scholarly journals Corn Hybrid Response to Water Management Practices on Claypan Soil

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Kelly A. Nelson ◽  
Randall L. Smoot
Keyword(s):  
Water Management ◽  
Grain Quality ◽  
Management Practices ◽  
Plant Population ◽  
Management Systems ◽  
Corn Production ◽  
The Past ◽  
Claypan Soil ◽  
Response To Water ◽  
Corn Hybrid

A study evaluated corn (Zea maysL.) hybrids (Asgrow785, DKC61-73, DKC63-42, LG2642, and Kruger2114) and water management systems (nondrained, nonirrigated (NDNI); drained, nonirrigated (DNI) with subsurface drain tiles 6.1 and 12.2 m apart; drained plus subirrigated (DSI) with tiles 6.1 and 12.2 m apart; nondrained, overhead irrigated (NDOHI)) on yields, plant population, and grain quality from 2008 to 2010. Precipitation during this study was 36 to 283 mm above the past decade. Planting date was delayed 18 d in the nondrained control in 2009, and additional delayed planting controls were included this year. Grain yields were similar in the 6.1- and 12.2 m-spaced DNI and DSI systems in 2008 and 2010, but plant population increased 74% and yields were 3.1 Mg ha−1greater with DSI at a 6.1 m spacing compared to 12.2 m in 2009. At a 6.1 m spacing, DNI or DSI increased yield 1.1 to 6.6 Mg ha−1(10 to over 50%) compared to NDNI or NDOHI soil. High yielding hybrids achieved similar yields with DNI, while NDNI DKC63-42 had 1.2 Mg ha−1greater yields compared to DKC61-73. A 6.1 m spacing for DNI claypan soils is recommended for high yielding corn production.

Simulation and Evaluation of Water Management Systems for a Pine Plantation Watershed

1992 ◽  
Vol 16 (1) ◽  
pp. 48-56 ◽  
Author(s):  
E. J. McCarthy ◽  
R. W. Skaggs
Keyword(s):  
Water Management ◽  
Plant Growth ◽  
Soil Water ◽  
Loblolly Pine ◽  
Management Practices ◽  
Management Systems ◽  
Controlled Drainage ◽  
Water Conditions ◽  
Soil Water Conditions ◽  
Simulation And Evaluation

Abstract Water management on forest watersheds can have off-site impacts on the environment as well as on-site impacts on soil water conditions for plant growth. This study was conducted to evaluate the hydrologic impacts and soil water implications for plant growth of alternative water management practices. The forest watershed system modeled was a loblolly pine (Pinus taeda) plantation in the Coastal Plain of North Carolina. The site is characterized by flat, poorly drained soils (thermic typic umbraquults) which are drained with open ditches 100 m apart. No drainage, free (conventional) drainage, alternative forms of controlled drainage and stocking control were modeled to determine effects on water table position and drainage outflow. Silvicultural systems, including an unthinned and a commercially thinned regime, were modeled. The water management systems were evaluated by criteria quantifying both off-site implications and on-site plant-water relationships. Controlled drainage systems were found to be successful in reducing drainage outflow rates and volumes and improving soil water conditions for tree growth. In addition, hydrologic components were examined over the life of the unthinned and thinned forest stands, from planting to harvest. Stand development and silviculture were shown to have significant effects on the hydrology of the forest. South. J. Appl. For. 16(1):48-56.

