PubAg

Main content area

You searched for: Journal Agronomy journal Remove constraint Journal: Agronomy journal Publication Year 1996 Remove constraint Publication Year: 1996 Source 1996 v.88 no.6 Remove constraint Source: 1996 v.88 no.6
Start Over

Search

24  Search Results

« Previous | 1 - 20 of 24 |
Number of results to display per page

Search Results

1. Allelopathy in cropping systems: foreword

Author:
Nelson, C.J.
Source:
Agronomy journal 1996 v.88 no.6 pp. 853
ISSN:
0002-1962
Subject:
allelopathy; cropping systems; chemical ecology
DOI:
10.2134/agronj1996.00021962003600060002x

2. Allelopathy in forage crop systems

Author:
Miller, D.A.
Source:
Agronomy journal 1996 v.88 no.6 pp. 854-859
ISSN:
0002-1962
Subject:
forage crops; allelopathy; Medicago sativa; phytotoxicity; weeds; allelochemicals; crop rotation
Abstract:
... Secondary plant metabolites and their degradation products are important in all agroecosystems including those with forage crops. Allelopathy affects cropping systems and interseeding of one species into established sods of another. Autotoxicity and heterotoxicity are types of allelopathy. Alfalfa (Medicago sativa L.) has been investigated as both an autotoxic and heterotoxic species. Reestablishm ...
DOI:
10.2134/agronj1996.00021962003600060003x

3. Canopy light reflectance and field greenness to assess nitrogen fertilization and yield maize

Author:
Ma, B.L.; Morrison, M.J.; Dwyer, L.M.
Source:
Agronomy journal 1996 v.88 no.6 pp. 915-920
ISSN:
0002-1962
Subject:
Zea mays; hybrids; nitrogen fertilizers; leaves; leaf area; pigmentation; crop yield; senescence; grains; Ontario
Abstract:
... Assessment of crop N requirements is necessary to develop production systems with optimal N input. A field experiment with six maize (Zea mays L.) hybrids grown at three N fertilizer rates (0, 100, and 200 kg N ha-1) was conducted on a well-drained sandy loam of the Grenville series (coarse-loamy, mixed, mesic Typic Eutrochrepts) on the Central Experimental Farm at Ottawa, ON, in Canada (45 degree ...
DOI:
10.2134/agronj1996.00021962003600060011x

4. Chemistry and mechanisms of allelopathic interactions

Author:
Seigler, D.S.
Source:
Agronomy journal 1996 v.88 no.6 pp. 876-885
ISSN:
0002-1962
Subject:
allelopathy; chemical ecology; plants; plant communities; ecological succession; coevolution; allelochemicals; mechanism of action; secondary metabolites; adaptation; plant competition; bioassays
Abstract:
... Allelopathy, originally defined as chemically elicited interactions between plants or fungi, is mediated by many types of compounds with different sites and modes of biochemical action. Although it is possible to measure a generalized effect, it is unlikely that deeper insight into the basic mechanisms of this phenomenon will be obtained until problems are more clearly and specifically delineated. ...
DOI:
10.2134/agronj1996.00021962003600060006x

5. Cover crops affect sorghum seedling growth

Author:
Dabney, S.M.; Schreiber, J.D.; Rothrock, C.S.; Johnson, J.R.
Source:
Agronomy journal 1996 v.88 no.6 pp. 961-970
ISSN:
0002-1962
Subject:
Sorghum bicolor; cover crops; seedlings; growth retardation; Vicia villosa; Triticum aestivum; Trifolium incarnatum; Trifolium subterraneum; fallow; weeds; crop residues; crop rotation; seed germination; allelopathy
Abstract:
... Recently killed cover crops often interfere with crop seedling growth. Controlled-environment and field studies were conducted to characterize the nature and persistence of cover crop interference with sorghum [Sorghum bicolor (L.) Moench] seedling growth and to test several seed-zone management practices that might alleviate detrimental effects. Germination, root and shoot length, and disease inc ...
DOI:
10.2134/agronj1996.00021962003600060020x

6. Distinguishing resource competition and chemical interference: overcoming the methodological impasse

Author:
Weidenhamer, J.D.
Source:
Agronomy journal 1996 v.88 no.6 pp. 866-875
ISSN:
0002-1962
Subject:
crop-weed competition; weed control; biological control; allelopathy; bioassays; phytotoxicity; chemical ecology; ecology; shrublands; plant competition; allelochemicals; soil analysis; laboratory techniques; Florida
Abstract:
... Understanding allelopthy may bold the key to new weed management strategies. However, the difficulty of distinguishing chemical interference from competition has hindered studies of allelopathy in natural and cultivated plant communities. Experimental rigor has increased, but has yet to provide unambiguous proof of allelopathy. The complexities of allelopathic interactions, as illustrated by ongoi ...
DOI:
10.2134/agronj1996.00021962003600060005x

