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Showing items 1 through 9 of 623.
  1. Library Resource
    Journal Articles & Books
    December, 1985
    Colombia, Central America, South America

    The factors influencing the size and shape of exptl. field plots (area of exptl. lot, soil types, trial objective, no. of replicates, and degree of accuracy and homogeneity of the exptl. material) for the execution of field expt. are discussed. The basic principles of the following different methods to determine plot size are described: max. curve method, method of Koch and Rigney, Hatheway's method, and the max. curve method using the multiple linear regression model. Some considerations are presented on the border effect and on plot size in bush and climbing bean trials.

  2. Library Resource
    Journal Articles & Books
    December, 2017
    Peru, Central America, South America

    Nuestra especie entró en grupos pequeños al continente americano a través de Beringia hace 20-15 000 años. Compartió con Siberia Oriental el chamanismo y con él la búsqueda de plantas y hongos alucinógenos y, como consecuencia, el conocimiento detallado de la flora y el continuo interés por experimentar. Al entrar en el interior del continente americano, nuestra especie contribuyó –por la caza continua– a la extinción de su megafauna.

  3. Library Resource
    Journal Articles & Books
    December, 2010

    Rice-fish farming: A food security alternative Rice-fish farming is a biological or clean production system that consists of the simultaneous farming of rice and fish on the same land and at the same time; in other words, in the plots flooded for rice cultivation. Rice is the main product and has greater economic importance, whereas the fish is both a source of additional income and a protein supplement that improves the nutritional quality of farmers’ diets.

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