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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal Article

Methods to break seed dormancy of Rhynchosia capitata, a summer annual weed  [2011]

Ali, Hafiz Haider; Tanveer, Asif; Nadeem, Muhammad Ather; Asghar, Hafiz Naeem;

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Dormancy of weed seeds is a significant feature contributing to their survival rate since it helps the weeds to avoid herbicides and other weeding practices along with unfavorable environmental conditions. We investigated the effects of different dormancy breaking treatments on the germination of Rhynchosia capitata, a common summer annual weed, which is emerging as a weed threat in Pakistan. Seeds were soaked in thiourea, KNO3, HCl, HNO3, and H2SO4, and they were also mechanically scarified (sandpaper). Results indicated that R. capitata seeds show signs of physical dormancy that is mainly due to the impermeability of their coat. Mechanical scarification and acid scarification (soaking of seeds in H2SO4 for 60 and 80 min and in HCl for 12 and 15 h) were very efficient in breaking dormancy and promoting germination. Seed soaking in HNO3 for 1 to 5 d showed little effect whereas various concentrations of thiourea and KNO3 were ineffective in breaking R. capitata seed dormancy.

From the journal

Chilean journal of agricultural research
ISSN : 0718-5839

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2018
Volume:
71
Issue:
3
Extent:
483-487
All titles:
"Methods to break seed dormancy of Rhynchosia capitata, a summer annual weed"@eng
Other:
"Summary in Spanish."
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2018
Volume:
71
Issue:
3
Extent:
483-487
All titles:
"Methods to break seed dormancy of Rhynchosia capitata, a summer annual weed"@eng
Other:
"Summary in Spanish."