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Brassica cover crops for biological ...

Holtz, Guilherme Pimentel.

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Brassica cover crops for biological weed control in no-tillage.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Brassica cover crops for biological weed control in no-tillage./
Author:	Holtz, Guilherme Pimentel.
Description:	97 p.
Notes:	Adviser: Warren A. Dick.
Contained By:	Dissertation Abstracts International62-08B.
Subject:	Agriculture, Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3022501
ISBN:	9780493340791

Brassica cover crops for biological weed control in no-tillage.
Holtz, Guilherme Pimentel.

Brassica cover crops for biological weed control in no-tillage. - 97 p.

Adviser: Warren A. Dick.

Thesis (Ph.D.)--The Ohio State University, 2001.

Rape "Humus" aqueous extracts reduced seed germination by allelopathy. Living rape was more efficient for weed control than soil incorporated rape. "Humus" was the best Brassica cultivar for weed control in no-tillage.

ISBN: 9780493340791Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Brassica cover crops for biological weed control in no-tillage.
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020 $a 9780493340791
035 $a (UMI)AAI3022501
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100 1 $a Holtz, Guilherme Pimentel. $3 1271223
245 1 0 $a Brassica cover crops for biological weed control in no-tillage.
300 $a 97 p.
500 $a Adviser: Warren A. Dick.
500 $a Source: Dissertation Abstracts International, Volume: 62-08, Section: B, page: 3437.
502 $a Thesis (Ph.D.)--The Ohio State University, 2001.
520 $a Rape "Humus" aqueous extracts reduced seed germination by allelopathy. Living rape was more efficient for weed control than soil incorporated rape. "Humus" was the best Brassica cultivar for weed control in no-tillage.
520 $a Brassicas have high content of glucosinolates and can be used as cover crops for weed control reducing herbicide use in no-tillage. Seed germination assays were conducted in petri dishes to study allelopathic effects of rape (Brassica napus cv. "Humus") extracts on lettuce (Lactuca sativa), redroot pigweed ( Amaranthus retroflexus) and green foxtail (Setaria viridis ). Freeze-dried rape shoot and root were extracted in water at 0 to 5% (w/v) concentrations. Increasing ITC (positive control) and rape extract concentrations reduced lettuce, pigweed and foxtail seed germination. The highest inhibition (only 100%) occurred at the 5% extraction rate. Root extract at 5% showed lettuce seed germination inhibition activity equivalent to 2.6 mM ITC.
520 $a Lettuce and "Humus" were planted together in pots at densities of 0 to 100% of total plants. Increasing rape density reduced lettuce biomass production with maximum reduction being 85% at rape density of 75%. Pigweed and foxtail were planted in pots previously grown to rape and lettuce for 40 and 90 days. Weed yield was reduced by as much as 80% when the density of rape in the pot prior to planting pigweed and foxtail was 100%. Previously untreated soil was also amended with freeze-dried rape at rates from 0 to 10 g/kg. Increasing rates of rape reduced plant biomass production by up to 80%. The use of living rape cover crop was 36 times more efficient than a one-time application of rape amendment.
520 $a Rape and mustard (Brassica nigra) cultivars were planted in the autumn of 1999 and 2000 in no-tillage fields in Wooster, OH. Pigweed and foxtail seeds were planted the next spring in the same plots to evaluate cover crop ability to control weeds. "Humus" produced biomass of 5 Mg/ha and was the best cultivar for weed control reducing foxtail biomass production by 98%. Winter rapes "Ceres" and "D. Essex" produced larger biomass when planted in August than when planted in September.
590 $a School code: 0168.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Environmental Sciences. $3 676987
690 $a 0285
690 $a 0481
690 $a 0768
710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 62-08B.
790 $a 0168
790 1 0 $a Dick, Warren A., $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3022501