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You searched for: Journal name Agronomy journal Remove constraint Journal name: Agronomy journal Publication year rev 8029-1971 Remove constraint Publication year rev: 8029-1971 Source 1971 v.63 no.5 Remove constraint Source: 1971 v.63 no.5
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1. Effect of Defoliation and Root-Pruning on Early Root Growth from Merion Kentucky Bluegrass Sods and Seedlings

Author:
J. H. Dunn; R. E. Engel
Source:
Agronomy journal 1971 v.63 no.5 pp. 659-663
ISSN:
0002-1962
Subject:
Poa pratensis; carbohydrate content; cutting; defoliation; root growth; root pruning; rooting; roots; seedlings
Abstract:
... Two root observation container tests and a solution-culture test were established to determine the effect of defoliation and root-pruning on root initiation and development from ‘Merion’ Kentucky bluegrass (Poa pratensis L.) sod and seedlings. The advantage of more rapid rerooting from sod and seedlings occurred with an increased amount of root removal as shown in three experiments. Sod pruned 1.3 ...
DOI:
10.2134/agronj1971.00021962006300050001x

2. Effect of N Fertilizer on Yield, Crude Protein Content, and in vitro Dry-Matter Disappearance in Phalaris arundinacea L.

Author:
Merle H. Niehaus
Source:
Agronomy journal 1971 v.63 no.5 pp. 793-794
ISSN:
0002-1962
Subject:
Phalaris arundinacea; application rate; crude protein; cultivars; dry matter accumulation; nitrogen; nitrogen fertilizers
Abstract:
... ‘Ioreed,’ ‘Frontier,’ and ‘Common,’ three cultivars of reed canarygrass, Phalaris arundinacea L., each grown at four rates of N, were evaluated for dry-matter yield, percentage of crude protein, and in vitro dry-matter disappearance (IVDMD). Nitrogen was applied at 75, 150, 300, and 600 kg/ha/yr. There was a large increase in dry-matter yield and percentage of crude protein in response to increase ...
DOI:
10.2134/agronj1971.00021962006300050041x

3. Effect of Nitrogen on Nodulation and Yield of Irrigated Soybeans

Author:
Benjamin H. Beard; Richard M. Hoover
Source:
Agronomy journal 1971 v.63 no.5 pp. 815-816
ISSN:
0002-1962
Subject:
Glycine max; ammonium sulfate; barley straw; burning; crop rotation; crop yield; fertilizer rates; flowering; irrigation; nitrogen; nodulation; planting date; shredding; soybeans
Abstract:
... Wayne soybeans [Glycine max L. (Merrill)] were sown immediately after barley harvest in a 2 crop, 1-year rotation experiment, to determine the effects of additions of nitrogen (as ammonium sulfate) on nodulation and yield. Treatments consisted of all combinations of: (i) barley straw residue (burned or shredded); (ii) timing of nitrogen application (before planting, at flowering or a combination); ...
DOI:
10.2134/agronj1971.00021962006300050051x

4. Effects of CCC on the Growth od Wheat Plants and their Untreated Progeny

Author:
U. G. Bokhari; V. B. Youngner
Source:
Agronomy journal 1971 v.63 no.5 pp. 809-811
ISSN:
0002-1962
Subject:
Triticum aestivum; caryopsis; foliar spraying; greenhouse production; progeny; soil drenching; spring wheat; tillers; yields
Abstract:
... The effects of a series of CCC concentrations and three methods of application on the growth and yield of Ramona 50' spring wheat (Triticum aestivum L.) were studied under greenhouse conditions. Results show that treatment of CCC as a soil drench was highly effective in reducing stem height, increasing the number of tillers per plant, and increasing yield. Foliar spray and seed soaking methods wer ...
DOI:
10.2134/agronj1971.00021962006300050047x

5. Effects of Row Cultivation on Growth and Yield of Soybeans

Author:
W. J. Russell; W. R. Fehr; R. L. Mitchell
Source:
Agronomy journal 1971 v.63 no.5 pp. 772-774
ISSN:
0002-1962
Subject:
Glycine max; crop yield; developmental stages; lodging; plant height; soybeans
Abstract:
... Systematic comparisons of the effects of cultivation treatments on the growth and yield of soybeans have not been reported. We evaluated the effects of six cultivation treatments on yield, maturity, lodging, and height of four soybean [Glycine max. (L.) Merrill] varieties, (‘Hark,’ ‘Amsoy,’ ‘Hawkeye,’ and ‘Wayne’) in three environments. Treatments were combinations of 64- and 114-mm depths of a st ...
DOI:
10.2134/agronj1971.00021962006300050035x

