Integrated R and D program on biofuels: subprogram on utilization of sweet sorghum and cassava as feedstock for ethanol production; Project 3.1: development of production technology protocol for sweet sorghum
2008
Angeles, D.E.
The objectives of this study are the following: a.) to establish the appropriate time of planting sweet sorghum in different growing environments; b.) to evaluate th performance of sweet sorghum varieties in different growing environments; c.) to determine the optimum planting density for different varieties of sweet sorghum; d.) to establish the relationships between tissue nutrient concentration and yield in sweet sorghum, and e.) to determine the fertilizer requirements of sweet sorghum. Results showed that: 1. Planting of sweet sorghum (regardless of variety) at a distance of 75cm x 6.3cm at a population density of 211,640 plants per hectare significantly gave the highest plant stand (208.50 plants per plot), stripped stalk yield; juice yield, juice volume and TSS [total soluble solids] content of 12.9 deg Brix. Sweet sorghum variety SPV 422 exhibited rapid growth. However, variety NTJ2 gave the highest yield and TSS value (10.69 deg Brix to 12.10 deg Brix). ICSV 700 has the highest TSS value (14.23 deg Brix to 15.67 deg Brix). 2. Detopping increased stalk yield, but significantly reduced stripped stalk yield, juice yield, juice volume, grain yield, seed weight and extend the number of days to physiological maturity. 3. Application of 90 kg nitrogen per hectare at a constant rate of 60 kg phosphate and potassium significantly improved plant growth in terms of stripped stalk yield and grain yield of SPV422 variety; and 4. application of NPK at the rate of 90-60-60 kg/ha improved the growth and yield of SPV422. Tissue analysis of crops should be conducted to determine the critical nutrient levels for sweet sorghum
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