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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen distribution in hybrid and local corn varieties and its possible relationship to a declining soil nitrogen pool under shifting agriculture at Indian Church, Belize (1982)
    Springer
    Plant and soil 67 (1982), S. 119-127 
    Details
    ISSN: 1573-5036
    Keywords: Belize ; Corn ; N-allocation ; N-cycling ; P-allocation ; Traditional agriculture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumen Se determinaron los niveles de nitrógeno en maiz local, híbrido y malezas durante tres años. Las pérdidas de nitrógeno por cosecha del grano fueron 45% del nitrógeno total asimilado por la milpa. Los porcentajes de N y P en el híbrido y en el maiz negro local fueron también determinados observándose tasas de absorción sigmoidales en las raices y hojas de ambas variedades hasta alcanzar el periodo reproductivo. Luego el porcentaje de estos nutrimentos bajó rápidamente en las hojas. Los niveles en las semillas maduras en el híbrido bajaron a 78% y 52% de los valores iniciales de N y P respectivamente. mientras que en la variedad local éstos bajaron a 58% y 50% respectivamente. El maiz híbrido no se consideró apropiado para los campesinos locales debido al alto porcentaje de nitrógeno total extraido por la cosecha además de la suceptibilidad del grano cosechado a las plagas durante el almacenamiento.
    Notes: Abstract Nitrogen levels at harvest in hybrid corn and weeds were determined over a three year period. Nitrogen losses due to grain removal accounted for 45% of all assimilated-N in the milpa. Percent N and percent P levels in the hybrid and a local black corn were also determined. Uptake of nitrogen and phosphorus in roots and leaves of both varieties were sigmoid until reproductive growth was initiated, at which time the percentage of both nutrients in the leaves declined rapidly. Levels in the seed at maturity in the hybrid variety accounted for 78% N and 52% P; levels were 58% N and 50% P in the local corn. Hybrid corn was not considered suitable for local farmers because a high percentage of total-N was removed at harvest and the hybrid had a high susceptibility to weevil attack.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182760
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen cycling in the seasonally dry forest zone of Belize, Central America (1982)
    Springer
    Plant and soil 67 (1982), S. 333-342 
    Details
    ISSN: 1573-5036
    Keywords: Agriculture ; Belize ; Cohune palm ; Dry forest ; Fallow ; Hardwood ; Litter ; N-cycling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumen Dos asociaciones boscosas (Palma Cohune y Matorral Alto) se estudiaron en relación a sus reservas y flujos de nutrimentos y sus posibilidades de aprovechamiento agricola. Se siguió la evolución del nitrógeno en el suelo y en la caida de hojarasca durante un año obteniéndose asi información sobre los procesos pedogenéticos en el barbecho del bosque. A través de muestreos destructivos se encontró que en la biomasa del bosque de Palma Cohune habían 690 kg N ha−1 y en el Matorral Alto solo 203 kg N ha−1. La biomasa de hojarasca era excepcionalmente alta en Palma Cohune alcanzando un valor de 497 kg materia seca ha−1; en el bosque de Matorral Alto la hojarasca era de 65 kg materia seca ha−1. Esto probablemente se deba a la baja velocidad de descomposición en el caso de la palma. Las reservas sustanciales encontradas en ambos barbechos para el nitrógeno podrían ser parcialmente utilizadas para la producción agrícola campesina.
    Notes: Abstract Two forest associations, cohune palm (Cohune Ridge) and mixed tropical hardwood (High Bush), were assessed on the basis of nutrient movement and storage for their suitability for agriculture. Continuous monitoring of soil nitrogen and leaf litterfall over a one-year period provided information on soil building processes in the forest fallow. Destructive cuts revealed the storage of 690 kg N ha−1 in the standing biomass of the Cohune forest versus 203 kg N ha−1 in the High Bush. Litter biomass was exceptionally high in the Cohune Ridge (497 kg ha−1 dry matter) as compared to the High Bush (65 kg ha−1 dry matter) and other tropical forests. This is probably because of a low rate of decomposition in the Cohune Ridge palm forest. A substantial reserve of nitrogen is present in both forests' fallows, and this can in part be harvested by the small farmer for crop production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182780
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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