6. Effects of Shading and Nitrogen on Growth of Grass-Alfalfa Pastures

Author:
Wing-To Chan; A. F. MacKenzie
Source:
Agronomy journal 1971 v.63 no.5 pp. 667-669
ISSN:
0002-1962
Subject:
Medicago sativa; Phleum pratense; alfalfa; artificial shade; crop yield; grasses; hay; leaves; nitrogen; pastures; shade; solar radiation; Quebec
Abstract:
... The relative competitiveness of alfalfa under varying nitrogen and shade conditions must be known to manage grass-legume mixtures for maximum yield and quality of hay. Therefore, the growth of a grass-legume mixture (predominantly Phleum-pratense L. and Medicago sativa L.) under artificial shading and with added nitrogen was studied under field conditions in Quebec in 1967 and 1968. At low N level ...
DOI:
10.2134/agronj1971.00021962006300050003x

7. Forage Characteristics Limiting Animal Performance on Warm-season Perennial Grasses

Author:
R. L. Duble; J. A. Lancaster; E. C. Holt
Source:
Agronomy journal 1971 v.63 no.5 pp. 795-798
ISSN:
0002-1962
Subject:
Cynodon dactylon; Eragrostis curvula; Panicum coloratum; Paspalum notatum; acid detergent fiber; average daily gain; cell walls; dry matter digestibility; forage; grazing; heifers; in vitro digestibility; lignification; lignin; pastures; perennial grasses; silica; summer; warm season; yearlings
Abstract:
... Chemical and in vitro characteristics of six perennial summer grasses {common, ‘Coastal’ and ‘Coastcross-1’ bermudagrasses [Cynodon dactylon (L.) Pers.]; ‘Pensacola’ bahiagrass [Paspalum notatum Flugge]; common weeping lovegrass [Eragrostis curvula (Schrad.) Nees.]; and ‘Kleingrass 75’ [Panicum coloratum L.]} were determined to identify factors limiting the performance of grazing animals. In vitro ...
DOI:
10.2134/agronj1971.00021962006300050042x

8. Harvesting Vernonia Anthelmintica (L.) Willd. to Reduce Seed Shattering Losses

Author:
John H. Massey
Source:
Agronomy journal 1971 v.63 no.5 pp. 812
ISSN:
0002-1962
Subject:
Baccharoides anthelmintica; cutting; harvesting; seed shattering
Abstract:
... Results from four methods of harvesting Vernonia anthelmintica (L.) Willd. seed indicated that the highest yield (1,369 kg/ha) was obtained by cutting and windowing plants before seedheads opened. When harvest was delayed until all seed had ripened, yields were reduced to 264 kg/ha by shattering. Other methods gave intermediate yields. ...
DOI:
10.2134/agronj1971.00021962006300050049x

9. In Vitro Dry-Matter Digestibility of ‘Midland’ Bermudagrass Grown at Several Levels of N Fertilization

Author:
Henry A. Fribourg; Ned C. Edwards; Karl M. Barth
Source:
Agronomy journal 1971 v.63 no.5 pp. 786-788
ISSN:
0002-1962
Subject:
Cynodon dactylon; application rate; dry matter accumulation; dry matter digestibility; fertilizer application; in vitro digestibility; inoculum; nitrogen fertilizers; steers
Abstract:
... ‘Midland’ bermudagrass [Cynodon dactylon (E.) Pers.] was grown at three locations without and with N fertilizer applied at several rates; four replications of a randomized complete block (RCB) design were used at each location. Dry-matter yields of about 4 t/ha were produced by the no-N treatment. This was doubled by adding 133 kg/ha of N and doubled again when 400 kg/ha of N were added. The 800 k ...
DOI:
10.2134/agronj1971.00021962006300050039x

10. Interpreting the Rate of Change in Nitrate-Nitrogen in Sugarbeet Petioles

Author:
J. N. Carter; M. E. Jensen; S. M. Bosma
Source:
Agronomy journal 1971 v.63 no.5 pp. 669-674
ISSN:
0002-1962
Subject:
Beta vulgaris; beets; fertilizer rates; growing season; irrigation rates; nitrate nitrogen; nitrogen fertilizers; nutrition; petioles; prediction; sucrose; sugar beet
Abstract:
... Nitrate-nitrogen in sugarbeet petioles is used to evaluate current N status of sugarbeet crops. Since the NO3-N changes rapidly during the season, better relationships are needed to interpret these data relative to sugarbeet N nutrition. Sugarbeets (Beta vulgaris, L.) were grown at four N fertilization rates and two irrigation levels to determine the root yield, sucrose percentage, sucrose yield, ...
DOI:
10.2134/agronj1971.00021962006300050004x

