Groundwater

Nebraska Extension will host a Nitrogen Sources and Water Quality Field Day on August 13, 2024, from 9:30 a.m. to 2:30 p.m., at the Haskell Ag Lab near Concord, NE.

This year's 4Rs Field Day will feature a demonstration on UNL's newly developed web-based N tool, designed to increase efficiency of nitrogen use, as well as ease of record-keeping.

Nitrogen is an essential plant nutrient but increasingly found in our water. Here is a brief history:

It’s that time of year again and I’m here to help you stay on track for that New Year’s resolution to “Manure Better”. That wasn’t your resolution? I’m sorry, but it would be a great resolution and an achievable one at that, so add it to your list. My New Year’s resolution is to help crop farmers “Manure Better”. The annual land application (manure) training events are coming up soon and may be just the ticket to “help me, help you”.

Scheduling the last few irrigations of the season deserves extra attention because the goal is not only to focus on keeping the crop wet enough to produce optimal yields, but also on using up stored soil water. Leaving the field a little drier at the end of the season will save irrigation costs, decrease leaching losses, improve soil conditions for harvest traffic, and save water for future years. Growers also don't want to miss out on capturing off-season precipitation.

Access to quality water is critical. Testing can indicate whether water is safe for people to consume. Know Your Well is a program used to test well water across Nebraska at no cost to the community, while teaching local high school students valuable skills. In the past seven years, Know Your Well has been implemented in more than 28 school districts throughout the state. The program has received funding to grow to 50 or more schools over the next few years and expand its curriculm.

Agriculture today is not what it was a decade ago. We are at an interesting pace of agricultural technological innovation and development in sensors, controls, robotics and technology, including irrigation scheduling applications. The declining quantity and quality of freshwater resources in many parts of the world, including the United States, imposes significant challenges for producers, managers, advisors and decision-makers to produce more yield with less water. It is necessary to promote sound management strategies to improve irrigation efficiency and conserve water resources. By using irrigation scheduling applications, producers can make more informed decisions that can lead to higher yields with fewer irrigation inputs. Nebraska is one of the top states that produces maize under different irrigation methods, in third place after Iowa and Illinois. The total irrigated area in Nebraska reaches about 9.3 million acres. More than 85% of the total irrigation areas use the center pivot irrigation system, while about 15% is covered by furrow irrigation and less than 1% is managed by subsurface drip irrigation systems (see fig. 1). A new irrigation scheduling application is being developed to improve irrigation scheduling that can have a substantial impact in using limited water supplies more effectively and increase yield per unit applied of irrigation water and sustain agricultural productivity. At the request of Irriga Global, Lutry, Switzerland, a field test was initiated for the 2022 growing season on maize fields to evaluate the irrigation scheduling application in one of the Irrigation Today.

How nitrogen moves and is changed in the soil is important to help protect Nebraska's groundwater from contamination. However, these changes are not fully understood. To help understand these processes, a research team led by Dr. Arindam Malakar, scientist and research assistant professor in the School of Natural Resources and the Nebraska Water Center part of the Daugherty Water for Food Global Institute at the University of Nebraska-Lincoln, has begun a statewide study to uncover nitrogen transformation in the vadose zone. Continue reading about their project across Nebraska.

Nebraska is no stranger to dry spells, especially during the summer months. Unfortunately, we have been experiencing longer year-round dry spells in recent years that are becoming more severe to deal with. While using water more efficiently is always a good habit to adopt, it becomes more critical during times of drought, even if restrictions are not mandatory yet.

The Soil Health Nexus is excited to debut two new resources on the Soil Health Toolbox! Two Soil Health Nexus members, Francisco Arriaga, Associate Professor and Extension Specialist at the University of Wisconsin-Madison, and Anna Cates, Assistant Professor and State Soil Health Specialist at the University of Minnesota, recently published a long-awaited whitepaper exploring the connection between soil health and water quality.

Extension recommendations for calculating the amount of nitrate-nitrogen in irrigation water and optimal timing of applications to reduce the cost of nitrogen inputs in irrigated corn.

This year's conference will focus on innovative ways to improve water and food security by increasing farmers’ resiliency to a changing landscape.

This UNL research study provides insights on the rotation of annual crops with alfalfa as a highly effective means of reducing nitrate-nitrogen contamination in groundwater.

According to study from Department of Natural Resources researchers, irrigation pivots stained with rust may indicate the absence of nitrate in the groundwater supplying the pivots. This information can potentially be used to help screen for areas for the potential absence of nitrate and, in an ideal world, could indicate areas at higher- or lower-risk for nitrate contamination before it becomes a problem.

Photo Credit: Craig Chandler | University Communication and Marketing A majority of respondents to the 2022 Nebraska Rural Poll indicated they were at least somewhat concerned about contaminants in their water supply that could impact their own or their family’s health. About 45% reported they had had their water tested for nitrates, E. coli, lead, pesticides or other contaminants.

In Nebraska, extreme winter weather can hit us quickly and hang around for extended periods of time. Long periods of cold can be hard on things, but what impact do they have on your septic system, private well/water system? Are there things one can do to minimize the impact?

Photo Credit: Becky Schuerman Odors that are comparable to that of rotten eggs are not ideal in your home or coming from your drinking water faucet. Sulfate, which is a combination of sulfur and oxygen, are naturally occurring minerals. They are found in some soil and rock formations where groundwater is stored. Bacteria that feed on sulfur can produce hydrogen sulfide gas which is the primary offender when it comes to odor. 

At the end of the season, a nitrate test can help determine whether the crop was under-, adequately or over-fertilized with nitrogen, resulting in the potential to significantly reduce input costs.