Effect of sowing dates and nitrogen levels for ethanol production from sweet sorghum stalks and grains

Abstract

Sweet sorghum is being investigated as a feedstock for ethanol production in semi-arid countries. It can be grown with fewer inputs than other energy crops. In Iran, due to long growing season, ethanol is produced from both sweet sorghum stem and grain. In other countries, ethanol is not produced from sweet sorghum grain due to low grain yield or short growing season. The purpose of this study was to maximize ethanol production from both stem and grain of sweet sorghum. Four planting dates (July 5, July 14, July 25 and August 4) and three nitrogen levels (50, 100 and 150 kg/ha urea) were assigned to the main and subplots, respectively. Plants were harvested at physiological maturity. Stem measurements were: stalk height, stalk diameter, stalk fresh yield, brix value, sucrose content, total sugar and ethanol yield and grain measurements were: number of grain per panicle, 1000 grain weight, grain yield, biological yield, harvest index and ethanol yield. Stem measurements were highest in July 5 planting and lowest in August 4 planting, while grain measurements were highest and lowest in August 4 and July 5 plantings, respectively. Stem and grain measurements in July 15 and July 25 were intermediate. More grain yield, 1000 grain weight and number of grain/panicle were obtained with the application of 150 kg/ha urea than the other two nitrogen levels. Based on the results, in order to obtain the highest ethanol yield from both stem and grain, it is suggested to plant sweet sorghum as early as possible and apply 150 kg/ha urea.

Comparative response of sorghum genotypes to varied levels of nitrogen in rice-fallows of North Coastal Region of Andhra Pradesh

“…These attributes have bestowed higher number of leaves per plant. Similar results were found by Abbas et al (2016) and Dixit et al (2005) where number of leaves per plant had significantly -1 increased by nitrogen levels from 40 to 180 kg N ha .…”

Variation in biochemical attributes and rust reaction in response to crop geometry in mono-picking garden pea for mechanical harvesting

“…The maximum total sugar (19.70%) was observed in 20 th October sown crop which was significantly higher than 5 th November sown crop. The findings were in close conformity with those of Almodares and Hoseini (2016) in sweet sorghum, as they reported that timely sown crop gave higher total sugar content as compared to late sown. It was observed that the spacing of 20 × 10 cm significantly affects the total sugar content and spacing of 20 × 7.5 cm and 20 × 5 cm were statistically at par with each other.…”

Effects of Planting Dates on Growth, Yield And Quality of Newly Released Sugarcane Varieties

“…Sanghera et al (2016)reported that planting from 15th October to 30th October resulted in low pol (%) cane while 15 November planting showed promising results for enhancement of pol (%) cane. Abbas and Hossan (2015)observed that pol decreased from 12% to 6.71 % by delay in planting. Almodares and Darany (2006) also stated that higher pol (%) cane was recorded in early plantings.…”