Aponte-Zayas, Alfredo

Profile Picture

Filters

20111
Reset filters

Settings

Citations

Publication Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Efecto de la edad fenológica en la calidad y producción de biomasas de lineas se soya forrajear [Glycine Max L. (Merr) en un oxisol de Puerto Rico
    (2011) Aponte-Zayas, Alfredo; Valencia-Chin, Elide; College of Agricultural Sciences; Beaver, James; Román Paoli, Elvin; Ramos Santana, Rafael; O'Farrill Nieves, Hipólito; Department of Crops and Agro-Environmental Sciences; Aponte Colon, Aníbal J.
    Forage soybean [Glycine max L. (Merr.)] is a crop with high potential for biomass production in the tropics, because, in a short period of time high quality hay can be produced for animal feed. However, no soybean cultivar has been developed, tested and released in Puerto Rico for soybean forage or grain. Also, there is limited information of the effects of planting dates and crop harvest phenological stages (CHPS) on dry matter yield (DMY). The objective of this study was to evaluate biomass production (kg/ha), nutritional value [% crude protein (CP)], % neutral detergent fiber (NDF), and acid detergent fiber (ADF)] of 10 forage soybean lines at two CHPS and two planting dates on an Oxisol (Cotito series) of the Isabela Agricultural Experiment Station. The experimental design was a complete block with four replications. There was a split-plot arrangement of 10 forage soybean lines and two CHPS (R2 and R5.4); 100 % flowering and 75% grain physiological filling, respectively). The two planting dates were September 2010 and January 2011. For each planting date and CHPS, a 0.60-m2 area was harvested from the main plot. A fresh weight and a sub-sample (500g) was taken. Subsamples were dried in an oven to calculate % dry matter (DM). Nitrogen % (Kjeldhal), NDF and ADF (Van Soest procedure) were determined in a commercial laboratory. The data was analyzed using the Statistical Package, INFOSTAT. Unlike planting date, CHPS had a significant effect (P <0.05) on the DMY. Soybean forage DM produced on average between 5,436 and 6,486 kg/ha when harvested at the R2 (8 weeks) and R5.4 (12 weeks) stages of development, respectively. The maximum yield of biomass was obtained at the R5.4 harvest with an increase in DM of 1,000 kg/ha in 28 days. There was a significant interaction (P<0.05) between the lines x CHPS for nutritional value. Crude protein ranged from 29.6% to 33.6% for R2 harvest, while samples from the R5.4 harvest ranged from 23.0% to 26.7For fiber, NDF in R2 harvest samples averaged from 33.3% to 34.6%, and increased in the R5.4 harvest from 38.1% to 44.8%, while ADF for R2 levels ranged from 21.0% to 25.6%, whereas ADF increased from 26.2% to 33.2% for the R5.4 harvest. There was also a significant difference (P<0.05) between lines for seed production. Six lines (6, 72, 1, 50, 110 y 2) produced seed yields > 1,000 kg/ha. These results indicate that the DM yield of soybean lines did not differ (P>0.05) between planting date, but there was a marked effect of the CHPS on DM yield. Forage soybeans harvested at the R5.4 versus the R2 stage of development had 60% more biomass, and higher nutritional value. These values were similar to alfalfa and can satisfy the nutritional requirement of ruminants.