Download or read book Effect of Stay N Nitrification Inhibitor Upon Corn Yield and N uptake on Iowa Soils written by Kyle Gustav Jensen and published by . This book was released on 2003 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen fertilization is necessary to obtain respectable corn yields. Loss of nitrogen applied to the soil can significantly decrease yields. Suppressing the rate of nitrogen oxidation into a form that can be leached from the root zone may increase N use efficiency. The use of a nitrification inhibitor (nitrapyrin) has been shown to protect crop yield and groundwater quality when leaching conditions exist. Two year studies were conducted to determine the efficacy of reformulated nitrapyrin (Stay-N) when used with urea-ammonium nitrate solutions (liquid N fertilizer) and liquid swine manure upon corn yields. The liquid N studies were conducted in 2000 and 2001 at the Northwest Iowa Research Farm on a Galva soil (Typic Hapludoll) and in Central Iowa at the Burkey Farm on a Nicollet soil (Aquic Hapludoll). Treatments were arranged in split-plot, randomized, complete block design replicated four times. Main plots were Stay-N treatments, with (0.56 kg ai ha−1) or without Stay-N. Sub-plots were seven different rates of nitrogen: 0, 45, 90, 135, 180, 225, and 270 kg ha−1. Stay-N was mixed with the urea-ammonium nitrate solutions and sprayed on the appropriate plots using a small plot fertilizer applicator. The liquid swine manure study was conducted in 2001 and 2002 at the Armstrong Research Farm near Lewis, Iowa on a Colo soil (Cumulic Endoaquoll). The study was arranged in a randomized complete block design replicated four times. Liquid swine manure was applied to the plots to supply 0, 90, and 179 kg ha−1 of nitrogen. Stay-N rates were 0, 0.56, 1.12, and 2.24 kg ai ha−1. Stay-N was mixed with the swine manure before treatments were injected into the soil. Environmental conditions did not favor N losses during the time the studies were conducted.

Download or read book Effect of Slow Release Nitrogen Fertilizers on Corn Production in Iowa written by Marianela González and published by . This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Slow and controlled release fertilizers have often been used to prevent N loss through leaching. Recently, new slow release fertilizers have been developed and their potential use in corn production is an alternative to increase N efficiency. An incubation study was performed to measure and compare the release rates from two urea-formaldehyde (UF) liquid resins and conventional urea. Four different representative soils from corn production areas of Iowa were collected. The soils were classified as: Harps (Typic Calciaquoll), Nicollet (Aquic Hapludoll), Okoboji (Cumulic Hapluquoll) and Sac (Oxyaquic Hapludoll). Soil samples (10 g) were amended with solutions containing rates of N equivalent to 0, 50, 100, 150 and 200 kg N ha−1 of urea and the UF materials and incubated at 20 0C for 0, 7, 15, 30, 45 and 60 days. At the end of the respective incubation periods each sample was analyzed for nitrate-N (NO3-N) and ammonium-N (NH4-N). The results obtain showed that UF fertilizers might not meet the N requirements for corn production in Iowa due to the low percentage N recoveries (60 - 80% N) observed. The soils had different release rates mainly affected by pH and organic matter content. A two year trial was conducted to asses the effect of a polymer-coated urea (ESN) fertilizer upon corn biomass and grain N uptake and yield when applied in the fall or spring. Nitrogen fertilizer rates used for urea and ESN treatments were 0, 34, 67, 101, 135, 168 and 200 kg N/ha. The results obtained showed that corn biomass was not affected by the use of ESN or urea in particular. Biomass weight and N uptake tended to respond to N rates in some treatments. Grain yield always increased with N rate. However the effect of ESN and urea application varied from one year to the next and among locations.

