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Guía general para la preparación de caldos minerales, extractos vegetales y caldos microbianos c aldo boRdelés Se trata de un excelente producto como fungicida y acaricida, pero también puede actuar como repelente contra algunos coleópteros. Materiales
200 200 1 1
gramos de cal viva o hidratada gramos de sulfato de cobre caneca plástica de 20 litros de capacidad balde plástico de 10 litros de capacidad
1 bastón de madera 1 machete. 20 litros de agua
Preparación
Disolver el sulfato de cobre en dos litros de agua en el balde pequeño plástico. En la caneca grande disolver los 200 gramos de cal hidratada o cal viva, en 18 litros de agua. Después de tener disueltos disueltos los dos ingredientes ingredientes por separado separado se mezclan mezclan teniendo teniendo siempre siempre el cuidado cuidado de agregar el preparado del sulfato de cobre sobre la cal. Nunca al contrario. Comprobar la acidez de la preparación para poder aplicarlo en los cultivos. Se verifica ve rifica sumergiendo un mache te en la mezcla mezcla y sisi la hoja metálica metálica se oxida oxida (manchas (manchas rojas) rojas) es porque porque está está ácida y requiere requiere más cal para neutralizarla, si esto no sucede es porque está en su punto para ser utilizada. • Dosis: El caldo bordelés, en algunos cultivos se puede aplicar puro, pero en otros lo
más recomendable es disolverlo con agua, para evitar quemar los cultivos sensibles. Para la bomba de 20 litros utilizar 15 litros de caldo bordelés y 5 litros de agua. En el cultivo del mango controla principalmente la antracnosis. Se realizan pulverizaciones (aspersiones) antes de la floración, una segunda durante el florecimiento y se pueden continuar realizando pulverizaciones cada 20 días de acuerdo a la incidencia de la enfermedad. Para cultivos como fríjol, tomate, repollo, pepino, zapallo, maracuyá: Para la bomba de 20 litros, utilizar 10 litros de caldo bordelés y 10 litros de agua. Recomendaciones:No utilizar recipientes metálicos para su preparación, no hacer aplica-
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aldo vIsosa vIsosa c aldo
El caldo visosa es una suspensión coloidal, compuesta de complejos fertilizantes con cal hidratada (hidróxido de calcio), desarrollada para el control de la roya r oya del café; el caldo visosa es un eficiente fungicida y corrige las deficiencias nutricionales. Materiales:
Sulfato de cobre 100 gramos Sulfato de zinc 120 gramos Sulfato de magnesio 80 gramos
Ácido bórico 80 gramos Cal hidratada 100 gramos Agua, 20 litros
Preparación
Se disuelve en un recipiente los sulfatos de cobre, zinc, magnesio y bórax en 4 litros de agua, en otro recipiente se diluye la cal en 16 litros de agua y se revuelve con un palo. Luego agregar lentamente la solución del recipiente de los sulfatos en el recipiente de la cal (no al revés), revolver constantemente. Se aplica inmediatamente no se debe guardar. guardar. No aplicar en floración. • Dosis: Para
hortalizas utilizar un litro de caldo por un litro de agua. Para plátano utilizar el caldo visosa puro más m ás melaza al 2% para mejorar la adherencia. Para frutales aplicarlo en concentraciones de 1:1 o sea una parte de caldo mezclado con una parte de agua.
c aldo de cenIZa Es recomendado para varios cultivos. Se recomienda para la antracnosis y la gotera del tomate rotando cada 5 días con caldo bordelés y aplicaciones de súper magro. Materiales.
1 kilo de ceniza cernida o colada 2 litros de agua 100 gramos de jabón azul, nunca fab o jabón en polvo. Preparación:
En un recipiente metálico mezclar el agua, la ceniza y el jabón. Se coloca al fuego durante 20 minutos. Se deja enfriar se cuela y se aplica.
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mIneRal a a base de ZInc c aldo mIneRal
El sulfato de zinc es una mezcla con azufre, muy útil para corregir las deficiencias nutricionales de muchos cultivos con carencia de este nutriente, en especial en citricultura. La deficiencia de este elemento en los naranjales se manifiesta en la forma de manchas cloróticas llamadas foliocelosis. También, este signo puede estar asociado a la falta de calcio en el suelo. Se recomienda hacer corrección del calcio en el suelo, aplicar al follaje el caldo a base de zinc. Materiales
Sulfato de zinc 60 gramos Cal viva o apagada 30 gramos Agua 10 litros Preparación:
En dos litros de agua tibia disolver 60 gramos de sulfato de zinc, en otro recipiente disolver en 8 litros de agua disolver los 30 gramos de cal, disolver constantemente hasta conseguir una mezcla homogénea. Luego en la solución de la cal se vierte el preparado del sulfato de zinc. • Dosis: Se aplica puro sobre la cobertura de los árboles.
