fertilizer at pH 4, 7 and 10; rapid release at acidic pH and a decrease in release time at basic pH. With these results, we can conclude that the urea-charged wheat-glutenin microparticles can function as a controlled-release fertilizer in agricultural soils.

<p>The multiple effects in agriculture due to plant morphogenic conditions lead to the concern to search viable alternatives for the propagation and feasible development of crops. Therefore, it has had to resort to new techniques, such is the case of micropropagation techniques such as cuttings, which are based on the promotion and multiplication of plants, quickly, efficiently and in large quantities; due this reason it has been considered one of the most successful biotechnological methods in agriculture. The technique of cuttings results in a new plant identical to the plant from which it precedes; this quick and simple technique can be performed on most plants. One way of guaranteeing root development properly during micropropagation techniques is the use of certain growth regulators, of which the most used are the auxins, such as indole-3-acetic acids (AIA), Naphthaleneacetic acid (ANA) and indolbutyric acid (AIB). These auxins promote the initiation of roots and have been attributed the ability to stimulate cell divisions in the radicle. In addition to the auxins, the roots of the cuttings can be favored using treatments based on hormones, microorganisms and bioactive compounds. The morphogenic characteristics of the plants and the application of treatments, among other factors, contribute to the successful establishment of a crop.</p>