Download or read book Effects of Nitrification Inhibitors and N Fertilizer Placement on Corn Yield and Soil Nitrogen written by Edward H. Earles and published by . This book was released on 1985 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Residual Effects of Fall and Spring applied Nitrogen Fertilizers on Crop Yields in the Southeastern United States written by Robert W. Pearson and published by . This book was released on 1961 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen fertilizer broadcast in November or December on widely different soils at seven locations in Alabama, Georgia, and Mississippi during 1955-59 was only 49 percent as effective as nitrogen fertilizer applied the following spring when measured by corn yields. In terms of nitrogen recovered, the relative effectiveness was 62 percent. There were no consistent differences among the five nitrogen sources applied in the fall as measured by corn yields, but nitrogen recovery tended to be lower from urea than from the other sources. Considerable residual effects of spring-applied nitrogen were found over a period of 16 months based on both yield and nitrogen uptake by the crops. Average uptakes of 25 and 34 pounds per acre of additional nitrogen were made by the second and third crops, respectively, from the 200-pound original application. This residual nitrogen produced average yield increases of 1,600 pounds of dry forage and 19 bushels of corn per acre. These results emphasize the economic importance of residual nitrogen and the need for soil test procedures for its estimation.

Download or read book Evaluation of a Nitrification Inhibitor for Improving Corn Nitrogen Fertilizer Efficiency on Irrigated Sands written by Michael John Mlynarek and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Response of Corn Yield in Two Crop Rotations to Different Nitrogen Rates and Nitrapyrin written by Jose P. Quesada and published by . This book was released on 2002 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of nitrapyrin (2-chloro-6-(trichloromethyl) pyridine) is a common practice for attaining better grain yield response to ammonia-N fertilization in corn (Zea mays L.). The majority of the research that deals with use of nitrapyrin is based on studies of 2 to 3 years length. No consistent response to nitrapyrin has been observed in fine-textured soils. The objective of this study is to determine if the long-term effects of annual pre-plant, spring application of ammonia with nitrapyrin in fine-textured soils results in economic benefit when used for corn, in rotations of continuous corn and corn after soybean (Glycine max L.). Two experiments were evaluated, both located near Ames, Iowa. The first was evaluated from 1991 to 1994. Crop rotations were continuous corn and corn after soybean. Crops were planted on a Clarion Loam Soil (Fine-loamy, mixed, superactive, mesic Typic Hapludoll). The experiment was arranged as a split-plot in a randomized, complete block design with four replications. The main plot treatments were nitrapyrin rates of 0 and 0.56 kg ai ha−1. The sub-plots were N rates of 0, 45, 90, 135, and 180 kg N ha−1 for corn following soybean. For the continuous corn rotation, the N rates were 0, 56, 112, 168, and 224 kg N ha−1. The second experiment was evaluated from 1995 to 2000. Soil is a Nicollet loam (Fine-loamy, mixed, superactive, mesic Aquic Hapludoll). The experiment was a factorial arrangement of treatments in a randomized, complete block design. Crop rotations and rates of nitrapyrin and N were the same as in the previous experiment. Neither corn yield nor N-uptake were consistently affected by nitrapyrin application during the entire 10-year period of the study. Differences in post-harvest soil concentrations of NH4-N or N03−-N were rarely significantly different. No proof of environmental benefits due to application of nitrapyrin was observed. In the fine-textured Iowa soils, a possible economic benefit could be obtained from plots with coarser soil texture when using nitrapyrin combined with low rates of N fertilizer. For the fine-textured soils, no economic benefits are expected.

Download or read book Effect of Nitrogen Fertilizer on Corn Yield and Soil Nitrates written by and published by . This book was released on 1978 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Tillage and Nitrogen Rate on Soil NO3 N Levels Plant N Uptake and Yield of Corn written by Walter Bernard Gordon and published by . This book was released on 1990 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Tillage and Nitrogen Fertilization on Nitrogen Losses from Soils Used for Corn Production written by and published by . This book was released on 1990 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitrogen Management Strategies to Improve Corn Growth and Reduce Soil Greenhouse Gas Emissions from Claypan Soils written by Tyler W. Steusloff and published by . This book was released on 2018 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adoption of nitrogen (N) management strategies to minimize gaseous N loss from agriculture while maintaining high yield production is increasingly important for an exponentially growing population. Agricultural management on poorly-drained claypan soils in the Midwestern U.S. make corn (Zea mays L.) production even more challenging due to the subsoil's low permeability, which may result in wetter soil conditions and relatively larger amounts of soil N[subscript 2]O emissions during the growing season. The objective of this study was to determine the effects of urea fertilizer placement with and without the addition of a nitrification inhibitor (NI) on corn yield, N use efficiency (NUE), and cumulative soil N[subscript 2]O emissions on a Northeastern Missouri claypan soil. The fertilizer strategies utilized in this study consisted of deep-banded urea (DB) or urea plus nitrapyrin [2-chloro-6-(trichloromethyl) pyridine] (DB+NI) at a depth of 20 cm compared to urea broadcast surface applied (SA) or incorporated to a depth of 8 cm (IA). The addition of a NI with deep-banded urea resulted in 27% greater apparent N recovery efficiency than all other N treatments. Additionally, DB+NI had 54 and 55% lower cumulative soil N[subscript 2]O emissions than IA and SA treatments in the two combined growing seasons. These results suggest that deep placement of urea with or without nitrapyrin is an effective management strategy for increasing corn yield and reducing N loss on a claypan soil.

