soil nitrogen Articles
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Direct steam distillation as an alternative to the illinois soil nitrogen test
Development of the Illinois Soil N Test (ISNT) has rejuvenated the search for a soil-based N test to measure potentially mineralizable soil N. Accurate quantification of amino sugar N has been achieved using the ISNT, but issues concerning sample variability and analysis time have led to the discovery of a 10 mol L–1 NaOH direct steam distillation (DSD) procedure. Our primary objective was to ...
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Synthetic nitrogen fertilizers deplete soil nitrogen: a global dilemma for sustainable cereal production
Received for publication December 19, 2008. Cereal production that now sustains a world population of more than 6.5 billion has tripled during the past 40 yr, concurrent with an increase from 12 to 104 Tg yr–1 of synthetic N applied largely in ammoniacal fertilizers. These fertilizers have been managed as a cost-effective form of insurance against low yields, without regard to the inherent effect ...
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Enhancing phosphorus phytoremedation potential of two warm-season perennial grasses with nitrogen fertilization
Phytoremediation or use of plants to extract soil nutrients is a practice used to ameliorate the impacts of excessive soil nutrients. Pensacola bahiagrass (Paspalum notatum Flügge) and ‘Floralta’ limpograss [Hemarthria altissima (Poir.) Stapf & Hubb] were grown in a P-impacted Immokalee fine sand (Mehlich-1 P 30 mg P kg–1) to evaluate increasing N levels on dry matter yield (DMY), forage P ...
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Estimating forest soil Carbon and Nitrogen stocks with double sampling for stratification
Precise and accurate estimation of C and N in forest soils is important for monitoring long-term site productivity and C stock changes. Obtaining such estimates remains a major challenge, however, especially because of high natural variability in the forest floor. Although most researchers have used simple random sampling (SRS) for within-plot soil sampling, double sampling for stratification ...
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N-(N-butyl)thiophosphoric triamide/NBPT
Urease inhibitor is a kind of substance that can inhibit the activity of soil urease, and it is a new technology which has been studied in urea or nitrogen compound fertilizer. Using soil urease inhibitor can effectively slow decomposition of urea into ammonia process, reduce soil NH4 + and NH3 concentration, soil fertility and crop fertilizer synchronization. NBPT is the most effective inhibitor ...
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3,4-Dimethylpyrazole Phosphate Solution
Nitrification inhibitor refers to a class of chemical substances that inhibit the biotransformation of ammonium nitrogen into nitrate nitrogen (NCT). Nitrification inhibitors reduce the formation and accumulation of nitrate in soil so that it can reduce the loss of nitrogenous fertilizer in the form of nitrate nitrogen and the impacting on ecological environment. Some results show that, although ...
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Multivariate analysis and visualization of soil quality data for no-till systems
To evidence the multidimensionality of the soil quality concept, we propose the use of data visualization as a tool for exploratory data analyses, model building, and diagnostics. Our objective was to establish the best edaphic indicators for assessing soil quality in four no-till systems with regard to functioning as a medium for crop production and nutrient cycling across two Illinois ...
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Nitrogen fertilization effect on phosphorus remediation potential of three perennial warm-season forages
Warm-season C4 grasses are capable of removing excess soil nutrients because of their high yield potential and nutrient uptake efficiency. Bahiagrass (Paspalum notatum Flügge), limpograss [Hemarthria altissima (Poir.) Stapf & Hubb], and stargrass (Cynodon nlemfuensis Vanderyst), three commonly used pasture grasses in South-Central Florida, were grown to examine the effect of increasing N ...
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Observing the nitrogen cycle in a green manure trial on an organic farm
As part of a 5 year Federal Government funded Landcare project in the Gippsland area of Victoria, a number of on-farm trials have taken place. One of these trials was monitoring a range of green manures on a certified organic vegetable farm. The demonstration trialled and compared 6 different green manure crops each year for 3 years against a control. The control was immediately adjacent to the ...
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Fertilizer vs. organic matter contributions to nitrogen leaching in cropping systems of the Pampas: 15N application in field lysimeters
Abstract Nitrogen (N) export from soils to streams and groundwater under the intensifying cropping schemes of the Pampas is modest compared to intensively cultivated basins of Europe and North America; however, a slow N enrichment of water resources has been suggested. We (1) analyzed the fate of fertilizer N and (2) evaluated the contribution of fertilizer and soil organic matter (SOM) to N ...