7. Double-emitter source (DES) for irrigation experiments in salinity and fertilization

Author:
De Malach, Y.; Ben-Asher, J.; Sagih, M.; Alert, A.
Source:
Agronomy journal 1996 v.88 no.6 pp. 987-990
ISSN:
0002-1962
Subject:
irrigation systems; design; microirrigation; research equipment; irrigation water; nutrient solutions; fertilizers; salinity; water quality; saline water
Abstract:
... A double-emitter source (DES) irrigation system was designed, using trickle instead of sprinkler irrigation. Two trickle laterals and their emitters connected to two tanks of stock solutions are coupled together to form a double-joint lateral. The emitters of the two lines have different and varying discharges to obtain various mixings between the two stock solutions while maintaining constant app ...
DOI:
10.2134/agronj1996.00021962003600060024x

8. Evaluation of nitrification inhibitors and urea placement in no-tillage winter wheat

Author:
Rao, S.C.
Source:
Agronomy journal 1996 v.88 no.6 pp. 904-908
ISSN:
0002-1962
Subject:
Triticum aestivum; no-tillage; continuous cropping; dicyandiamide; nitrapyrin; urea; nitrification; soil fertility; nitrogen content; wheat straw; crop yield; nutrient availability; edaphic factors; environmental factors; grains; Oklahoma
Abstract:
... Nitrification inhibitors (NIs) such as dicyandiamide (DCD) and nitrapyrin 12-chloro-6-(trichloromethyl)pyridine] (NP) slow the nitrification process, thus reducing N losses from leaching and denitrification. In field studies (1990-1994) on a Renfrow silt loam (fine-silty mixed, thermic Udertic Paleustolls) near El Reno, OK, we evaluated these two NIs and their placement effects on nitrification of ...
DOI:
10.2134/agronj1996.00021962003600060009x

9. Fall harvest management effects on 'Grasslands Matua' prairie grass quality

Author:
Hall, M.H.; Jung, G.A.; Shaffer, J.A.; Everhart, J.R.
Source:
Agronomy journal 1996 v.88 no.6 pp. 971-975
ISSN:
0002-1962
Subject:
Bromus catharticus; harvest date; stubble; height; crop quality; forage; fiber content; nutritive value; spring; autumn; Pennsylvania
Abstract:
... Forage production of 'Grasslands Matua' prairie grass [Bromus catharticus M. Vahl; syn. B. unioloides Kunth, B. willdenowii Kunth] (Matua, for short) during the fall months is excellent, but highly management dependent. Unfortunately, fall harvest management effects on the quality of this grass are relatively unknown. Our objectives were to determine the effects of fall harvest management on forag ...
DOI:
10.2134/agronj1996.00021962003600060021x

10. Forage yield and quality of six annual Medicago species in the north-central USA

Author:
Zhu, Y.; Sheaffer, C.C.; Barnes, D.K.
Source:
Agronomy journal 1996 v.88 no.6 pp. 955-960
ISSN:
0002-1962
Subject:
Medicago lupulina; Medicago sativa; Medicago rugosa; Medicago truncatula; Medicago scutellata; Medicago polymorpha; Medicago littoralis; spring; summer; crop yield; forage; crop quality; cultivars; crude protein; fiber content; sowing date; species differences
Abstract:
... Annual medics (Medicago spp.) have been extensively used as winter annual forage and green manure crops in Mediterranean regions, but their potential use in the north-central USA has not been evaluated. Our objective was to determine the summer and fall forage yield and forage quality of spring- and summer-seeded annual medics. Twelve commercial annual medic cultivars from Australia (representing ...
DOI:
10.2134/agronj1996.00021962003600060019x

11. Interactions involving allelopathy in cropping systems

Author:
Einhellig, F.A.
Source:
Agronomy journal 1996 v.88 no.6 pp. 886-893
ISSN:
0002-1962
Subject:
plants; allelopathy; environmental factors; allelochemicals; secondary metabolites; synergism; temperature; light; soil water content; water stress; plant diseases and disorders; insect pests; herbicides; ferulic acid
Abstract:
... Allelopathic inhibition typically results from the combined action of a group of allelochemicals which, collectively, interfere with severe physiological processes. The objectives of this paper are to summarize research that illustrates the joint action of allelochemicals, and to provide evidence that both the amount and detrimental action of these compounds depends on the extent of associated abi ...
DOI:
10.2134/agronj1996.00021962003600060007x

