Mowing Effects on Root Production, Growth, and Mortality of Creeping Bentgrass

Crop Science ◽  
2002 ◽  
Vol 42 (4) ◽  
pp. 1241-1250 ◽  
Author(s):  
Xiaozhong Liu ◽  
Bingru Huang
Keyword(s):  
Creeping Bentgrass ◽  
Root Production ◽  
Production Growth

scholarly journals Evaluation of Drought Tolerance and Avoidance Traits for Six Creeping Bentgrass Cultivars

HortScience ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 519-524 ◽  
Author(s):  
Stephen E. McCann ◽  
Bingru Huang
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Water Use ◽  
Photochemical Efficiency ◽  
Creeping Bentgrass ◽  
Root Production ◽  
Drought Avoidance ◽  
Relative Water ◽  
Leaf Relative Water Content ◽  
Use Efficiency

The objectives of this study were: 1) to compare drought responses between the more recently developed creeping bentgrass cultivars to standard cultivars and 2) to determine differential drought tolerance and avoidance characteristics associated with cultivar variation in drought resistance. Six cultivars of creeping bentgrass (Agrostis stoloniferia) (‘Penn A-4’, ‘Independence’, ‘Declaration’, ‘L-93’, ‘Penncross’, and ‘Putter’) were maintained in growth chambers at 20 °C day/15 °C night either well-watered or exposed to drought stress by withholding water for 17 days. Cultivars varied in turf performance and physiological responses (leaf relative water content and photochemical efficiency) to drought stress, which was reflected in their differences in drought tolerance (osmotic adjustment) and drought avoidance traits (water use rate and efficiency, root viability, root length, and number). ‘Penn A-4,’ ‘Independence,’ and ‘L-93’ generally performed better than other three cultivars under drought conditions, mainly through maintaining higher water use efficiency, root viability, root elongation, or root production. The majority of physiological parameters evaluated suggested that of the six creeping bentgrass cultivars examined in this study, the three cultivars with better ability to survive drought stress used mainly avoidance traits related to water use and water uptake.

THE INFLUENCE OF WEAR AND NITROGEN ON CREEPING BENTGRASS GROWTH

1983 ◽  
Vol 63 (1) ◽  
pp. 189-193 ◽  
Author(s):  
G. P. KOHLMEIER ◽  
J. L. EGGENS
Keyword(s):  
Sandy Loam ◽  
Leaf Tissue ◽  
Creeping Bentgrass ◽  
Soil Bulk Density ◽  
Root Production ◽  
Reliable Estimate ◽  
Agrostis Palustris ◽  
Leaf Injury ◽  
Annual Bluegrass ◽  
Putting Green

The effects of nitrogen and wear stress on the growth of Penncross creeping bent-grass (Agrostis palustris Huds.) maintained as a putting green was evaluated from June 1978 to November 1979. The 8-yr-old sward was grown on a Fox sandy loam, mowed five times weekly and irrigated as required. Nitrogen was applied as ammonium nitrate at 1.5, 3.0 and 6 kg N∙100 m−2. Wear treatments, applied for specific periods of time, were zero, three and six passes per day. Turf injury was due to direct wear stress rather than soil compaction as the soil bulk density was unaltered by wear treatment. As wear treatments increased, thatch thickness, clipping yields and healing potential decreased. Electrical resistance measurements of leaf tissue decreased as wear stress increased. This technique provided a rapid and reliable estimate of leaf injury from wear stress. Nitrogen at 3 kg∙100 m−2 increased healing potential, turf greenness and root production over the zero N treatment. However, 6 kg N∙100∙m−2 was excessive. Despite the significant increase in green color, there was no significant increase in healing potential and root growth over the 3-kg rate and the annual bluegrass content of the turf was increased.Key words: Annual bluegrass, thatch, healing potential

scholarly journals Velvet Bentgrass and Creeping Bentgrass Growth, Rooting, and Quality with Different Root Zone Media and Fertility Regimes

HortScience ◽  
2012 ◽  
Vol 47 (2) ◽  
pp. 205-211 ◽  
Author(s):  
John Watson ◽  
François Hébert ◽  
Eric M. Lyons ◽  
Theo Blom ◽  
Katerina S. Jordan
Keyword(s):  
Root Zone ◽  
Creeping Bentgrass ◽  
Dry Weight ◽  
Root Production ◽  
Nitrogen Rate ◽  
Root Zones ◽  
Shoot Dry Weight ◽  
Turfgrass Quality ◽  
Nitrogen Rates ◽  
Agrostis Canina

Two complementary greenhouse studies were conducted to examine the effects of different root zones and fertilization regimes on ‘SR7200' velvet bentgrass (Agrostis canina L.) and L-93 creeping bentgrass (Agrostis stolonifera L.). In the first study, in which only velvet bentgrass was studied, peat content in the root zone mixture contributed significantly to initial establishment of this species and high seeding rates increased cumulative shoot dry weight early in establishment but became less significant as the turfgrass matured. Higher phosphorus rates contributed to increased cumulative shoot dry weight over the first 4 weeks of the experiment. Nitrogen rate was the most significant factor positively affecting both cumulative shoot dry weight and turfgrass quality. In the second experiment with both velvet bentgrass and creeping bentgrass, nitrogen rate significantly increased turfgrass quality when measured at Week 5, halfway through the experiment. Over time, however, turf growth and quality were negatively impacted in both species with increasing nitrogen rates. Root zone composition had a significant effect on initial establishment of both bentgrasses with greater peat content leading to higher quality early on. Cumulative shoot dry weight increased with increasing nitrogen rate but at higher rates, there was a concomitant decrease in root production.

