scholarly journals Model Based Study of Crop Evapotranspiration under Canopy Shading

Agronomy ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 334 ◽  
Author(s):  
Qiang Yu ◽  
Krishna Shah ◽  
Dong Wang ◽  
Yanbao Ma ◽  
Zhifeng Wang
Keyword(s):  
Irrigation Water ◽  
Environmental Variables ◽  
Large Fraction ◽  
The United States ◽  
Crop Evapotranspiration ◽  
Central Idea ◽  
Promising Strategy ◽  
Crop Field ◽  
Agricultural Regions ◽  
New Strategies

California has some of the key agricultural regions in the United States. One of these key regions, San Joaquin Valley, frequently experiences severe droughts leading to shortage of irrigation water. This has a significant impact on the agricultural based economy of the region. It is imperative to develop new strategies to reduce overall water consumption in agriculture without affecting crop yield. A large fraction of irrigation water is lost due to the evapotranspiration (ET) process in the crops and the soil. The classical Penman-Monteith model has been used in the present work to analyze the effect of different environmental variables and water saving strategies on the ET. Some of the scenarios considered show potential for significant water savings without much reduction in the amount of sunlight available to facilitate crop growth. The central idea considered in this study is the use of canopy shading to cover the crop field resulting in reduction in the ET. Among the strategies considered, the most promising strategy is to partially cover the crop field for a certain part of the day by employing a partially covering retractable canopy. Based on numerical calculations, total reduction in ET is calculated to be 37% from June to August for the partially covering retractable canopy.

Case Studies, Trade War Impacts Between USA And China : The Decline Of Cotton Carded Yarn 32/1 Selling Volume To China On Dan Liris Incorporation

2020 ◽  
Vol 11 (1) ◽  
pp. 91-91
Author(s):  
Riza Indah Pramesti A.Md ◽  
Avina Utari A.Md
Keyword(s):  
Mixed Method ◽  
Swot Analysis ◽  
The United States ◽  
External Factors ◽  
Sales Volume ◽  
Employee Welfare ◽  
Analysis Technique ◽  
Trade War ◽  
Conducting Research ◽  
New Strategies

This study aims to describe the prospect of the trend of export sales volume of 32/1 cotton carded yarn in PT Dan Liris. In 2018, the volume of exports of 32/1 cotton carded yarn to China dropped dramatically to zero orders. In addition, research on the decline in the sales volume of exports of 32/1 cotton carded yarn to China aims to find out deeply the flow of the company's external factors, namely trade war which caused a decline in the volume of export sales to China at PT Dan Liris. The method used in this study is a mixed method by providing an overview of the problems that occur in the PT Dan Liris company. The analytical tool in this study is the trend analysis technique by giving an overview of the trend in volume and the prospect of possible future export volumes of yarn products. The results of the analysis of the data obtained are the volume of export sales of PT Dan Liris yarn to China that are upside down or unstable. This study also succeeded in revealing that the existence of external factors in the trade war that occurred between the United States and China was very detrimental to the company in terms of income and continuity of production. Based on the results of the analysis of the data, the authors then conducted a SWOT analysis matrix as the company's alternative. The author suggests 12 new strategies that can be done by PT Dan Liris such as PT Dan Liris can take action by utilizing promotional services either online or offline, conducting research and analyzing the development of buyer countries related to economic issues on a regular basis, as well as the likely impact on the company. A survey of customer satisfaction and attention to employee welfare is also very important to maintain the integrity of the company. Keywords: Sales Volume, Trade War, Company Integrity.

scholarly journals Production and water yield of cauliflower under irrigation depths and nitrogen doses

2019 ◽  
Vol 23 (8) ◽  
pp. 561-565
Author(s):  
Reginaldo M. de Oliveira ◽  
Rubens A. de Oliveira ◽  
Sanzio M. Vidigal ◽  
Ednaldo M. de Oliveira ◽  
Lorença B. Guimarães ◽  
...  
Keyword(s):  
Water Depth ◽  
Irrigation Water ◽  
Water Yield ◽  
Crop Evapotranspiration ◽  
Fresh Weight ◽  
Randomized Design ◽  
Mean Diameter ◽  
Irrigation Depth ◽  
Completely Randomized Design ◽  
Water Depths

