Download or read book Simulation of Grain Sorghum Nitrogen Response written by Lemma Zewdie and published by . This book was released on 1999 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yield Response and Economic Impact of Variable rate Nitrogen Applications in Grain Sorghum written by Jarrett Daniel Riffel and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Variable-rate (VR) nitrogen (N) applications have the potential to improve efficiency of grain sorghum production. Field experiments were conducted in 2010 and 2011 in Stockton and Manhattan, KS. Four VR-N prescriptions were generated using various combinations of grid soil sampling data, soil electrical conductivity (EC) data, and yield maps, and were compared in the field with a uniform application based on a composite soil sample and whole field average yield goal. Soil EC data were used to create management zones that were individually soil sampled. Prescriptions were applied before planting and grain sorghum was harvested and recorded with a yield monitor in the fall. Grain sorghum yields responded to N at both sites with a higher response in 2010 due to more precipitation during the growing season. At Stockton in both years, greatest yields and returns were realized with prescription 4, a combination of management zone soil data and spatially-variable yield goal, while the smallest yields were realized with prescription 2 based on management zone soil data and field average yield goal. Prescription 5, which used grid-soil sampling and a spatially-variable yield goal, and prescription 2 resulted in the lowest returns in both years. At Manhattan in both years, greatest yields and returns were realized with prescription 3, combining a composite soil sample with spatially-variable yield goal. Prescription 5 was among the lowest returning treatments in both years. At Stockton, there was no correlation between yield and soil EC during the 2010 growing season, however there was a significant correlation between yield and shallow EC during the drier 2011 season. At Manhattan, yield was correlated to deep EC in 2010 and to shallow EC in 2011. Overall, increasing spatial intensity of data to develop the prescriptions did not necessarily result in an increased yield response to the application. Prescriptions that included a variable yield goal component tended to perform better across both sites and years.
Download or read book The Correlation of Soil Test Values with Cotton and Grain Sorghum Yield Response to Nitrogen and Phosphorus on the Southern High Plains of Texas written by Joe Tackett Ritchie and published by . This book was released on 1961 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Nitrogen Fertilization Practices of Wheat Farmers in Mexico s Yaqui Valley written by Beatriz Avalos Sartorio and published by . This book was released on 1997 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain Sorghum Production with Different Nutrients Populations and Irrigation Frequencies written by H. D. Fuehring and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaf Composition and Soil Properties for Evaluating the Response of Grain Sorghum to Fertilizer Nitrogen and Phosphorus written by James Lester Bourg and published by . This book was released on 1961 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Managing Nitrogen in Grain Sorghum to Maximize N Use Efficiency and Yield While Minimizing Producer Risk written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain Sorghum (Sorghum bicolor) is one of the most drought and stress tolerant crops grown in Kansas. For this reason, much of the sorghum is grown in high risk environments where other crops are more likely to fail or be unprofitable. Efficient sorghum cropping systems should not only produce high yields and use inputs such as nitrogen efficiently, but they should also remove as much risk as possible for a successful crop, and give farmers more flexibility in making input decisions. The price of nitrogen (N) fertilizer has increased substantially in recent years. Current retail prices for commonly used N fertilizers range from $0.88 to $1.50 per kilogram of N in Kansas. Thus, a farmer could easily invest $50-$100 per hectare in N, depending on the rate of N needed and the source used. Practices which allow farmers to assess crop potential as late as possible after planting before applying costly inputs like fertilizer, can increase the potential for a profitable return on those inputs in risky environments. Currently, most sorghum growers routinely apply all the N fertilizer prior to planting, sometimes as much as 6 months prior. The current Kansas State University (KSU) nitrogen recommendation is yield goal based and performs well when the grower is able to predict yield six months or more in advance of harvest. However, yield is quite variable and difficult to predict. Because long range weather and yield predictions are not very reliable, could deferring making N application decisions until later in the season when yield can be more accurately predicted reduce risk? Can the use of active sensors provide a better estimate of yield potential and nitrogen needs sometime after planting? If they can, how late can the decision be made and how best should the fertilizer N be applied? Several studies were conducted throughout Kansas to look at the effect of N rate, N application timing (pre-plant, side dress, or combinations of the two) and method of application on sorghum yield and N use efficiency. The studies were also designed to examine the potential of using optical sensors to predict optimum N rate for post-planting applications as a means of avoiding the use of soil tests to estimate soil N contributions. The objectives of this research were: a. to validate the KSU N fertilizer recommendations for grain sorghum grown in rotation with crops such as soybeans and wheat, b. to determine the effect of both preplant and midseason N applications on the growth and yield potential of grain sorghum, and to determine the optimal timing and method for midseason N applications on grain sorghum, and, c. to assess the potential of optical sensing of the growing crop to refine N recommendations using in-season applications during the growing season. This thesis will summarize the results from the various experiments we completed to achieve these objectives. The KSU N fertilizer recommendations for grain sorghum may need some revisions. This research suggests that including coefficients relating to N use efficiency may be necessary to get more accurate N recommendations. Both pre-plant and midseason N applications increased the yield of grain sorghum whenever a response to N was observed. There was no negative effect of applying all the nitrogen midseason at 30-40 days after planting when compared to pre-plant applications. Injecting nitrogen fertilizer below the soil surface had higher yields than other methods of midseason N applications such as surface banding or surface broadcasting, especially when a significant rainfall event did not occur within a few days of application. The optical sensors used in this study were very effective at making N recommendations 30-40 days after planting. These sensors will provide for more accurate N recommendations compared to the current soil test and yield goal method.