c aldo sulfocálcIco (a ZufRe ZufRe + c al ) Este caldo consiste en una mezcla de azufre en polvo y cal que se coloca a hervir en agua durante 45 minutos, formando una combinación llamada polisulfuro de calcio. De esta manera se puede hacer hace r soluble el azufre en agua. El líquido obtenido una vez decantado es de color amarillo anaranjado y contiene cantidades variables de polisulfuro de calcio. Es considerado un excelente fungicida. Materiales
Azufre en polvo 500 gramos Cal viva 250 gramos Agua 2.5 litros. Recipiente metálico
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Preparación:
Colocar el agua a hervir en el balde metálico y cuidar de mantener constantemente el volumen de agua. Cuando el agua esté hirviendo, agregar el azufre simultáneamente con la cal con mucho cuidado, ya que el azufre es inflamable. Revolver constantemente la mezcla con la paleta durante aproximadamente 45 minutos. Mantener constante el volumen del agua del caldo, durante todo el tiempo que hierve la mezcla. El caldo esta listo cuando después de hervir se torna de color vino tinto a color teja de barro o color ladrillo. Se deja reposar r eposar,, se filtra y guarda en envases oscuros o scuros y bien tapados. Se le agrega una cucharada de aceite de cocina para protegerlo de la degradación. Se puede guardar hasta por tres meses en lugares frescos protegidos del sol. El sedimento de color verde amarillento, se constituye en la pasta sulfocálcica, la cual debe homogenizarse y guardarse en recipientes bien cerrados, con un poco de aceite para protegerla de la degradación que puede sufrir. sufrir. La pasta se utiliza para el tratamiento de troncos y ramas de árboles que estén atacados por cochinillas, brocas o taladradores y árboles que hayan sufrido podas. •
Para enfermedades en hortalizas utilizar ½ litro de caldo sulfocálcico en 19.5 litros de agua. Para frutales especialmente para cítricos utilizar 2 litros de caldo en 18 litros de agua. Dosis:
La pasta se utiliza para cicatrización se puede utilizar un kilogramo de pasta sulfocálcica en dos litros de agua. Aplicar directamente sobre las partes afectadas con broca o pincel grueso. bonos bIológIcos a bonos
. Los abonos orgánicos se preparan con los recursos rec ursos de la naturaleza, aportan a la planta los nutrientes que necesita para crecer y presentar una producción aceptable. Hay diferentes clases de abonos orgánicos, algunos son líquidos, otros son sólidos, en la fermentación de estos intervienen diferentes tipos de microorganismos buenos. Un quelato es el resultado de combinar un ligando (sustancias orgánicas) con ciertos cationes metálicos como Calcio (Ca), cobre (Cu), Zinc (Zn), Hierro (Fe), Manganeso (Mn), Boro (B), Molibdeno (Mo), Magnesio (Mg). Los nutrientes aplicados en forma de quelatos son diez veces mas eficientes que aplicados en forma de sales, así las aplicaciones de quelatos por vía foliar gastan de nueve a diez veces menos material y las aplicaciones de quelatos al suelo gastan cinco veces menos material que cuando se usan fuentes meramente minerales. En el compost, actúan como ligandos el ácido húmico y el ácido fúlvico . Al alcance del agricultor están ligandos como jugo de limón, limón, extractos de bosque bosque (real-
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Es absolutamente necesario poner gran cuidado en la dosis y en el pH (acidez o alcalinidad) de los quelatos so pena de causar daño a los cultivos. Las aplicaciones foliares deben hacerse a pH próximo a 6.