11. Iron and Zinc Response of Chlorotic Rice Grown on Calcareous Soils

Author:
D. G. Westfall; W. B. Anderson; R.J. Hodges
Source:
Agronomy journal 1971 v.63 no.5 pp. 702-705
ISSN:
0002-1962
Subject:
Oryza sativa; bicarbonates; calcareous soils; calcium; chlorosis; ferric sulfate; iron; pH; rice; seedlings; yields; zinc; zinc sulfate
Abstract:
... Iron and Zn source and rate experiments were carried out in the field on soils where rice (Oryza sativa L.) strain yields had been reduced drastically in previous years by seedling chlorosis. Soils where seedling chlorosis occurred were higher in pH, HCO₃ and Ca content and lower in Fe and Zn than adjacent soils where normal growth occurred. Iron sulfate, alone or in combination with ZnSO₄, was th ...
DOI:
10.2134/agronj1971.00021962006300050013x

12. Nitrogen and Sulfur Nutrition of Sweet Corn in Relation to Fertilization and Water Composition

Author:
L. A. Daigger; R. L. Fox
Source:
Agronomy journal 1971 v.63 no.5 pp. 729-730
ISSN:
0002-1962
Subject:
Zea mays; ammonium nitrate; corn; fertilizer application; gypsum; hydrochemistry; irrigation water; leaves; nitrification; nitrogen; nutrition; probability; sandy loam soils; soil solution; sulfur; sulfur fertilizers; sweetcorn; Nebraska
Abstract:
... The external and internal S and N requirements of field-grown sweet corn (Zea mays) were investigated. The experimental soil was a Bridgeport fine sandy loam of western Nebraska. It contained 4 ppm extractable sulfate-S. Irrigation water contained 3 ppm S. Nitrification rate was 14 ppm during 10 days at 25 C. Five N levels (45, 90, 135, 180, and 225 kg/ha as NH₄NO₃) and 3 S levels (0, 22, and 666 ...
DOI:
10.2134/agronj1971.00021962006300050022x

13. Nutritive Relationships in Low- and High-tannin Sericea Lespedeza Under Grazing

Author:
E. D. Donnelly; W. B. Anthony; J. W. Langford
Source:
Agronomy journal 1971 v.63 no.5 pp. 749-751
ISSN:
0002-1962
Subject:
Lespedeza cuneata; crude protein; digestibility; digestible dry matter; dry matter intake; forage; grazing; steers
Abstract:
... A study was made on low- and high-tannin sericea lespedeza [Lespedeza cuneata (Dumont) G. Don] to obtain information, using grazing steers, on the relationship of tannin and digestible dry matter (DDM), digestibility of crude protein, daily dry-matter intake, and daily DDM intake. Tannin, crude protein, DDM, digestibility of crude protein, daily dry-matter intake, daily DDM intake, and fecal crude ...
DOI:
10.2134/agronj1971.00021962006300050027x

14. Paraffin Oil and Granules as Carriers for Trifluralin

Author:
D. N. Weaver; R. E. Meyer; M. G. Merkle
Source:
Agronomy journal 1971 v.63 no.5 pp. 705-708
ISSN:
0002-1962
Subject:
clay soils; field capacity; gas chromatography; granules; oils; trifluralin; vapors; volatilization
Abstract:
... This study was conducted to determine the effects of the carrier on the stability of trifluralin (α,α,α-trifluoro- 2,6-dinitro-N,N-dipropyl-p-toluidine) at the soil surface. Trifluralin concentrations were determined with a gas chromatograph equipped with an electron-capture detector. In the laboratory, more trifluralin disappeared from wet soil (80% field capacity) after 24 hours when applied in ...
DOI:
10.2134/agronj1971.00021962006300050014x

15. Reliability of Salinity Sensors for the Management of Soil Salinity

Author:
J. D. Oster; L. S. Willardson
Source:
Agronomy journal 1971 v.63 no.5 pp. 695-698
ISSN:
0002-1962
Subject:
calibration; salinity; soil salinity; topography
Abstract:
... Laboratory-constructed and commercial salinity sensors were evaluated for stability of calibration and accuracy of measurement of soil salinity. Of the commercial sensors 85% were stable and performed satisfactorily for at least 1.5 years with an estimated accuracy of ± 0.6 mmho cm⁻¹. Laboratory-constructed sensors were accurate to ± 1 mmho cm⁻¹. Commercial sensors were used to monitor soil salini ...
DOI:
10.2134/agronj1971.00021962006300050011x