Use of TEM in Plant Disease Diagnosis: A Xylem-Limited Bacterium Associated with Diseased ‘Toronto’ Creeping Bentgrass

1981 ◽  
Vol 39 ◽  
pp. 414-415
Author(s):  
Karen K. Baker ◽  
David L. Roberts
Keyword(s):  
Osmium Tetroxide ◽  
Plant Disease ◽  
Leaf Tissue ◽  
Infectious Agent ◽  
Creeping Bentgrass ◽  
Disease Diagnosis ◽  
Unknown Etiology ◽  
Agrostis Palustris ◽  
Putting Greens ◽  
Plant Disease Diagnosis

Plant disease diagnosis is most often accomplished by examination of symptoms and observation or isolation of causal organisms. Occasionally, diseases of unknown etiology occur and are difficult or impossible to accurately diagnose by the usual means. In 1980, such a disease was observed on Agrostis palustris Huds. c.v. Toronto (creeping bentgrass) putting greens at the Butler National Golf Course in Oak Brook, IL.The wilting symptoms of the disease and the irregular nature of its spread through affected areas suggested that an infectious agent was involved. However, normal isolation procedures did not yield any organism known to infect turf grass. TEM was employed in order to aid in the possible diagnosis of the disease.Crown, root and leaf tissue of both infected and symptomless plants were fixed in cold 5% glutaraldehyde in 0.1 M phosphate buffer, post-fixed in buffered 1% osmium tetroxide, dehydrated in ethanol and embedded in a 1:1 mixture of Spurrs and epon-araldite epoxy resins.

Trends and forecasts of the global availability of food

2020 ◽  
Vol 16 (7) ◽  
pp. 1297-1316
Author(s):  
O.N. Terent'eva
Keyword(s):  
High Risk ◽  
Growth Rates ◽  
Statistical Data ◽  
Economic Security ◽  
Agricultural Products ◽  
Mortality And Morbidity ◽  
National Economic ◽  
Production Growth ◽  
Country Analysis ◽  
Cross Country

Subject. The stable supply of food to people is a cornerstone for the national economic security, while a lack of food or its expensiveness may undermine the economy, principles of power, and cause panics and wars. Malnutrition and hunger are critical indicators of the insufficient foods supply. Objectives. The article indicates which countries have high risk of hunger, and predicts its further movement. I also evaluate factual trends in the availability of food across countries. Methods. The study refers to statistical data in public domain, including the FAOSTAT. I apply methods of ranking, abstraction, prediction. Results. I performed the cross-country analysis and discovered that 117 countries demonstrated signs of malnutrition. The article sets forth a technique for splitting countries into five groups by level of hunger risk. The article compares data on hunger in the countries and consequences of mortality and morbidity. I ranked countries by key types of agricultural products and explained their production growth rates for a span of 18 years. I predicted how countries would be ranked in terms of hunger from 2030 to 2050, and found the extent to which the hunger risk will escalate in more flourishing countries. Conclusions and Relevance. Hunger and shortage of food seem invincible in the countries where people are hungry or very hungry. Sometimes it appears almost impossible for respective governments to solve the issue. Triggering the systemic hunger, such factors and premises are beyond control of starving countries. Hence, the international community should provide their support and aid to them.

INFLUENCE OF INVESTMENTS ON THE ECONOMIC GROWTH OF THE COUNTRY

2020 ◽  
Vol 7 (3) ◽  
pp. 28-33
Author(s):  
Ravshan Mamatov ◽  
Keyword(s):  
Economic Growth ◽  
Annual Growth ◽  
Production Factors ◽  
Fixed Assets ◽  
Production Growth ◽  
Total Investment ◽  
The Republic ◽  
Investment In Fixed Assets

The economic growth of the Republic of Uzbekistan will depend on production factors that contribute to the annual growth of the country's GDP. At the same time, extensive production growth will lead to the implementation of unpromising investments. A growing share of innovation-oriented investments in the total investment in fixed assets in the country will lead to intensive economic growth in the country

Territorial Features of Application of Precision Farming Technologies

2020 ◽  
pp. 59-66
Author(s):  
E.A. Skvortsov ◽  
◽  
A.S. Gusev ◽  
Keyword(s):  
Regional Development ◽  
Unemployment Rate ◽  
Negative Correlation ◽  
Agricultural Production ◽  
Agricultural Development ◽  
Precision Farming ◽  
Production Index ◽  
Scientific Problem ◽  
Development Indicators ◽  
Production Growth

The article discusses the issues of territorial patterns in the implementation of precision farming technologies, which are insufficiently studied and constitute a significant scientific problem. The purpose of the study is to identify the territorial patterns of the introduction of precision farming technologies in conjunction with the indicators of agricultural development in the regions. The number of applied precision farming technologies was clarified, 37 regions took part in the study, 24 of them provided information on the application of these technologies. The results of correlation of regional development indicators (12 indicators in three blocks) and the amount of equipment with precision farming elements are presented. The greatest positive correlation is observed between the introduction of precision farming technologies and the agricultural production index at comparable prices (0.51) and the level of subsidies (0.37). The greatest negative correlation is observed between the introduction of these technologies and the change in the registered unemployment rate (-0.3). Based on the results obtained, it can be assumed that in regions with high values of agricultural production growth and subsidies, precision farming technologies will be most intensively introduced.

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