Respuesta del rendimiento del maíz a fósforo, azufre y zinc en la provincia de Entre Ríos, Argentina

The nutrients that mainly condition the yields of extensive crops in Argentina are nitrogen and phosphorus, but the lack of replenishment and continuous agricultural activity have produced a decrease in the availability of other nutrients and could currently become limiting. These include zinc and sulfur. The use of fertilizers with only P and N at the sowing of the maize crop has been a traditional practice in the province of Entre Ríos. Currently other sources have valuesclose to their concentration in terms of these nutrients (P and N) and have S and Zn in their composition. With the objective of evaluating the effect of the application of P, S and Zn versus only P, 10 trials were carried out in producers' fields during three campaigns in different localities of the province of Entre Ríos, Argentina. In a joint analysis it was observed that the addition of P produced an increase in corn yield by 13% and a more complete fertilization (PSZn) by 21%, both treatments were statistically different from the control (p<0.05). When carrying out a contrast study between the traditional fertilization treatment (only with P) versus a more complete fertilization (PSZn) it yielded a p-value of 0.06, which leads us to conclude that there is a strong tendency to increase yield of corn with this fertilization.EEA ParanáFil: Pautasso, Juan Manuel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná. Agencia de Extensión Rural Diamante; ArgentinaFil: Rotondaro, R. Asociación de Cooperativas Argentinas Coop. Ldta; Argentin

Estrategias de confort integral adaptables a la vivienda rural de clima frío

Trabajo de investigaciónDentro de esta investigación se analizaron las condiciones de bajas temperaturas, déficit de ventilación e iluminación natural en tres viviendas rurales localizadas en el municipio de Toca, Colombia con el objetivo de identificar estrategias constructivas adaptables a la vivienda existente y así, mejorar el bienestar integral de los habitantes de las mismas: población de la tercera edad.1. INTRODUCCIÓN 2. PLANTEAMIENTO DEL PROBLEMA 3. OBJETIVOS 4. HIPOTESIS 5. JUSTIFICACIÓN 6. ESTADO DEL ARTE 7. MARCO CONCEPTUAL 8. METODOLOGIA DE LA INVESTIGACIÓN 9. FASE DESCRIPTIVA 10. FASE ANALITICA 11. FASE EXPERIMENTAL 12. FASE PROYECTIVA 13. EVALUACIÓN DE SOSTENIBILIDAD 14. RESULTADOS 15. CONCLUSIONES 16. REFERENCIASMaestríaMagíster en Diseño Sostenibl

Micro- Reactors For Testing Sensor Devices Based On Suspended Carbon Nanotubes

In this work, we report the fabrication of micro-reactors for the characterization of nano-sensors based on suspended nanoparticle-decorated carbon nanotubes (CNTs/NPs). The capsules were fabricated from a single Kovar® piece, having a small volume chamber (100μl). Gold thin films were sputtered onto Si/SiO2 substrates and the electrodes were patterned using electrochemical deposition, photolithography and wet chemical corrosion. In order to obtain devices based on suspended nanotubes, prior to CNTs deposition, a 1μm wide and 5μm deep gap was milled in the substrate by focused ion beam (FIB). The dielectrophoresis (DEP) technique was used for the deposition of the suspended CNTs over the as obtained patterned electrodes. The sensors were tested using oxygen and nitrogen atmospheres, in the pressure range between 10-5 and 10-1mbar. The small chamber volume allowed the measurement of fast sensor characteristic times, with the sensors showing good sensitivity towards gas and pressure as well as high reproducibility. © The Electrochemical Society.491191197Pan, C., Zhu, J., (2009) J. Mater. Chem., 19, p. 869Rao, C.N.R., Deepak, F.L., Gundiah, G., Govindaraj, A., (2003) Prog. Solid State Chem., 31, p. 5Kuchibhatla, S.V.N.T., Karakoti, A.S., Bera, D., Seal, S., (2007) Prog. Mater Sci., 52, p. 699Fang, X., Bando, Y., Liao, M., Gautam, U.K., Zhi, C., Dierre, B., Liu, B., Golberg, D., (2009) Adv. Mater., 21, p. 2034Velamakanni, A., Ganesh, K.J., Zhu, Y., Ferreira, P.J., Ruoff, R.S., (2009) Adv. Funct. Mater., 19, p. 3926Kolmakov, A., Moskovits, M., (2004) Annu. Rev. Mater. Res., 34, p. 151Chen, Y.Q., Jiang, J., Wang, B., Hou, J.G., (2004) J. Phys. D: Appl. Phys., 37, p. 3319Savu, R., Joanni, E., (2006) Scr. Mater., 55, p. 979Cheng, K.W., Lin, Y.T., Chen, C.Y., Hsiung, C.P., Gan, J.Y., Yeh, J.W., Hsieh, C.H., Chou, L.J., (2006) Appl. Phys. Lett., 88, p. 043115Cao, B., Cai, W., (2008) J. Phys. Chem. C, 112, p. 680Yoshimura, M., Byrappa, K., (2008) J. Mater. Sci., 43, p. 2085Moshkalev, S.A., Verissimo, C., (2007) J. Appl. Phys., 102, p. 044303Valcarcel, M., Simonet, B.M., Cardenas, S., Suarez, B., (2005) Anal. Bioanal. Chem., 382, p. 1783Brahim, S., Colbern, S., Gump, R., Moser, A., Grigorian, L., (2009) Nanotechnology, 20, p. 235502Gelamo, R.V., Rouxinol, F.P., Verissimo, C., Vaz, A.R., De Moraes, M.A.B., Moshkalev, S.A., (2009) Chem. Phys. Lett., 482, p. 302Van Leeuwen, M., Heijnen, J.J., Gardeniers, H., Oudshoorn, A., Noorman, H., Visser, J., Van Der Wielen, L.A.M., Van Gulik, W.M., (2009) Chem. Eng. Sci., 64, p. 455Iijima, S., (1991) Nature, 354, p. 56Shin, W.C., Besser, R.S., (2006) J. Micromech. Microeng., 16, p. 731Shen, G., Chen, P.C., Ryu, K., Zhou, C., (2009) J. Mater. Chem., 19, p. 828Comini, E., Baratto, C., Faglia, G., Ferroni, M., Vomiero, A., Sberveglieri, G., (2009) Prog. Mater Sci., 54, p. 1Goldoni, A., Petaccia, L., Lizzit, S., Larciprete, R., (2010) J. Phys.: Condens. Matter., 22, p. 013001Abgrall, P., Nguyen, N.T., (2008) Anal. Chem., 80, p. 2326Dai, L., Soundarrajan, P., Kim, T., (2002) Pure Appl. Chem., 74, p. 1753Tiggelaar, R.M., Van Male, P., Berenschot, J.W., Gardeniers, J.G.E., Oosterbroek, R.E., De Croon, M.H.J.M., Schouten, J.C., Elwenspoek, M.C., (2005) Sens. Actuators, A, 119, p. 196Leon, J., Flacker, A., Vaz, A.R., Verissimo, C., Moraes, M.B., Moshkalev, S.A., (2010) J. Nanosci. Nanotechnol., 10, p. 6234Gelamo, R.V., Rouxinol, F.P., Verissimo, C., Vaz, A.R., De Moraes, M.A.B., Moshkalev, S.A., (2009) Chem. Phys. Lett., 482, p. 306Gelamo, R.V., Rouxinol, F.P., Verissimo, C., De Moraes, M.A.B., Moshkalev, S.A., (2010) Sens. Lett., 8, p. 48