16. Response of Plant Water Potential to the Irrigated Environment of Southern Idaho

Author:
J. W. Cary; J. L. Wright
Source:
Agronomy journal 1971 v.63 no.5 pp. 691-695
ISSN:
0002-1962
Subject:
Beta vulgaris; Hordeum vulgare; Medicago sativa; Phaseolus vulgaris; Pisum sativum; Triticum aestivum; Zea mays; crop management; crop production; crops; evapotranspiration; growing season; growth chambers; irrigated conditions; irrigated farming; irrigation; microclimate; soil water; soil water content; soil water potential; Idaho
Abstract:
... Laboratory studies have shown that plant water potential affects a number of key processes involved in growth, but there has been almost no information on what levels of water potential occur under irrigated conditions in the field. Before assessing the practical implication of laboratory results on soil and crop management, this type of information must be available. Consequently, plant water pot ...
DOI:
10.2134/agronj1971.00021962006300050010x

17. Soil Heating Studies with Cool Season Turfgrasses. I. Effects of Watt Density, Protective Covers, and Ambient Environment on Soil Temperature Distribution

Author:
F. B. Ledeboer; C. G. McKiel; C. R. Skogley
Source:
Agronomy journal 1971 v.63 no.5 pp. 677-680
ISSN:
0002-1962
Subject:
cold season; heat; lawns and turf; polypropylenes; soil depth; soil heating; soil temperature; spring; thermostats; turf grasses; winter
Abstract:
... Electrical soil heating studies were conducted from 1967 to 1969 for the purpose of determining wattage and soil temperature requirements for establishment and growth of several turfgrasses during winter. Studies also included influence of Protective Covers, fertilization and heat distribution in the soil. Cables were installed 15.2 cm deep and 30.4 cm apart to provide wattages of 54,108 and 162/m ...
DOI:
10.2134/agronj1971.00021962006300050006x

18. Soil Heating Studies with Cool Season Turfgrasses. II. Effects of N Fertilization and Protective Covers on Performance and Chlorophyll Content

Author:
F. B. Ledeboer; C. R. Skogley; C. G. McKiel
Source:
Agronomy journal 1971 v.63 no.5 pp. 680-685
ISSN:
0002-1962
Subject:
ambient temperature; chlorophyll; cold season; fertilizer application; lawns and turf; nitrogen; nitrogen fertilizers; shade; soil heating; soil temperature; spring; turf grasses; winter
Abstract:
... A study was made during the winter of 1968–69 to determine the influence of protective covers and supplemental N on several grasses growing on electrically heated soil. Turfgrass responses measured were visual turf quality, clipping dry weights, chlorophyll content, and verdure characteristics. In early winter, increased soil temperature, cover density and N treatments enhanced turf quality and gr ...
DOI:
10.2134/agronj1971.00021962006300050007x

19. Soil Heating Studies with Cool Season Turfgrasses. IV. Energy Requirements for Electric Soil Heating

Author:
C. G. McKiel; F. B. Ledeboer; C. R. Skogley
Source:
Agronomy journal 1971 v.63 no.5 pp. 689-691
ISSN:
0002-1962
Subject:
cold season; electric power; environmental factors; heat sums; lawns and turf; soil; soil heating; turf grasses
Abstract:
... Electrical energy use was recorded for soil heating studies conducted in turf from 1967 to 1969. Heating densities of 54 W/m² (5W/ft²), 108 W/m² (10 W/ft²), and 162 W/m² (15 W/ft²) were employed. Energy consumption was a function of environmental conditions. Regression lines were constructed from kilowatt-hour and degree-day data. These data should be useful for estimating energy requirements of s ...
DOI:
10.2134/agronj1971.00021962006300050009x

20. A Sunfleck Theory for Plant Canopies I. Lengths of Sunlit Segments along a Transect

Author:
E. E. Miller; J. M. Norman
Source:
Agronomy journal 1971 v.63 no.5 pp. 735-738
ISSN:
0002-1962
Subject:
canopy; leaf area; leaves; light intensity; probability; probability distribution; solar radiation
Abstract:
... The size distribution of sunflecks under a plant canopy can be represented by the length distribution of sunlit segments along a straight-line transect drawn under the canopy. A mathematical connection is deduced between this sunlit-length distribution and the probability, as a function of length, that a short line placed randomly under the canopy will be everywhere in sunlight. In turn, this prob ...
DOI:
10.2134/agronj1971.00021962006300050024x