ABSTRACT Cauliflower is a brassica produced and consumed in Brazil, whose cultivation depends on the adequate supply of water and nutrients. The objective of this study was to evaluate the effect of irrigation depths and nitrogen doses on the production components and water yield of cauliflower hybrid Barcelona CMS. The treatments consisted of five irrigation water depths (0, 75, 100, 125 and 150% of the crop evapotranspiration) combined with five nitrogen doses (0, 75, 150, 300 and 450 kg ha-1). The experiment was conducted in a completely randomized design with a split-plot arrangement. The effects of these factors were evaluated using the response surface methodology. The water yield of the crop decreases with increasing irrigation water depth; therefore, the yield is higher when water replenishment is lower than the recommended. The highest estimated total inflorescence yield is 24,547.80 kg ha-1, with a inflorescence mean diameter of 19.60 cm, a inflorescence mean height of 12.25 cm, and an inflorescence fresh weight of 858.90 g plant-1, obtained with an irrigation water depth equivalent to 132.09% of the crop evapotranspiration (ETc) and a nitrogen dose of 450 kg ha-1. The highest inflorescence diameter and height are obtained with an irrigation depth equivalent to 128.70 and 108.20% of ETc, respectively, and a nitrogen dose of 450 kg ha-1. Therefore, the best productivity response of the Barcelona CMS cauliflower hybrid can be obtained using an irrigation depth greater than the crop evapotranspiration, regardless of the nitrogen doses.

Incorporating Additional Tree and Environmental Variables in a Lodgepole Pine Stem Profile Model

1993 ◽  
Vol 8 (3) ◽  
pp. 86-90
Author(s):  
John C. Byrne
Keyword(s):  
Environmental Variables ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Linear Equations ◽  
The United States ◽  
National Forest ◽  
Data Sets ◽  
Tree Form ◽  
Northern Rocky Mountains ◽  
Profile Model

Abstract A new variable-form segmented stem profile model is developed for lodgepole pine (Pinus contorta) trees from the northern Rocky Mountains of the United States. I improved estimates of stem diameter by predicting two of the model coefficients with linear equations using a measure of tree form, defined as a ratio of dbh and total height. Additional improvements were obtained by fitting this model to individual national forest data sets. Other tree and environmental variables tested but found of little use in improving stem profile estimates were crown ratio, habitat series, elevation, slope percent, and aspect. West. J. Appl. For. 8(3):86-90.

scholarly journals Enteric Viruses and Pepper Mild Mottle Virus Show Significant Correlation in Select Mid-Atlantic Agricultural Waters

2021 ◽  
Author(s):  
Brienna L. Anderson-Coughlin ◽  
Shani Craighead ◽  
Alyssa Kelly ◽  
Samantha Gartley ◽  
Adam Vanore ◽  
...  
Keyword(s):  
United States ◽  
Surface Waters ◽  
Irrigation Water ◽  
Water Samples ◽  
Enteric Viruses ◽  
The United States ◽  
Mottle Virus ◽  
Pepper Mild Mottle Virus ◽  
Atlantic Region ◽  
Viral Pathogen

