Growth and yield responses of sweet sorghum (Sorghum bicolor L.) to moisture regimes and nutrient sources
2009
Beebout, J.T. | Zamora, O.B. | Mendoza, T.C., Philippines Univ. Los Baños College, Laguna (Philippines). Crop Science Cluster
The study evaluated the effects of moisture regime and nutrient source on crop growth, grain and juice yield and sugar content of sweet sorghum. Field and greenhouse experiments were conducted in Los Baños, [Laguna] Philippines from March to September 2008. An experiment with moist, medium, and dry moisture regimes resulted in significant differences in stem length, leaf number, photosynthesis rate, stalk and juice weight, and stem and juice brix. The moist water regime increased crop growth, photosynthesis rate and stalk and juice weight while the dry water regime increased brix in the stalk. There were no significant differences in juice brix among moisture regimes. Nutrient sources in the field experiments were inorganic at 60:40:40 NPK; carabao manure and rice straw at 7 t/ha and 0.5 t/ha, respectively; and control with no fertilizer applied. Inorganic fertilizer resulted in increased crop growth, stalk and juice yield, and theoretical ethanol yield compared to the organic fertilizer. Juice brix was not affected by nutrient source. Grain, juice and estimated ethanol yields were 2.7 t/ha, 18.5 t/ha, and 436.9 t/ha, respectively, in plots where inorganic fertilizer was applied.
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