Download or read book Soil Compaction in Crop Production written by B.D. Soane and published by Elsevier. This book was released on 2013-10-22 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a global review of the mechanisms, incidence and control measures related to the problems of soil compaction in agriculture, forestry and other cropping systems. Among the disciplines which relate to this subject are soil physics, soil mechanics, vehicle mechanics, agricultural engineering, plant physiology, agronomy, pedology, climatology and economics. The volume will be of great value to soil scientists, agricultural engineers, and all those involved with irrigation, drainage and tillage. It will help to facilitate the exchange of information on current work throughout the world, as well as to promote scientific understanding and stimulate the development, evaluation and adoption of practical solutions to these widespread and urgent problems.
Download or read book Quantifying and Understanding Plant Nitrogen Uptake for Systems Modeling written by Liwang Ma and published by CRC Press. This book was released on 2008-08-27 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses New Advancements to Improve Existing Simulations of Plant NitrogenWritten by research pioneers and leading scientists in the area of agricultural systems, Quantifying and Understanding Plant Nitrogen Uptake for Systems Modeling comprehensively covers plant N uptake in agricultural system models, especially for building soil-plant system m
Download or read book Influence of Nitrogen on Weed Growth and Competition with Grain Sorghum written by Bryan Jacob Unruh and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen (N) fertilizer intended for the crop may benefit highly competitive weeds to the detriment of the crop. A field experiment was conducted in 2009 to determine the influence of increasing N fertilizer rates and increasing Palmer amaranth densities on weed biomass and grain sorghum biomass and yield. Three rates were 0, 67, and 134 kg N ha−1 and natural populations of Palmer amaranth were thinned to densities of 0, 0.5, 1, 2, 4, and 8 plants m−1 of row. Palmer amaranth biomass increased as weed density and N rates increased. Weed-free grain sorghum yields were similar across all three N rates, and parameter estimates of yield across Palmer amaranth densities were not different between N rates. Based on the parameter estimates from the rectangular hyperbola model, initial slope (I) as density approached zero was 16%. Maximum expected yield loss (A) at high Palmer amaranth densities was 68%. Palmer amaranth showed a high response to N and the higher N rate increased the ability of the weed to reduce grain sorghum yield. A greenhouse experiment was conducted to determine the influence of six N rates on growth of six selected plant species, including grain sorghum, soybean, yellow foxtail, velvetleaf, Palmer amaranth and shattercane. Covariance analysis was performed with N rate as a covariate. Biomass of all species increased as N rate increased in both runs of the study. Soybean responded the least to N rate of all species in regards to biomass, height and leaf area production. In the first run, the biomass of three grass species (grain sorghum, yellow foxtail, shattercane) had similar estimates of slope and intercept of biomass across N rates. In the second run, the biomass slopes of grain sorghum and shattercane differed from soybean and were the only slopes that differed between species. Palmer amaranth had the highest rate of response as N increased but slopes of height were similar for Palmer amaranth, grain sorghum and shattercane. Soybean leaf area slopes were different from grain sorghum, yellow foxtail, and velvetleaf, but all other slopes were not different among species. Addition of N to grain sorghum increased weed growth and resulted in more yield loss as a result of weed density. The greenhouse study demonstrated that grain sorghum and Palmer amaranth increased in response similarly to the addition of N. Alternative N fertilizer management could play a role in minimizing Palmer amaranth impacts in grain sorghum production.
Download or read book An Economic Evaluation of Experimental Response of Irrigated Grain Sorghum to Nitrogen on Pullman Soils in the High Plains of Texas written by Alfred D. L. Byrd and published by . This book was released on 1960 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Screening for Drought and PH Tolerance and Response to Nitrogen Applications of Selected Grain Sorghum Genotypes written by Alassane Maiga and published by . This book was released on 1991 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Dryland Grain Sorghum to Planting Date Cultivar Planting Densities and Placement of Labeled Fertilizer Nitrogen on Yield and Water Use Efficiency written by Satish Reddy Ambati and published by . This book was released on 2004 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sorghum written by Ignacio A. Ciampitti and published by John Wiley & Sons. This book was released on 2020-01-22 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sorghum is among the top five cereals and one of the key crops in global food security efforts. Sorghum is a resilient crop under high-stress environments, ensuring productivity and access to food when other crops fail. Scientists see the potential of sorghum as a main staple food in a future challenged by climate change. The contributors provide a comprehensive review of sorghum knowledge. The discussion covers genetic improvements, development of new hybrids, biotechnology, and physiological modifications. Production topics include water and nutrient management, rotations, and pest control. Final end uses, sorghum as a bioenergy crop, markets, and the future of sorghum are presented. IN PRESS! This book is being published according to the “Just Published” model, with more chapters to be published online as they are completed.
Download or read book Texas Coastal Bend Grain Sorghum Producers Fertilizer Decisions Under Uncertainty written by Sivagnanaratnam Sriramaratnam and published by . This book was released on 1985 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Stress Day Concept to Improve Nitrogen Fertilizer Utilization written by D. E. Kissel and published by . This book was released on 1975 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study were 1) to describe the yield of continuous grain sorghum in the Texas Blackland Prairie as a function of applied nitrogen (N) and degree of water deficit under field conditions and 2) to use this information to obtain a more accurate N fertilizer recommendation in the Texas Blackland Prairie based on a knowledge of available soil water at the time of fertilizer application. An economic analysis described by Heady (1956) was used to compute optimum N rates under different degreed of soil water deficit. Water deficit was defined in terms of stress days, computed by summing the term (1-E/E) over daly intervals, where E is daily evapotranspiration rate an E is the daily potential evapotranspiration rate above the plant canopy. Cumputer simulation of soil water (...).
Download or read book The Responses of Grain Sorghum to Nitrogen Fertiliser anhydrous Ammonia at North Star NSW written by Rebecca J. Doolin and published by . This book was released on 1999 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sorghum fertiliser trial; hybrid grain sorghum.