Effects of hybrids, population densities, fertilization and irrigation on grain corn (Zea mays L.) in Quebec

1992 ◽  
Vol 72 (4) ◽  
pp. 1163-1170 ◽  
Author(s):  
B. C. Liang ◽  
A. F. MacKenzie ◽  
M. Remillard
Keyword(s):  
Zea Mays ◽  
Population Density ◽  
Management Practices ◽  
Zea Mays L ◽  
Plant Population ◽  
Population Densities ◽  
Clay Loam Soil ◽  
Eastern Canada ◽  
Corn Production ◽  
Loam Soil

The increase in area for corn production in eastern Canada has stimulated the search for improvements in corn management practices to obtain higher yields. The purpose of this study was to investigate the effects of maize (Zea mays L.) hybrids, plant population density, rates of fertilization and irrigation on grain yield. A field experiment was conducted on a Chicot sandy clay loam soil in Quebec from 1984 to 1986. Corn attained grain yields of 10.9–15.2 Mg ha−1. These yields were attained only when all management inputs were at optimum levels. No single hybrid was superior over the 3-yr-period. High plant population densities, if not accompanied by other inputs, decreased yields. In moist, cooler years, effects of management factors were reduced, and only high plant population densities seemed to increase production. High rates of fertilization increased yields only when other management levels were high.Key words: Population density, irrigation, fertilization, hybrid, Zea mays, grain

scholarly journals Survey of Best Management Practices in Container Production Nurseries

2000 ◽  
Vol 18 (3) ◽  
pp. 142-144
Author(s):  
Glenn B. Fain ◽  
Charles H. Gilliam ◽  
Ken M. Tilt ◽  
John W. Olive ◽  
Beth Wallace
Keyword(s):  
Water Management ◽  
Coastal Zone ◽  
Best Management Practices ◽  
Management Practices ◽  
Control Release ◽  
Runoff Water ◽  
Best Management ◽  
The Past ◽  
Container Production

Abstract Twenty-four nurseries producing container-grown plants were surveyed along the coastal zone of south Alabama to determine Best Management Practices (BMPs) implemented since 1988. All nurseries utilized multiple BMPs. Seventy-five percent of all nurseries surveyed have the capability to capture runoff water; however, larger nurseries (medium 4.5–16.6 ha (11–40 A); large 16.6+ ha (40+A)) were more likely to capture runoff than smaller nurseries 0.4–4.1 ha (1–10 A). Since 1988, 78% of all collection ponds have been built with 44% of those being built in the past 5 years. Other BMPs widely used included installation of grass filter/erosion strips, having specific personnel devoted to water management, use of control release fertilizers, scouting for pests, use of horticultural oils, and staggered herbicide applications.

scholarly journals Water Management Practices Affect Arsenic and Cadmium Accumulation in Rice Grains

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Liming Sun ◽  
Manman Zheng ◽  
Hongyan Liu ◽  
Shaobing Peng ◽  
Jianliang Huang ◽  
...  
Keyword(s):  
Water Management ◽  
Grain Quality ◽  
Management Practices ◽  
Field Studies ◽  
Cadmium Accumulation ◽  
Rice Cultivation ◽  
Aerobic Rice ◽  
Flooded Rice ◽  
Rice Grains ◽  
Promising Strategy

Cadmium (Cd) and arsenic (As) accumulation in rice grains is a great threat to its productivity, grain quality, and thus human health. Pot and field studies were carried out to unravel the effect of different water management practices (aerobic, aerobic-flooded, and flooded) on Cd and As accumulation in rice grains of two different varieties. In pot experiment, Cd or As was also added into the soil as treatment. Pots without Cd or As addition were maintained as control. Results indicated that water management practices significantly influenced the Cd and As concentration in rice grains and aerobic cultivation of rice furnished less As concentration in its grains. Nonetheless, Cd concentration in this treatment was higher than the grains of flooded rice. Likewise, in field study, aerobic and flooded rice cultivation recorded higher Cd and As concentration, respectively. However, growing of rice in aerobic-flooded conditions decreased the Cd concentration by 9.38 times on average basis as compared to aerobic rice. Furthermore, this treatment showed 28% less As concentration than that recorded in flooded rice cultivation. The results suggested that aerobic-flooded cultivation may be a promising strategy to reduce the Cd and As accumulations in rice grains simultaneously.