c aldos mIcRobIanos Caldo supermagro – elementos menores Agroplus de estiércol de caballo Caldo Agromil Caldo de sulfato de potasio y roca fosfórica Los caldos microbianos, son mezclas de productos orgánicos, algunos minerales especialmente sulfatos, estiércoles de animales y plantas. Son importantes, porque mejoran las condiciones del suelo y estimulan la multiplicación de microorganismos benéficos que ayudan a modificar los nutrientes de manera que sean asimilados fácilmente por las plantas. La principal característica de estos caldos es que en el proceso proc eso de fermentación se produce la quelatación de algunos metales, es decir los componentes químicos de la mezcla. Esto se traduce en distintas ventajas de acuerdo a la manera en que se aplique. Cuando se realiza aplicación edáfica: para que el elemento no se precipite en el suelo; para que el elemento en cuestión sea más asimilable por la planta y para poder agregar una dosis muy grande sin que sea fitotóxico. Cuando se realiza aplicación foliar: para poder agregar una dosis relativamente grande sin que sea fitotóxico y para que no se precipite en el medio extracelular. Materiales
Estiércoles Levadura Fosforita Huila
Sulfatos Calfos
leche Cal Dolomita
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El Calfos, la Cal Dolomita, la Fosforita Huila son materiales importantes en todo proceso de la agricultura orgánica, ya que aportan minerales especialmente Fósforo, Calcio, Magnesio. Además ayudan a que la transformación de nutrientes, y a corregir la acidez del fermentado o compostaje mejorando el pH. En la preparación de los caldos microbianos es muy importante la oxigenación cuando son aeróbicos, la entrada de oxígeno se logra agitando diariamente el caldo microbiano, para generar turbulencia se recomienda realizar tres vueltas al lado izquierdo y tres vueltas al lado derecho, esto permite que el oxígeno del aire penetre en el recipiente, igualmente es sustrato se distribuye homogéneamente el recipiente. Los caldos microbianos deben ser aplicados en la horas de la tarde o bien temprano en la mañana, el suelo debe estar húmedo, para que los nutrientes sean aprovechados eficientemente, igualmente se puede generar estrés en las plantas por concentración de minerales.
c aldo supeRmagRo - elementos menoRes Materiales
200 60 12 1 1 1 1 1/2 1/2 1/2 1/2 1 10 1 9 1
Litros de agua Kilo Kiloss de de est estié iérc rcol ol fres fresco co Kilos de melaza Kilo de cal viva Kil Kilo de de sul sulffato ato de de cob cobre re Kilo Kilo de sulf sulfat atoo de de mag magne nesisioo Kil Kilo de de sul sulffato ato de de zizinc Kilo Kilo de sul sulfa fato to de de mang mangan anes esoo Kilo Kilo de sulf sulfat atoo de de hie hierr rroo Kilo de bórax Litr Litros os de lech lechee (en (en polv polvo) o) Kil Kilo de de sal sal min mineral eraliz izad adaa Canecas de de 50 50 lilitros Caneca de de 20 200 lilitros ros
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se cuela (filtrar), el caldo microbiano micro biano está listo para ser aplicado. La duración del caldo es de aproximadamente 2 a 3 meses conservado en lugares frescos. • Dosis: De 2 a 4 litros por 100 litros de agua.
La dosis mas usada para hortalizas es medio litro de caldo microbiano por bomba de 20 litros es decir medio litro de caldo + 19.5 litros de agua; para frutales se usan 2 litros litro s de caldo para bomba de 20 litros es decir 2 litros de caldo + 18 litros de agua. Usos: Se recomienda aplicación foliar y al suelo. Frecuenciadeaplicación: Para hortalizas aplicar cada 20 días y para frutales cada mes.
Aplicarlos con co n suelo húmedo, en horas de la mañana o en las horas de la tarde. Se debe aplicar espaciadamente, ya que contiene elementos menores y aplicaciones muy frecuentes pueden causar toxicidad.
c aldo de sulfato de potasIo y y Roca Roca fosfóRIca fosfóRIca Este caldo es necesario para corregir deficiencias de potasio y fósforo. Las aplicaciones deben ser dirigidas al suelo al momento de la siembra a los 15, 35 y 60 días después de germinado el cultivo, si los suelos son muy deficientes en fósforo y potasio es posible que se requieren mas aplicaciones. Materiales
12 4 1 y medi mediaa Media Media 1
Litros de agua Kilo Kiloss de esti estiér érco coll fres fresco co libr libraa de de mel melaz azaa Libra sulfato de potasio Libra Roca fosfórica Litr Litroo de de lec leche he o sue suero ro
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Agregar medio litro de leche o suero a cada caneca. Mezclar. Mezclar. Agregar a cada caneca 4 litros de agua más. Agitar diariamente con un palo, a los 8 días el caldo c aldo microbiano está listo para ser aplicado. Mezcle en un balde o caneca grande el contenido de las dos canecas, Cuele muy bien para aplicación foliar. foliar. Los residuos de las canecas o del colado pueden aplicarse a los árboles frutales en el área de influencia de las raíces o agregarse a las pilas del compost. Duración máxima 2 meses siendo conservado en lugares frescos. • Dosis: 10 litros por 90 litros de agua. Para aplicación foliar utilizar 2 litros por bomba
de 20 litros (2 de caldo y 18 litros de agua) Para aplicación al suelo utilizar 5 litros de caldo y 15 litros de agua. Aplicar por cada planta aproximadamente 25 - 30 mililitros
Usos: Se puede utilizar en todos los cultivos, también cuando se presenten deficiencias de
fósforo y potasio, en prefloración y en el llenado del fruto. Aplicación: foliar y al suelo.