Download or read book Nitrification Inhibitor Nitrogen Source and Herbicide Effects on Soil Bitrogen Transformations and Corn Yield written by William Neels and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is the most limiting nutrient for crop production; however, its management has been challenging due to increasing nitrogen losses. Increased N losses have led researchers to focus on strategies for improving Nitrogen Use Efficiency (NUE). In this study, we took an integrated approach to compare the effects of N source, nitrification inhibitor and herbicide on nitrification, N loss, crop yield, residual N, and NUE. We first evaluated these factors in a twoyear field experiment. A laboratory soil incubation experiment followed. The treatments included a combination of nitrification inhibitor vs. no inhibitor, two nitrogen fertilizer sources (broadcast urea vs. injected aqueous ammonia), and a pre-emergence herbicide vs. no herbicide. Results indicated that nitrogen source has a more significant effect on NH4 + -N retention (78-80% higher in anhydrous ammonia vs. urea) than nitrification inhibitor (24-47% higher with inhibitor vs. without inhibitor) and herbicides. Similarly, nitrogen source significantly affected NO3 - -N formation (134-176% lower in anhydrous ammonia vs. urea) than nitrification inhibitor (8-31% lower with inhibitor vs. without inhibitor) and herbicides. We then evaluated the effect of nitrification inhibitor, nitrogen fertilizer source, and herbicide on (1) soil nitrification through a 25 day-soil incubation and (2) NH3 volatilization, NO3 - -N leaching, and N2O emissions through a 31-day soil column study using a loamy sand soil. Results indicated that nitrogen source had a greater effect on reducing nitrification (32.5% lower with injected aqueous ammonia vs. surface broadcast urea) compared to nitrification inhibitors (4% lower with inhibitor vs. without inhibitor) and herbicide (no effect). Surface broadest urea increased NH3 volatilization by 673% compared to injected aqueous ammonia. Injected aqueous ammonia had 22% higher NO3 - -N leaching and 33 % higher NH4 + -N leaching than urea, while nitrification inhibitor had an inconsistent effect on NO3 - -N leaching across both N sources. The results of both experiments indicated that nitrogen source plays a more significant role in regulating soil nitrogen losses than nitrification inhibitors and herbicide..

Download or read book Nitrogen Fertilizers for Corn written by Lloyd Dumenil and published by . This book was released on 1952 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Lack of nitrogen limits corn production on most Iowa soils. Many Iowa farmers can use nitrogen fertilizer profitably, our experiments show. As the supply increases, much more nitrogen fertilizer will be used -- on a larger number of acres and at higher rates per acre. Many of you have used nitrogen fertilizer on corn. But many more of you will be using nitrogen in the future. The Iowa Agricultural Experiment Station has conducted over 200 experiments with nitrogen fertilizer on cornfields over the state since 1943. It is the purpose of this bulletin to give you the information gathered from these experiments along with pointers to help you use nitrogen profitably on your cornfields." p. [837]

Download or read book Effect of Residual Nitrate in Soil Profiles on the Nitrogen Fertilizer Requirements of Corn written by Elizabeth Sue Malone and published by . This book was released on 1986 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Master s Theses Directories written by and published by . This book was released on 2004 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Download or read book Nitrification Inhibitors and Use in Minnesota written by Michael Schmitt and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Corn Yield Nutrient Uptake by Corn Nitrification and N serve Degradation in Soil as Affected by Applied N serve and Nitrogen written by Joseph Terry Touchton and published by . This book was released on 1981 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Nitrification and Its Relation to Crop Production on Carrington Loam Under Different Treatments written by Lewis Wilson Erdman and published by . This book was released on 1928 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: