Download or read book The Effect of Fertilizers Method of Application Plant Population and Variety Upon Yield of Corn and Utilizaton of Soil Moisture written by Earl Otis Skogley and published by . This book was released on 1957 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Effects of Method of Application of Fertilizers on Corn and Soils written by Frederick Burean Smith and published by . This book was released on 1927 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Fertilizer Nitrogen Plant Population and Variety on Yield of Continuous Corn on a Grundy Soil written by Pedro Baherle and published by . This book was released on 1978 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Fertilizers and Stand on Corn and of Stand on Soil Moisture written by Fred E. Shubeck and published by . This book was released on 1955 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of In season Fertilizer Strategies on the Yield and Nitrogen Use Efficiency of Irrigated Corn written by Alexander Soroka and published by . This book was released on 2016 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inefficient use of nitrogen (N) fertilizer in agronomic crop production can lead to water quality concerns and reduced yields for growers. Nitrogen left in the soil after crop harvest is subject to leaching losses to groundwater or gaseous losses to the atmosphere. Split additions of N via sidedressing or fertigation can better time N applications with corn N uptake and improve N use efficiency (NUE). Irrigation can also stabilize yields and raise NUE at decade time scales. The objectives of this study were to 1) quantify the effect of N rate and timing under central pivot irrigation on grain yield and N use efficiency in Delaware using a plot study and 2) investigate the impact of irrigation on yield and NUE in Delaware using historical yield data. A plot study was completed by establishing irrigated corn on well-drained soil which received zero N (control) or 6.72 Mg ha-1 poultry litter, 34 kg ha-1 starter N at planting, and 0, 82, 140, or 198 kg ha-1 of in-season N (applied at sidedress at V5 or via fertigation at V5, V8, V11, and V13). Grain yield was determined for each treatment at harvest using a weigh wagon. Pre-plant soil, post-harvest grain, residue, and in-season soil samples were collected and analyzed to allow calculation of NUE by several methods. Nitrogen application rate affected yields and NUE more than N timing and application when in-season N was applied. Yields of irrigated corn were statistically similar at N rates exceeding 82 kg ha-1; average yields over the study period were 17 Mg ha-1. Partial factor productivity of nitrogen was above 60 kg kg-1 for corn at all N rates except the highest rate. Total aboveground biomass for irrigated corn treatments receiving supplemental N generally contained more N in plant tissue (values ranged from 214 to 254 kg ha-1) than Chesapeake Bay Model Scenario Builder (SB) maximum uptake estimates of 218 kg ha-1. Mass balance estimates of NUE indicated that 13 to 49% of available N applied to plots could not be unaccounted for in plant tissue or soils. The mass balance approach illustrated a trend for increasing unaccounted for N with increasing N rate but, this was only significant in 2014. Leachate concentrations of NO3-N at 60 cm depth were highest in plots receiving supplemental N, with mean concentrations of 7 and 22 mg L-1 NO3-N in 2014 and 2015, respectively. Currently, irrigated land receives an interim credit of 4% reduction in total N in the Chesapeake Bay Model. This reduction is modeled like a filter, where irrigated corn would release 4% less N than comparable rainfed fields. Historical data from University of Delaware corn hybrid variety trials were analyzed to evaluate effects of irrigation on corn yields and NUE over time. Historical yield data and calculated NUE (from variety trials and UD field plot studies) were compared to values in the literature and those used by the Chesapeake Bay Program. In the last two decades, hybrid variety trials met and exceeded the 12.5 Mg ha-1 yield maximum value used in the Chesapeake Bay Model SB. Rainfed plots were 80 and 85% as efficient as irrigated plots in converting applied N to grain yield over the 35 year history of UD corn variety trials. A scenario indicated that irrigated corn could consume 1,030 Mg more N annually than rainfed plots if they were fertilized based on UD N rates for a realistic irrigated yield goal. Based on results of a two-year plot study at UD Warrington Irrigation Farm and analysis of 35 years of yield data from UD variety trials, we make the following preliminary recommendations: 1) lower UD N rate recommendations for high yielding irrigated corn by 15 % to account for increased NUE of irrigated corn and 2) Evaluate if irrigation's NUE would be more appropriately modeled as a separate crop category or, as a BMP. Future research should focus providing data to further refine these recommendations by quantifying NUE at a regional scale. On-farm strip trials could be conducted by UD researchers with a common protocol at multiple locations to evaluate how NUE and yields are affected by irrigation and N management. In addition, we also recommend collection and analysis of leachate and groundwater samples as part of these strip trials to determine risk of N losses at different locations under various soil and management conditions.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Plant Population and Planting of Corn on Radiation Interception and Water Use written by Iowa State University. Agronomy Department and published by . This book was released on 1961 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Fertilizer Rates Ratios and Plant Populations on Corn Yields written by Fred Elof Shubeck and published by . This book was released on 1951 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1986 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reference Guide to North Dakota History written by Dan Rylance and published by . This book was released on 1979 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 6000 citations (printed before 1976) about North Dakota history. Includes citations on geology, geography, natural history, conservation, climate, forts, Indians, military, exploration, fur trade, Dakota Territory, government, politics, wars, the counties and cities, education, religion, sports, women, health, agriculture, business, transportation, etc.
Download or read book The Effects of Genotypes Fertilizer and Plant Population on the Yield of Corn written by Rusli Marah Hakim and published by . This book was released on 1965 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method of Economic Analysis Applied to Nitrogen Fertilizer Rate Experiments on Irrigated Corn written by James Leo Paschal and published by . This book was released on 1956 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by and published by . This book was released on 1971 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilizer Abstracts written by and published by . This book was released on 1969 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1987-10 with total page 1238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Resources Research Catalog written by and published by . This book was released on 1966 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1985 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
