The combined effect of N fertilization and Rhizobium inoculation on bean (Phaseolus vulgaris L., cv. Bonita) nodulation and yield was studied in the semi-arid southern region of Puerto Rico. Six N treatments: 0, 22, 45, 90, 180 and 360 kg/ha were tested in inoculated and noninoculated plots arranged in a split-plot design with 4 replications. The application of 22 kg/ha of N in the inoculated plots increased plant nodulation 4 and 8 weeks after planting. Higher rates of N fertilization reduced the number and size of bean nodules at both sampling dates. On the other hand, dry beans consistently increased with applications of 0 to 180 kg/ha of N in the presence of Rhizobium.
Una siembra de cebollas de las cultivares Texas Grano 502, White Creole, Dehydrator #4 y el Híbrido F1 Granex 33 se estableció en la Subestación de Fortuna, en el sur de Puerto Rico, el 16 de noviembre de 1979. El Híbrido F1 Granex 33 produjo un excelente rendimiento de 27,686 kg/ha, seguido muy de cerca por Texas Grano 502 (testigo), con 26,953 kg/ha. Las variedades Dehydrator #4 y White Creole produjeron rendimientos muy bajos-13,432 y 12,135 kg/ha, respectivamente. La variedad White Creole arrojó el porcentaje de sólidos totales más elevado; esto es, 17%, seguida por uno excelente, 13.9%, de Dehydrator #4. Las cultivares Texas Grano 502 e Híbrida F1 Granex 33 tuvieron un contenido de sólidos totales de 7.65 y 7.75% en cada caso. El peso medio más alto de bulbos correspondió a la Híbrida F1 Granex 33 seguido por el de Texas Grano 502. Dehydrator #4 y White Creole produjeron bulbos más livianos. White Creole demostró una tendencia marcada a producir bulbos gemelos, lo cual podría ser detrimental si los bulbos se cortan en tajadas para consumo en fresco.
Optimum marketable yields of 5,560, 3,991, and 5,672 kg/ha were obtained when snap bean variety Wade was harvested using the once-over system, at 55 days; Tendergreen at 49 days, and Contender at 47 days, respectively. In the multiple harvesting system, marketable yields of Wade, Tendergreen, and Contender were of the order of 5,381, 3,632, and 6,995 kg/ha in two, three, and two pickings, respectively. Mean differences were not significant. The once-over harvesting system should be preferred because production costs are lower.
Snap bean experimental plantings established seasonally during 1972-73 at Isabela, P.R. demonstrated that the optimal planting season extends from December to March. Variety Contender outyielded Wade in all plantings and showed a tendency to flower twice. This characteristic is not detrimental if the harvest is to be made in several pickings but could be unfavorable if the once-over harvest system is to be adopted.
Una siembra de berenjenas se estableció en la Subestación Experimental de lsabela para evaluar distintos niveles de N, P, K y dos densidades de siembra. Hubo respuesta a N, pero no así a P205 y K2O. Los niveles de N sobre 225 kg/ha aumentaron los rendimientos, pero los aumentos no fueron significativos. No hubo diferencias significativas entre los rendimientos de ambas densidades de siembra. Bajo las condiciones prevalecientes en lsabela 398, 204 y 253 kg/ha de N, P205 y K2O, respectivamente, parecen ser necesarios para un rendimiento máximo de berenjenas.
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