12. Limited applicability of the CENTURY model to highly weathered tropical soils

Author:
Gijsman, A.J.; Oberson, A.; Tiessen, H.; Friesen, D.K.
Source:
Agronomy journal 1996 v.88 no.6 pp. 894-903
ISSN:
0002-1962
Subject:
mathematical models; simulation models; soil organic matter; phosphorus; tropical soils; soil fertility; nutrient deficiencies; nutrient availability; equations
Abstract:
... The CENTURY soil organic matter model was developed to describe nutrient dynamics for soils of the North American Great Plains, but is now applied to other soil types and climates. Phosphorus transformations in CENTURY are based on empirical relationships, developed for soils where N is the most limiting nutrient. This restricts the model's applicability in P-limited soils, particularly those that ...
DOI:
10.2134/agronj1996.00021962003600060008x

13. Multinutrient fertilization and placement to improve yield and nutrient concentration of tall fescue

Author:
Sweeney, D.W.; Moyer, J.L.; Halvin, J.L.
Source:
Agronomy journal 1996 v.88 no.6 pp. 982-986
ISSN:
0002-1962
Subject:
Festuca arundinacea; nitrogen fertilizers; NPK fertilizers; trace element fertilizers; crop yield; nutrient content; crop quality; hay; nitrogen; phosphorus; potassium; sulfur; boron; zinc; calcium; magnesium; band placement; Kansas
Abstract:
... Although tall fescue (Festuca arundinacea Schreb.) is one of the major cool-season grasses used for animal feed in the USA, it often is unfertilized or is top-dressed with N alone. Additional fertilizer nutrients applied with N may improve yield and quality. Subsurface placement of N has been shown to improve cool-season grass production, but data are limited regarding effects of placement of diff ...
DOI:
10.2134/agronj1996.00021962003600060023x

14. Performance of buffelgrass germplasm with improved winter survival

Author:
Hussey, M.A.; Bashaw, E.C.
Source:
Agronomy journal 1996 v.88 no.6 pp. 944-946
ISSN:
0002-1962
Subject:
Cenchrus ciliaris; winter hardiness; cold tolerance; cultivars; genetic resistance; seedlings; mortality; winter; crop yield; defoliation; carbohydrates; genotype; chemical constituents of plants; Texas
Abstract:
... Lack of winter hardiness in buffelgrass [Cenchrus ciliaris L.; syn. Pennisetum ciliare (L.) Link] currently limits the utilization of this species in Texas and northern Mexico. This study was conducted to assess differences in field survival and yield potential of buffelgrass germplasm believed to have increased levels of winter hardiness. To document differences in field winter survival seedlings ...
DOI:
10.2134/agronj1996.00021962003600060016x

15. Pod yield and stem rot evaluation of peanut cultivars treated with tebuconazole

Author:
Branch, W.D.; Brenneman, T.B.
Source:
Agronomy journal 1996 v.88 no.6 pp. 933-936
ISSN:
0002-1962
Subject:
Arachis hypogaea; cultivars; chemical control; tebuconazole; Mycosphaerella berkeleyi; Corticium rolfsii; Thanatephorus cucumeris; irrigated conditions; disease resistance; genetic resistance; crop yield; pods; disease control; plant diseases and disorders; fungal diseases of plants; Georgia
Abstract:
... Tebuconazole {alpha[2-(4-chlorophenyl)ethyl]-alpha-(1,1 -dimethylethyl)-1H-1,2,4-triazole-1-ethanol}has been registered by the U.S. Environmental Protection Agency for use in peanut (Arachis hypogaea L.) production as a new sterol-inhibiting fungicide, under the trade name Folicur 3.6F. It is labeled to be used as four consecutive sprays between two applications of non-sterol-inhibiting fungicides ...
DOI:
10.2134/agronj1996.00021962003600060014x