Enteric viruses (EV) are the largest contributors to foodborne illness and outbreaks globally. Their ability to persist in the environment, coupled with the challenges experienced in environmental monitoring create a critical aperture through which agricultural crops may become contaminated. This study involved a seventeen-month investigation of select human enteric viruses and viral indicators in non-traditional irrigation water sources, surface and reclaimed waters, in the Mid-Atlantic region of the United States. Real-time quantitative PCR was used for detection of Aichi virus, hepatitis A virus, noroviruses GI and GII. Pepper mild mottle virus (PMMoV), a common viral indicator of human fecal contamination, was also evaluated along with atmospheric (air and water temperature, cloud cover, and precipitation 24 h, 7 d and 14 d prior to sample collection) and physicochemical (dissolved oxygen, pH, salinity and turbidity) data to determine if there were any association between EV and measured parameters. EV were detected more frequently in reclaimed waters (32%, n=22) than in surface waters (4%, n=49) similar to PMMoV detection frequency in surface (33%, n=42) and reclaimed (67%, n=21) water. Our data show a significant correlation between EV and PMMoV (R2=0.628; p<0.05) detection in reclaimed water samples, but not in surface waters (R2=0.476; p=0.78). Water salinity significantly affected the detection of both EV and PMMoV (p<0.05) as demonstrated by logistic regression analyses. These results provide relevant insights into the extent and degree of association between human enteric (pathogenic) viruses and water quality data in Mid-Atlantic surface and reclaimed waters as potential sources for agricultural irrigation. IMPORTANCE Microbiological analysis of agricultural waters is fundamental to ensure microbial food safety. The highly variable nature of non-traditional sources of irrigation water are particularly difficult to test for the presence of viruses. Multiple characteristics influence viral persistence in a water source as well as affect the recovery and detection methods which are employed. Testing for a suite of viruses in water samples is often too costly and labor intensive, making identification of suitable indicators for viral pathogen contamination necessary. The results from this study address two critical data gaps: enteric virus prevalence in surface and reclaimed waters of the Mid-Atlantic region of the United States and subsequent evaluation of physicochemical and atmospheric parameters used to inform the potential for use of indicators of viral contamination.

scholarly journals Groundwater use for irrigation – a global inventory

2010 ◽  
Vol 7 (3) ◽  
pp. 3977-4021 ◽  
Author(s):  
S. Siebert ◽  
J. Burke ◽  
J. M. Faures ◽  
K. Frenken ◽  
J. Hoogeveen ◽  
...  
Keyword(s):  
Water Use ◽  
Irrigation Water ◽  
Water Cycle ◽  
The United States ◽  
Major Step ◽  
Groundwater Use ◽  
Irrigation Water Use ◽  
Global Inventory ◽  
Consumptive Water ◽  
Water Uses

Abstract. Irrigation is the most important water use sector accounting for about 70% of the global freshwater withdrawals and 90% of consumptive water uses. While the extent of irrigation and related water uses are reported in statistical databases or estimated by model simulations, information on the source of irrigation water is scarce and very scattered. Here we present a new global inventory on the extent of areas irrigated with groundwater, surface water or non-conventional sources, and we determine the related consumptive water uses. The inventory provides data for 15 038 national and sub-national administrative units. Irrigated area was provided by census-based statistics from international and national organizations. A global model was then applied to simulate consumptive water uses for irrigation by water source. Globally, area equipped for irrigation is currently about 301 million ha of which 38% are equipped for irrigation with groundwater. Total consumptive groundwater use for irrigation is estimated as 545 km3 yr−1, or 43% of the total consumptive irrigation water use of 1 277 km3 yr−1. The countries with the largest extent of areas equipped for irrigation with groundwater, in absolute terms, are India (39 million ha), China (19 million ha) and the United States of America (17 million ha). Groundwater use in irrigation is increasing both in absolute terms and in percentage of total irrigation, leading in places to concentrations of users exploiting groundwater storage at rates above groundwater recharge. Despite the uncertainties associated with statistical data available to track patterns and growth of groundwater use for irrigation, the inventory presented here is a major step towards a more informed assessment of agricultural water use and its consequences for the global water cycle.

scholarly journals Quantifying the Impacts of Compound Extremes on Agriculture and Irrigation Water Demand

2020 ◽  
Author(s):  
Iman Haqiqi ◽  
Danielle S. Grogan ◽  
Thomas W. Hertel ◽  
Wolfram Schlenker
Keyword(s):  
Heat Stress ◽  
Water Stress ◽  
Irrigation Water ◽  
Water Demand ◽  
Crop Production ◽  
Crop Yields ◽  
Fold Increase ◽  
The United States ◽  
Food Prices ◽  
Irrigation Water Demand

