To determine the optimum nutritive solutions for strawberry, Fragaria x ananassa, Duchesne cv. Chandler under a system that uses fine gravel was evaluated two nutritive solutions formulas during vegetative period and three during the fructification period of de plant from December 1996 to August 1997. Destructive samplings were done at 60, 90, 160 and 220 days after treatment to evaluate the growth of the plant, absortion ot nutrients and the reducing sugar content in the fruit. No significant differences were tound between treatments in the vegetative period but there were in the reproductive's for the plant's height, flower and fruit number and percent of reducing sugar of the fruit and its weight. Neither there were significative differences in N, P, K, Ca, Mg and Fe percentages. Combinations of 200:40:300 ppm of NRK in the reproductive period give the best plant yield.

To determine the optimum nutritive solutions for strawberry, Fragaria x ananassa, Duchesne cv. Chandler under a system that uses fine gravel was evaluated two nutritive solutions formulas during vegetative period and three during the fructification period of de plant from December 1996 to August 1997. Destructive samplings were done at 60, 90, 160 and 220 days after treatment to evaluate the growth of the plant, absortion ot nutrients and the reducing sugar content in the fruit. No significant differences were tound between treatments in the vegetative period but there were in the reproductive's for the plant's height, flower and fruit number and percent of reducing sugar of the fruit and its weight. Neither there were significative differences in N, P, K, Ca, Mg and Fe percentages. Combinations of 200:40:300 ppm of NRK in the reproductive period give the best plant yield.

Ismene amancaes “amancay” is a bulbose species typical of the central coast vegetation of Peru called “lomas”. This species sprouts in June during the beginning of the winter-fog period. It has large yellow, aromatic flowers valued for their ornamental value. Our goal was to examine the reproductive development of Ismene amancaes in its natural environment, and we recorded monthly observations during a yearlong study. Observations of the interior of the bulbs allowed recording of the beginning of floral bud formation and development, relating them to leaf formation and edaphic humidity. We found that the first floral buds develop the year before their emergence in December, reaching a maximum number of floral buds in February, during the Summer. Floral bud differentiation starts after leaves that will emerge the following year have developed. This occurs during a period of maximu...

Ismene amancaes “amancay” is a bulbose species typical of the central coast vegetation of Peru called “lomas”. This species sprouts in June during the beginning of the winter-fog period. It has large yellow, aromatic flowers valued for their ornamental value. Our goal was to examine the reproductive development of Ismene amancaes in its natural environment, and we recorded monthly observations during a yearlong study. Observations of the interior of the bulbs allowed recording of the beginning of floral bud formation and development, relating them to leaf formation and edaphic humidity. We found that the first floral buds develop the year before their emergence in December, reaching a maximum number of floral buds in February, during the Summer. Floral bud differentiation starts after leaves that will emerge the following year have developed. This occurs during a period of maximu...

El objetivo de este estudio fue estimar la diversidad y abundancia de invertebrados bentónicos en lagunas altoandinas del Perú y determinar su posible uso como indicadores biológicos. Se muestrearon un total de 16 lagunas, 4 en la cuenca del río Rímac y 12 en la cuenca del Mantaro durante la época seca (junio-octubre 2015). Se determinaron 34 familias, el Phylum Arthropoda obtuvo la mayor riqueza relativa y abundancia relativa de organismos (72.3% y 89.1%), seguidos del Phylum Annelida (12.8% y 4.3%, respectivamente), Mollusca (6.4% y 5.4%, respectivamente) y Platyhelminthes (8.5% y 1.2%, respectivamente). De las 34 familias, la Clase Insecta predominó con 24 familias distribuidas en 6 órdenes, dentro de los cuales el orden Diptera fue más representativa con 7 familias, seguidas del Orden Coleoptera con 5 familias. El análisis de similitud (ANOSIM) mostró que a nivel espacial ...