dc.contributor.author	Detoni, Cezar Ernesto	en
dc.contributor.committeechair	Abaye, Azenegashe Ozzie	en
dc.contributor.committeecochair	Parrish, David J.	en
dc.contributor.committeemember	Wolf, Dale D.	en
dc.contributor.committeemember	Brann, Daniel E.	en
dc.contributor.committeemember	Welbaum, Gregory E.	en
dc.contributor.department	Crop and Soil Environmental Sciences	en
dc.date.accessioned	2014-03-14T20:22:21Z	en
dc.date.adate	1997-08-05	en
dc.date.available	2014-03-14T20:22:21Z	en
dc.date.issued	1997-06-30	en
dc.date.rdate	1997-08-05	en
dc.date.sdate	1997-06-30	en
dc.description.abstract	Poor emergence of sorghum [(Sorghum bicolor (L) Moench] affects the stand and potential yields. The major objective of this research was to find correlations among field emergence data and laboratory seed vigor tests. Thirty-two and 30 hybrids of sorghum were planted at three Virginia locations in 1995 and 1996, respectively. Field emergence was subsequently compared with results from laboratory tests that included: 1) standard germination; 2) osmotic-stress using polyethylene glycol 8000 (mw); 3) heat-shock using 2 hr at 50°C stress; 4) electrical conductivity of steep water of germinating seeds; and 5) seed mass. Field emergence of grain sorghum differed among hybrids, years and locations. Mean emergence across years and locations was 67.5%, whereas mean germination in the laboratory was 87.8%. There were interaction between hybrid and location and between hybrid and year. Germination under optimal conditions (standard germination test) and with osmotic or heat-shock stress differed among hybrids. Regression analyses showed a weak correlation between laboratory germination (with or without stress) and field emergence in both years. The fresh weight of seedlings whether from standard germination or stress tests also differed among hybrids in both years, and the associations with field emergence were weakly correlated in 1996. Hybrids showed significant differences in radicle length when grown under laboratory stress in both years following standard germination. There was a weak correlation with field emergence and radicle length following heat-shock treatment in 1996. The measurement of electrical conductivity in the seed steep water showed significant differences among hybrids. A weak correlation with field emergence was seen in 1996. Conductivity values per gram of seed and per cm² of seed area revealed differences among hybrids. The correlation of these parameters with field emergence was higher than conductivity per seed. Seed mass varied among hybrids in both years , but was no correlation between seed mass and emergence. Of the laboratory parameters examined, germination proved to be the most consistent predictor of variations in field emergence of sorghum hybrids.	en
dc.description.degree	Ph. D.	en
dc.identifier.other	etd-63197-21517	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-63197-21517/	en
dc.identifier.uri	http://hdl.handle.net/10919/30649	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	TIT.PDF	en
dc.relation.haspart	ABSTRACT.PDF	en
dc.relation.haspart	CHAP1.PDF	en
dc.relation.haspart	CHAP2.PDF	en
dc.relation.haspart	CHAP3.PDF	en
dc.relation.haspart	CHAP4.PDF	en
dc.relation.haspart	CHAP5.PDF	en
dc.relation.haspart	CHAP6.PDF	en
dc.relation.haspart	CHAP7.PDF	en
dc.relation.haspart	CHAP8.PDF	en
dc.relation.haspart	CHAP9.PDF	en
dc.relation.haspart	APPEND.PDF	en
dc.relation.haspart	VITA.PDF	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	seed tests	en
dc.subject	osmotic	en
dc.subject	heat shock	en
dc.subject	electrical conductivity	en
dc.subject	sorghum	en
dc.title	Grain Sorghum Field Emergence and Seed Vigor Tests	en
dc.type	Dissertation	en
thesis.degree.discipline	Crop and Soil Environmental Sciences	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	doctoral	en
thesis.degree.name	Ph. D.	en

Grain Sorghum Field Emergence and Seed Vigor Tests

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