Abstract. Agricultural production and food prices are affected by hydroclimatic extremes. There has been a large literature measuring the impacts of individual extreme events (heat stress or water stress) on agricultural and human systems. Yet, we lack a comprehensive understanding of the significance and the magnitude of the impacts of compound extremes. Here, we combine a high-resolution weather product with fine-scale outputs of a hydrological model to construct functional indicators of compound hydroclimatic extremes for agriculture. Then, we measure the impacts of individual and compound extremes on crop yields focusing on the United States during the 1981–2015 period. Supported by statistical evidence, we confirm that wet heat is more damaging than dry heat for crops. We show that the average damage from heat stress has been up to four times more severe when combined with water stress; and the value of water experiences a four-fold increase on hot days. In a robust framework with only a few parameters of compound extremes, this paper also improves our understanding of the conditional marginal value (or damage) of water in crop production. This value is critically important for irrigation water demand and farmer decision-making – particularly in the context of supplemental irrigation and sub-surface drainage.

Modern Rebels?

2014 ◽  
Author(s):  
Niall Whelehan
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
The United States ◽  
Irish Nationalism ◽  
Revolutionary Violence ◽  
Different Types ◽  
Revolutionary Movements ◽  
New Strategies

This chapter explores different types of revolutionary violence adopted by Irish nationalists in Ireland and the Irish diaspora in the nineteenth century. Due to the limitations of past rebellions, militant nationalists sought to adopt new strategies that embraced science and modernity. This led to the adoption of an urban-bombing campaign in the 1880s carried out by networks of militants across Ireland, Europe, and the United States. Far from being peculiar to Irish nationalism, these violent strategies found parallels with other revolutionary movements in Europe and the United States.

Using a Digital Meditation Application to Mitigate Anxiety and Sleep Problems in Children with ADHD

2021 ◽  
pp. 108705472110256
Author(s):  
Ronna Fried ◽  
Maura DiSalvo ◽  
Abigail Farrell ◽  
Joseph Biederman
Keyword(s):  
Sleep Problems ◽  
The United States ◽  
Beck Anxiety Inventory ◽  
Sleep Habits ◽  
Children With Adhd ◽  
Promising Strategy ◽  
Children’S Sleep Habits Questionnaire ◽  
Mindfulness Interventions ◽  
Children’S Sleep ◽  
Reducing Stress

Objective: ADHD affects 11% of children in the United States and is associated with significant levels of anxiety. Although the literature supports mindfulness-based interventions as a promising strategy for managing anxiety, it falls short in the feasibility of digital mindfulness interventions. Method: This study investigated the usefulness of the pediatric version of Headspace, a digital mindfulness program, for reducing stress in 18 children with ADHD. We conducted a 4-week pilot study to evaluate the Headspace digital mindfulness application for children ages 6 to 12 with ADHD. Parents completed the Beck Anxiety Inventory and the Children’s Sleep Habits Questionnaire at baseline and endpoint. Results: Participants had an average age of 9.2 years and were 78% male. The Headspace intervention significantly reduced anxiety and sleep problems in children with ADHD. Conclusion: Children with ADHD and comorbid anxiety and/or sleep problems could benefit from a digitally based meditation application. (J. of Att. Dis. XXXX; XX(X) XX-XX)

New Era, New Media, and New Strategies for Cross-Cultural Collaborative Learning

2012 ◽  
pp. 381-394 ◽  
Author(s):  
Chun-Min Wang ◽  
Jinn-Wei Tsao ◽  
Gretchen Bourdeau Thomas
Keyword(s):  
United States ◽  
Instructional Design ◽  
Action Research ◽  
Collaborative Learning ◽  
New Media ◽  
Web 2.0 ◽  
The United States ◽  
Cross Cultural ◽  
New Era ◽  
New Strategies

The purpose of this chapter is to share a cross-cultural project between Taiwan and the United States for educational practitioners. Taking advantage of Web 2.0 applications as facilitators, the project served as action research to discover better strategies for conducting online cross-cultural collaboration. Specifically, the authors describe the evolution of the instructional design of the project and the difficulties encountered during the cross-cultural collaboration.

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