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Types and maintenance of soil salinity sensors
Background: When people think of salt in relation to crops, the impression is that salt is bad for plant growth. However, it must be remembered that whenever we apply fertilizer, we are adding salt to the soil. So, when measuring soil salt, it can be a case of too much or too little. If the salinity is too high, the roots cannot absorb water. If the salinity is too low, the plants may lack ...
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Cover crop and nitrogen effects on maize productivity in no-Tillage Systems of the Brazilian cerrados
Cover crops in direct seeding mulch-based cropping (DMC) systems can be an effective tool to optimize N management for crop production in the Brazilian cerrados. The objective of this study was to determine the effect of four cover crops on maize (Zea mays L.) grain yields in two fields that had been under DMC for 3 and 14 yr. We hypothesized that cover crops would optimize N supply to the maize ...
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Cover Crop and nitrogen effects on maize productivity in no-tillage systems of the Brazilian Cerrados
Cover crops in direct seeding mulch-based cropping (DMC) systems can be an effective tool to optimize N management for crop production in the Brazilian cerrados. The objective of this study was to determine the effect of four cover crops on maize (Zea mays L.) grain yields in two fields that had been under DMC for 3 and 14 yr. We hypothesized that cover crops would optimize N supply to the maize ...
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Benefits of Portable soil detectors
Background: Soil is one of the most important natural resources on Earth. It plays a vital role in agriculture, supporting the growth of crops and plants and providing us with food, clothing and shelter. However, the quality of soil depends on various factors such as location, weather and environmental factors. Therefore, it is important to understand the properties of the soil before planting ...
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Agronomically Speaking: Fall Fertility? From Soil Test to Prescriptions
Farmers understand that soil fertility is a key component of growing healthy and high yielding crops. While there is much debate on how we accomplish soil fertility and health, there are some general items that are helpful to remember. However, because it was an extremely wet year for many across the country it is even more important to soil test this year. Some of the nutrients ...
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Locust Swarms Emphasise the Need for Controlled Environment Agriculture
Outbreaks of locust swarms in Africa, Asia and the Middle East have epitomised the essential need for indoor farming. Unseasonal rains caused by global warming, have aided the spread of desert locusts which would normally have died out in the dry season. Ethiopia and Somalia are currently experiencing their worst outbreak in twenty-five years, while Kenya is experiencing its worst infestation in ...
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Are you maxing out? Applying the Law of the Maximum gets the most from your fertility investment dollars
Avoid excess crop nutrients in your fertilizer strategy to maintain soil health and protect your pocketbook The push to produce higher yields per acre every year continues to weigh heavily on western Canadian farmers. That pressure is accompanied by economic and environmental concerns. Should you invest more money into crop nutrients to reach record yields? Will that investment pay off? Will ...
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Is less more? Understanding the Law of Minimum to optimize your fertilizer strategy
Identify and correct crop nutrient deficiencies in your soil to increase yield and profit Achieving prosperity in Canadian agriculture is a balancing act. While new technologies increasingly grow your potential to overcome limiting factors and boost yields, oftentimes revisiting the basics will further support your efforts to reach an optimum balance in soil nutrients. A great place to start is ...
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Likely impacts of biofuel expansion on Midwest land and water resources
US ethanol production should exceed 12 billion gallons by 2010, and EISA 2007 mandates 36 billion gallons by 2022, diverting one-third of corn to ethanol and 13% of soybean production to biodiesel. Increased demand will ricochet through other agricultural sectors and alter production patterns and land use in the Corn Belt. This paper discusses effects of biofuel expansion on land and water ...
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From Data to Action: Leveraging Soil NPK Sensor Insights for Optimal Crop Management
Optimizing Crop Yields and Resource Efficiency through Precision Agriculture In the pursuit of sustainable agriculture, precision farming has emerged as a game-changer, revolutionizing agricultural practices and fostering a more efficient and environmentally responsible approach to crop production. At the heart of precision farming lies the concept of real-time data acquisition, enabling farmers ...
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