HOUSEHOLDERS AS WATER MANAGERS: A COMPARISON OF DOMESTIC-SCALE WATER MANAGEMENT PRACTICES FROM TWO CENTRAL MAYA LOWLAND SITES

2018 ◽  
Vol 29 (1) ◽  
pp. 197-217 ◽  
Author(s):  
Jeffrey L. Brewer
Keyword(s):  
Water Management ◽  
Management Practices ◽  
Household Level ◽  
Small Reservoirs ◽  
The Past ◽  
Level Data ◽  
Preclassic Period ◽  
Household Water ◽  
Maya Civilization ◽  
And Storage

AbstractMultiple studies conducted over the past few decades have recognized the necessity of rainwater collection and storage as a critical aspect in the evolution of Maya civilization. Few of these efforts, however, have emphasized the importance of managing water resources at the household level. Data are presented from two central lowland sites—the dispersed hinterland community of Medicinal Trail and the urban center of Yaxnohcah—that elucidate the function of small reservoirs and associated landscape modifications in residential water management. Despite differing physical geographies and trajectories of urban development, residents of both communities were clearly engaged in water management activities based, at least in part, on the creation and use of small reservoirs. Decentralized household water management practices appear to have been temporally and spatially widespread components of Maya civilization beginning in the Preclassic period.

scholarly journals Water management in ancient Alexandria, Egypt. Comparison with Constantinople Hydraulic System

2021 ◽  
Author(s):  
S. Spanoudi ◽  
A. Colfinopoulos ◽  
I. Kalavrouziotis
Keyword(s):  
Water Management ◽  
Hydraulic System ◽  
Management Practices ◽  
Management Systems ◽  
Nile River ◽  
Urban Structure ◽  
Construction Work ◽  
Underground Structures ◽  
Storage Structures ◽  
Archaeological Excavations

Abstract The collection, evaluation and listing of all available data related to the supply, collection and disposal of water, is a project of combining and recording all the data for infrastructure projects and their structure within the urban structure of Alexandria and the wider region, as it was discovered and studied to this day. The paper is a description of the most important storage structures for the waters of the Nile River and the rain. Composing data from previous descriptions, archaeological excavations and random discoveries during construction work created a database. This database currently has 144 tanks of 1 to 4 levels, from 6 m3 to 2,500 m3. In particular they have been identified 27 tanks in 1 level, 50 tanks on 2 levels, 49 tanks on 3 levels, 9 tanks on 4 levels and 9 tanks whose exact morphology is unknown to us. The examples of reservoir technologies and management practices given in this work may be of some importance to the sustainability of water resources for the present and the future. Reservoirs have been used to store both rainwater and spring and river water to meet the needs of seasonal variations. The tanks range from simple to large underground structures. Then a comparison is made with the water management systems in the wider Mediterranean region and especially in Istanbul, where there is such infrastructure.

scholarly journals Corporate Governance and Risk Management: Lessons (Not) Learnt from the Financial Crisis

2021 ◽  
Vol 14 (9) ◽  
pp. 419
Author(s):  
Alessandro Gennaro ◽  
Michelle Nietlispach
Keyword(s):  
Risk Management ◽  
Corporate Governance ◽  
Financial Crisis ◽  
Management Practices ◽  
Management Systems ◽  
Management Approach ◽  
The Past ◽  
Corporate Governance Codes ◽  
The Usa ◽  
The Uk

The paper aims to understand if and which lessons have been learned since the financial crisis of 2007–2008, highlighting the main deficiencies which still affect the corporate governance and risk management systems more than a decade after. A survey was performed by collecting the answers to 15 questions about corporate governance and risk management practices, given by a representative sample of 200 finance professionals (100 from the USA, 50 from Italy, 50 from the UK). The survey allows saying that corporate governance codes and risk management approach, even though improved and implemented over the past decade, still present problems in terms of principles or application. The results provide insights into how corporate governance issues are addressed and how financial institutions and regulators learn and adapt from a crisis. The paper also gives new perspectives on corporate governance, indicating where regulators need to focus on to rethink the governance mechanisms.

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