métodos de obtencIón de los extRactos De a cuerdo a lo que se quiera obtener de la planta se pueden realizar diferentes métodos de extracción como los que se muestran a continuación. • Purinesfermentados o enfermentación, es
•
cuando se coloca la planta en un saco, dentro de un recipiente con agua. Se le cierra para que no entren organismos contaminantes y se agita diariamente para permitir la aireación. Son fermentados cuando se aplican pasadas dos semanas de iniciado el proceso de fabricación del purín o en fermentación si se aplica al transcurrir cuatro días (6). maceración, es colocar el material vegetal fragmentado o partido en partes peLa maceración, queñas, en contacto con el solvente (agua) durante dos a siete días. Esto se coloca en un lugar aislado de la luz. El agua arrastra los compuestos medicinales de los vegetales y se ve favorecido al colocar el material vegetal en partes pequeñas (2).
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• Late atem mpera perattura. ura. La infusión o el cocimiento a una temperatura cercana a los 100ºC
• • •
favorece la extracción. No obstante, a veces conviene hacer la extracción con agua fría, ya que puede interesar no extraer determinados principios activos que solamente pasarían al agua con la ayuda del calor El tiempo. La duración del contacto de la planta con el agua. El método empleado para la extracción. Elgrad Elgradodep odepulv ulveri erizac zación ióndela delaplan planta. ta. Aumenta la extracción cuanto más troceada esté la planta, pero hasta ciertos límites a partir de los cuales pueden originarse una serie de procesos físicos que dificulten el proceso. Por otro lado, las plantas pulverizadas pueden traer otra serie de problemas.
La elección de la planta y un método de extracción que permita obtener la mayor can tidad de compuesto de una planta son el éxito en la realización del extracto.
t abajal 4 Se utiliza para controlar cucarroncitos, comedores de las hojas, gusano cogollero, trips, arañita roja y mosca del botón floral del maracuyá y la granadilla. Materiales
150 gramos de hojas de tabaco, 50 gramos (1/4 de barra) de jabón coco o rey 350 ml (cc) de alcohol Preparación
Se deja en remojo el tabaco desmenuzado con el alcohol y un litro de agua en un recipien te de boca ancha anch a y con tapa por espacio de tres días. Transcurrido Transcurrido este tiempo se cuela y
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puRín de ajo Este preparado se utiliza para controlar enfermedades de las plantas, especialmente las producidas por hongos. Fortifica los cultivos y a la vez previene y repele algunos insectos especialmente en tomate, papa, lulo y fríjol. Materiales
500 1 2 100 20
gramos de ajos, barra de jabón de coco, hojas de sábila cristales, gramos de ají pique litros de agua
Preparación
Se trituran los dientes de ajo y se dejan en remojo durante 2 días en 5 litros de agua. El ají se muele y se deja fermentar por 2 días por separado en 5 litros de agua. Se cuelan, el día de la fumigación se mezclan. Se agregan un litro de agua por litro de purin. Para bomba de 20 litros se utiliza 10 litros de purin por 10 litros de agua, se agrega el cristal de sábila rallado o licuado y el jabón disuelto a medida que se va revolviendo (50 gramos por bomba de 20 litros).