16. Restoration of productivity to a desurfaced soil with livestock manure, crop residue, and fertilizer amendments

Author:
Larney, F.J.; Janzen, H.H.
Source:
Agronomy journal 1996 v.88 no.6 pp. 921-927
ISSN:
0002-1962
Subject:
Triticum aestivum; cattle manure; composts; mixtures; wood shavings; poultry manure; pig manure; crop residues; Pisum sativum; hay; barley straw; organic fertilizers; nitrogen fertilizers; phosphorus fertilizers; wheat straw; crop yield; soil fertility; nitrate nitrogen; eroded soils; phosphorus; nutrient uptake; dry matter accumulation; waste utilization; alfalfa; grains; alfalfa hay
Abstract:
... Many agricultural fields on the semiarid Canadian prairies have areas of inherently low productivity associated with loss of soil quality due to erosion. This study compared the efficacy of various amendments in restoring productivity to a desurfaced fine-loamy, mixed Typic Haploboroll (Lethbridge series) in southern Alberta. In spring 1992, 14 amendment treatments (including livestock manures, cr ...
DOI:
10.2134/agronj1996.00021962003600060012x

17. Role of warm-season weeds in spotted wilt epidemiology in the southeastern Coastal Plain

Author:
Johnson, W.C. III; Todd, J.W.; Culbreath, A.K.; Mullinixx, B.G. Jr.
Source:
Agronomy journal 1996 v.88 no.6 pp. 928-933
ISSN:
0002-1962
Subject:
Tomato spotted wilt virus; epidemiology; weed hosts; disease vectors; incidence; host range; Senna obtusifolia; Jacquemontia tamnifolia; Ipomoea lacunosa; Sida spinosa; Desmodium tortuosum; Xanthium; Xanthium strumarium; Arachis hypogaea; Nicotiana tabacum; Capsicum annuum
Abstract:
... The role of endemic weeds in the epidemiology of spotted wilt must be determined in order to develop an integrated system to manage the disease. Field studies were conducted from 1990 through 1992 to determine concurrently the incidence of spotted wilt and population dynamics of thrips (Thysanoptera: Thripidae) on seven warm season weeds and three crop species planted in microplots. Weeds examined ...
DOI:
10.2134/agronj1996.00021962003600060013x

18. Seed yield response of perennial ryegrass to low rates of paclobutrazol

Author:
Young, W.C. III; Chilcote, D.O.; Youngberg, H.W.
Source:
Agronomy journal 1996 v.88 no.6 pp. 951-955
ISSN:
0002-1962
Subject:
Lolium perenne; lodging; paclobutrazol; growth retardation; developmental stages; crop yield; yield components; seeds; application technology; application rate; application timing; Oregon
Abstract:
... Lodging of perennial ryegrass (Lolium perenne L.) seed crop is a widespread problem. Crop lodging reduces seed yield and interferes with seed harvest. This study was conducted to determine if low rates of paclobutrazol [(2RS,3RS)-1-(4-chlorophenyl) 4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)-pentan-3-ol] influences seed yield and yield components of perennial ryegrass cv. Pennfine. Paclobutrazol was ap ...
DOI:
10.2134/agronj1996.00021962003600060018x

19. Spectral properties of leaves deficient in iron, sulfur, magnesium, and manganese

Author:
Masoni, A.; Ercoli, L.; Mariotti, M.
Source:
Agronomy journal 1996 v.88 no.6 pp. 937-943
ISSN:
0002-1962
Subject:
Hordeum vulgare; Helianthus annuus; Zea mays; Triticum aestivum; nutrient deficiencies; detection; iron; sulfur; magnesium; manganese; chlorophyll; reflectance; optical properties; leaves; transmittance; light
Abstract:
... In crop plants, deficiency of an essential element may drastically reduce growth rate and yield. Research on the use of leaf spectral properties in the detection of crop mineral deficiency is needed. The objective of this study was to examine the effects of Fe, S, Mg, and Mn deficiency on reflectance (R), absorptance (A), and transmittance (T) spectra of barley (Hordeum vulgare L.), wheat (Triticu ...
DOI:
10.2134/agronj1996.00021962003600060015x

20. Spring nitrogen rate and timing influence on seed yield components of perennial ryegrass

Author:
Young, W.C. III; Youngberg, H.W.; Chilcote, D.O.
Source:
Agronomy journal 1996 v.88 no.6 pp. 947-951
ISSN:
0002-1962
Subject:
Lolium perenne; nitrogen fertilizers; developmental stages; crop yield; seeds; yield components; lodging; harvest index; application rate; application timing; Oregon
Abstract:
... Spring application of N generally increases seed yield of perennial ryegrass (Lolium perenne L.). Understanding the influence of N rates and timings on seed yield components can be used to improve N use efficiencies and seed yield. Field experiments during 1982 and 1983 at Oregon State University studied the effects of 60, 90, and 120 kg N ha-1, applied either at double-ridge stage (DR) or at spik ...
DOI:
10.2134/agronj1996.00021962003600060017x