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You searched for: Journal Agronomy journal Remove constraint Journal: 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. A Planter Designed for Rapid and Uniform Sowing in Flats

Author:
Gordon S. Miner
Source:
Agronomy journal 1971 v.63 no.5 pp. 811-812
ISSN:
0002-1962
Subject:
equipment design; rapid methods; seed germination; sowing
Abstract:
... A planter was designed and built to facilitate the sowing of seed in soil-filled wooden flats. All seed is placed at a given depth resulting in uniform emergence of plants. The planter also provides a rapid method of sowing on flats. ...
DOI:
10.2134/agronj1971.00021962006300050048x

2. 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

3. A Sunfleck Theory for Plant Canopies II. Penumbra Effect: Intensity Distributions along Sunfleck Segments

Author:
E. E. Miller; J. M. Norman
Source:
Agronomy journal 1971 v.63 no.5 pp. 739-743
ISSN:
0002-1962
Subject:
canopy; leaves; prediction
Abstract:
... The finite (1/2°) angular diameter of the sun causes the fuzziness of the shadow cast onto the ground by a leaf edge to increase in proportion to increase in height of the leaf. When a straight-line sunfleck segment is terminated by a leaf edge that cuts across it at a slant, the apparent width of the penumbral fringe displayed upon the segment-is stretched by the slant. In this paper the intensit ...
DOI:
10.2134/agronj1971.00021962006300050025x

4. Corn Emergence in Relation to Soil Temperature and Seeding Depth

Author:
J. Alessi; J. F. Power
Source:
Agronomy journal 1971 v.63 no.5 pp. 717-719
ISSN:
0002-1962
Subject:
Zea mays; seed germination; seeds; sowing; depth; seedling emergence; soil temperature; heat sums; plant growth; agricultural soils; silt loam soils; field experimentation; North Dakota
Abstract:
... Field and growth room experiments at Mandan, N. D., evaluated the effects of seed depth and soil temperature on corn (Zea mays L.) germination and emergence. In the growth room, from 4 to 24 days were required to achieve 80% emergence, depending upon soil temperature and seed depth. Increasing soil temperature from 13.3 to 26.7 C reduced the time for 80% emergence. Temperature had a much greater e ...
Handle:
10113/16808
DOI:
10.2134/agronj1971.00021962006300050018x

5. Differential Response of Corn Inbreds and Single Crosses to Certain Properties of an Acid Soil

Author:
J. A. Lutz; G. W. Hawkins; C. F. Genter
Source:
Agronomy journal 1971 v.63 no.5 pp. 803-805
ISSN:
0002-1962
Subject:
Zea mays; acid soils; acidity; corn; dolomitic limestone; greenhouse experimentation; inbred lines; inbreeding; pH; plant height; planting; silt loam soils; Connecticut; Iowa; Minnesota; Virginia
Abstract:
... Three greenhouse experiments were conducted in 1969 and 1970 in which maize (Zea mays L.) inbred lines and single crosses were grown on an untreated acid Greendale silt loam (pH 3.9) and on the same soil adjusted with pulverized dolomitic limestone to various pH levels. Plant-height measurements were made and dry-weight yields were determined 27 to 38 days after planting. There were highly signifi ...
DOI:
10.2134/agronj1971.00021962006300050044x

6. Diurnal Variation in Nonstructural Carbohydrates, In Vitro Digestibility, and Leaf to Stem Ratio of Alfalfa

Author:
V. L. Lechtenberg; D. A. Holt; H. W. Youngberg
Source:
Agronomy journal 1971 v.63 no.5 pp. 719-724
ISSN:
0002-1962
Subject:
Medicago sativa; alfalfa; aspartic proteinases; diurnal variation; dry matter digestibility; forage yield; fructose; glucose; hexoses; hydrolysis; in vitro digestibility; leaves; nutritive value; reducing sugars; resorcinol; solar radiation; starch; stems; sucrose
Abstract:
... SummaryAlfalfa (Medicago sativa L.) was sampled four times daily during first and second growths and eight times daily for three days during third growth in order to detect diurnal changes in carbohydrate constituency, in vitro digestibility, and leaf to stem ratio. The implications of these changes with regard to forage yield and nutritional value were considered. Reducing sugars and sucrose were ...
DOI:
10.2134/agronj1971.00021962006300050019x

7. 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

8. 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

9. 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

10. Effect of Photoperiod and Temperature on the Development of Sorghum

Author:
J. L. Caddel; D. E. Weibel
Source:
Agronomy journal 1971 v.63 no.5 pp. 799-803
ISSN:
0002-1962
Subject:
Sorghum bicolor; flowering; night temperature
Abstract:
... Three varieties of Sorghum bicolor (L.) Moench, (i.e., ‘Early Hegari,’ ‘80-Day Milo,’ and ‘Wheatland’) were grown in controlled environment chambers and subjected to all combinations of 10-, 12-, and 14-hour photoperiods, 27 and 32 C day temperatures, and 16 and 21 C night temperatures. Days to floral initiation were determined for each variety under each treatment combination. In addition, days t ...
DOI:
10.2134/agronj1971.00021962006300050043x

