Effects of Nitrogen Application on Sweet Sorghum (Sorghum bicolor (L.) Moench) in the Semi-Arid Tropical Zone of India

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
47-01-08.pdf356.85 KB

Sweet sorghum is a multipurpose crop that has great potential as a bioethanol crop. To make an appreciable profit from cultivating sweet sorghum in the semi-arid tropics (SAT), such agronomic practices as nutrient management need to be standardized. The objective of this study is to determine optimum nitrogen (N) rates for maximizing the grain and sugar yields of sweet sorghum during the rainy season in the Indian SAT. During the 2009 and 2010 seasons, the response of sweet sorghum being grown in an Alfisol to the application of six N rates (0, 30, 60, 90, 120, and 150 kg N ha-1) was evaluated in Patancheru, Andhra Pradesh, India. The chlorophyll content (SPAD reading), cane fresh weight, and grain dry weight increased significantly in line with higher N rates. The volume of juice also increased significantly, although sugar content (brix reading) did not change in line with higher N rates, consequently resulting in a significant increase in sugar yield as computed from the volume of juice and sugar content. There were smaller differences due to N application during the season when soil fertility was at a medium level under high air temperature. Net income, as estimated from cane fresh weight and grain dry weight, increased at rates up to 90 kg N ha-1, and higher N rates did not significantly affect productivity or income, but instead caused severe lodging in 150 kg N ha-1 at the harvest stage. Based on these results, an input of 90-120 kg N ha-1 could be recommended for maximizing sweet sorghum productivity and farmers′ income in the SAT region of India.

作成者 UCHINO Hiroshi WATANABE Takeshi RAMU Karri SAHRAWAT Kanwar L. MARIMUTHU Subramanian WANI Suhas P. ITO Osamu

Fertilizer management

grain yield

SPAD reading

sugar yield

公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 65
終了ページ 73
DOI 10.6090/jarq.47.65
権利 Japan International Research Center for Agricultural Sciences
言語 eng