• Dosis:
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Bibliografía
Aida T. Rodríguez, Daysi Morales y M. A. Ramírez. 2000. Efecto de extractos
activity of Melia azedarach fruit fruit extract. Fitoterapia, Volume 70, Number 3, pp. 296-298(3)
vegetales sobre el crecimiento In vitro de hongos fitopatógenos. Cultivos Tropicales Tropicales Cadena Frutícola del Huila, Secretaría Técnica. 2006. Manual Técnico del cultivo de 21(2):79-82, 2000 Passiflora edulis L) en el departa Alcala, D.; D.; Vargas, Vargas, N. y Pire, A. 2005. Efecto maracuyá ( Passiflora de extractos vegetales y fungicidas sintéticos mento del Huila. Neiva. 32 p. sobre el crecimiento micelial in vitro de Scle- CCI. 2003. Inteligencia de mercados No. 19. rotium rolfsii y Thielaviopsis basicota. Rev. Fac. MADR-CCI. En http://www.cci.org.co/ Agron. (Luz) (Luz).. 2005, 22: 315-323 315-323 Manual%20del%20Exportador/Frutas/ Becerra, D. 2005. Efecto del origen del material Granadilla/ granadilla02.htm. vegeta vegetall y la edad sobre sobre la capacid capacidad ad mormor- Christensen, J.J., Daly, J. M. 1951. Adaptation fológica de dos especies de pasifloráceas in fungi. Annu. Rev. Phytopathol. 5: 57-70. cultivadas in vitro. Pontificia Universidad Jav- Curso: Principios básicos de agricultura orgánieriana. Facultad de Ciencias. Cundinamarca. ca; (s. a.). Capítulo 6. Abonos fermentados Bogota. Colombia. 177 p. Corregir la fecha (caldos microbianos). http://www.mailxBejarano, C. y Restrepo, J. 2002. Abonos ormail.com/curso/vida/agriculturaorganigánicos, fermentados tipo bocashi, caldos ca/capitulo6.htm minerales y biofertilizantes. Corporación Au- Cruz, C. 2007. Estandarización del proceso de tónoma Regional Del Valle Del Cauca CVC, producción masiva del hongo Trichoderma Subdirección de Patrimonio Ambiental prokoningii Th Th 003 mediante fermentación fermentación bi-
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Guillén, A. 2008. Azufres de uso agrícola (fungicidas). En línea. Consultada el 3 de abril de 2008. Disponible en: http://www.monografias.com/trabajos11/azufragr/azufragr.shtml. Hernandez, A. y Bernal, R 2000. Lista de Especies de Passifloraceae de Colombia. Biota Colombiana 1 (3):320-335.
Jass Jassoo de Rodr Rodríg íguez uez,, D.; D.; Hernánd Hernándezez-Cas Castil tillo, lo, D.; Rodríguez-García R. y Angulo-Sánchez, J. L. 2005. Antifungal activity in vitro of Aloe Aloe vera vera pulp and liquid fraction against plant
pathogenic fungi. Industrial Crops and Products 21 81–87
Rivera, H. F.; F.; Pastrana Trujillo, Trujill o, A. F.; Figueroa Gasca, R. H. 2006. Inventario frutícola del departamento del Huila. Uni versidad Surcolombiana, Surcolombiana, Facultad Facultad de Ingeniería, Grupo de Investigación de Agroindustria, Secretaria de Agricultura. 154p.
Rodríguez, A. Morales, D. y Ramírez M. 2000. Efecto de extractos vegetales sobre el crecimiento In Vitro de hongos fitopatógenos. Cultivos Tropicales 21(2):79-82.
Rosca-Casian, O.; Parvu, M.; Vlase, L. y Tamas, Tamas, M. 2007. Antifungal activity of Aloe vera leaves. leaves. Fitoterapia 78: 219–222
Kumar, R.; Mishra, A. K.; Dubey, N. K. y Roselló, J y Oltra. Extractos Naturales Utiliza Tripathi, Tripathi, Y. Y. B. 2007. Evaluation of Cheno- dos En Agricultura Ecológica. En español. podium ambrosioides oil as a potential source
of antifungal, antiaflatoxigenic and antioxidant activity. International Journal of Food Microbiology 115: 159–164. Larkin, R y Fravel, D. Efficacy of Various Fungal and Bacterial Biocontrol Organisms for Control of Fusarium Wilt of Tomato. Plant Disease. Vol. 82 No. 9: 1022-1028. Malavolta, E. 2002. Fertilización del maracuyá en: Nutricion y fertilizacion del maracuyá. Internacional Plant Nutricion Institute 5159 pp.
Disponible en: http://www.gobiernodecanarias.org/agricultura/icca/jornadas/ cursoAE/1820.pdf
Ruphael, Y., Cardarelli, M. T., Rea, E. y Coll, G. 2008. Grafting of cucumber as a means to minimize copper toxicity. Environmental and Experimental Botany. V 63 (2008). Pp 49–58
Schilling. A. G., Möller. E. M., Geiger. H. H. 1996. Polymerase chain reaction-based assays for specific detection of Fusarium culmorum, F. graminearum, and F. avenaceum. Phytopathology 86: 515-522.
Mares, D.; Tosi, B.; Poli, F.; Andreotti, E. y Romagnoli, C. 2004. Antifungal ac- Trindade, M. M . B.; B. ; Lopes, Lop es, J. L.; Soares-CosSoares- Cos-
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GOBERNACION DEL HUILA DEPARTAMENTO ADMINISTRATIVO DE PLANEACION CONSEJO DEPARTAMENTAL DE CIENCIA Y TECNOLOGÍACODECYT
Contribuir al uso racional y sostenible de los agroecosistemas debe ser un compromiso asumido por todos. De nuestra voluntad depende que las futuras generaciones tengan un mundo sano, lleno ll eno de posibilidades para vivir vivir..
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