11. Effect of Rotations, Tillage Methods, and N Fertilization on Winter Wheat Production

Author:
Billy B. Tucker; M. B. Cox; H. V. Eck
Source:
Agronomy journal 1971 v.63 no.5 pp. 699-702
ISSN:
0002-1962
Subject:
Medicago sativa; Triticum; alfalfa; conventional tillage; crop rotation; fertilizer rates; grain yield; grasses; mulches; nitrogen fertilizers; rain; silt; streams; stubble; stubble tillage; winter wheat; Oklahoma
Abstract:
... Winter wheat (Triticum aestlvum L.) was grown continuously and in rotation with alfalfa (Medicago sativa L.) or grass on Pond Creek and Grant silt loams in the 64-cm rainfall area of north central Oklahoma. Studies were conducted from 1956 through 1967. Stubble mulch and clean tillage were compared in continuous wheat and alfalfa-wheat systems. The principal effect of alfalfa on wheat yield was to ...
DOI:
10.2134/agronj1971.00021962006300050012x

12. Effect of Soil Temperature on Mineral Element Composition and Morphology of the Potato Plant

Author:
Eliot Epstein
Source:
Agronomy journal 1971 v.63 no.5 pp. 664-666
ISSN:
0002-1962
Subject:
Solanum tuberosum; crop yield; elemental composition; manganese; minerals; phloem; plant growth; plant morphology; potatoes; roots; soil temperature; starch granules; tubers; xylem
Abstract:
... The influences of two soil temperatures, 5 and 29 C, were studied on potato (Solanum tuberosum) plant growth, tuber yield, and potato plant morphology. The low soil temperature enhanced tuber initiation. Analysis of several minerals showed that the Mn ratio of tops to roots was 0.42 at 5 C and 2.84 at 29 C. At 5 C proliferation and xylem development of roots was restricted, whereas at 29 C the xyl ...
DOI:
10.2134/agronj1971.00021962006300050002x

13. 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

14. Effects of Environment on an Infrared Field Thermometer

Author:
William J. McGinnies; R. C. W. Aronson
Source:
Agronomy journal 1971 v.63 no.5 pp. 813-814
ISSN:
0002-1962
Subject:
ambient temperature; laboratory experimentation; solar radiation; surface temperature; thermometers
Abstract:
... Accuracy and reliability of an infrared field thermometer were evaluated in field and laboratory tests. Thermal and solar radiation on the instrument itself, ambient temperature, and the temperature of the surface being measured, affected the indicated temperature of the surface temperature being measured. An infrared field thermometer of the type tested was considered unsuitable for field use. ...
DOI:
10.2134/agronj1971.00021962006300050050x

15. 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

16. 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

17. Evaluation of Water and Nitrogen Stress on Bromegrass Growth

Author:
J. F. Powers
Source:
Agronomy journal 1971 v.63 no.5 pp. 726-728
ISSN:
0002-1962
Subject:
Bromus inermis; plant growth; plant-water relations; drought; water stress; plant stress; soil fertility; soil nutrient balance
Abstract:
... Percent stress [reduction in growth rate of bromegrass (Bromus inermis L.) due to deficiency] was calculated by the method of Greenwood et al. to evaluate the effects of deficiencies of N, water, and N plus water combined. Dry matter yields of bromegrass receiving either (a) 270 kg/ha of N, (b) complete irrigation, (c) N plus irrigation, or (d) no treatment 3 weeks earlier were determined at perio ...
Handle:
10113/16995
DOI:
10.2134/agronj1971.00021962006300050021x

18. 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

19. Forage Yield of Switchgrass (Panicum virgatum) in Pennsylvania

Author:
C. C. Berg
Source:
Agronomy journal 1971 v.63 no.5 pp. 785-786
ISSN:
0002-1962
Subject:
Dactylis glomerata; Festuca arundinacea; Panicum virgatum; autumn; cool season grasses; dry matter accumulation; forage; forage production; forage yield; spring; summer; warm season grasses; winter; Pennsylvania
Abstract:
... The production of forage by a warm-season grass species (switchgrass, Panicum virgatum L.) was compared with cool-season grasses in the cool, humid northeastern United States. Dry-matter yields were obtained from two varieties of tall rescue (Festuca arundinacea Schreb.) and orchardgrass (Dactylis glomerata L.) and three varieties of switchgrass in 1969. Two other varieties of switchgrass failed t ...
DOI:
10.2134/agronj1971.00021962006300050038x

20. Growing Barley (Hordeum vulgare L.) on Beds in Saline Soil

Author:
A. D. Day; Fred Turner; R. M. Kirkpatrick
Source:
Agronomy journal 1971 v.63 no.5 pp. 768-769
ISSN:
0002-1962
Subject:
Hordeum vulgare; drilling; grain yield; planting; rain; saline soils; spring barley; weeds
Abstract:
... Studies were conducted over a 2-year period at Safford, Ariz, to compare two methods (conventional drilling and two rows per bed) and two rates (28 and 56 kg/ha) of planting spring barley (Hordeum vulgare L.) on elevated beds in saline soil. Beds were oriented in two directions: north to south and east to west. Conventional drilling on beds resulted in both higher grain yields and grain volume-wei ...
DOI:
10.2134/agronj1971.00021962006300050033x