Yields and nutrient relationships of corn grown in small grain-legume cover crops

Rising energy costs and high soil erosion losses are causing many farmers in West Tennessee to turn to no-tillage methods of production. This study, con-ducted during the growing season of 1980 at Milan, Tennessee, evaluated the effects of utilizing a legume in the no-till mulch on the growth, yield, and nutrient relationships of corn (Zea mays L.). Corn planted into a hairy vetch (Vicia villosa Roth.) and wheat (Triticum aestivum L.) mixture under both conventional and no-tillage was compared to no-tillage into a wheat alone mulch and to a check plot consisting of corn grown by conventional tillage into bare ground. These four treatments were compared at rates of 56, 112, and 168 kg/ha of nitrogen as NH4NO3. Tissue samples for dry matter weight and elemental analysis were taken of the wheat and wheat-vetch cover crops before corn planting and of the corn at five dates during the growing season. The corn was planted on April 30 and harvested September 12. The dry matter yield and N content of the wheat-vetch cover crop was lower than expected. This resulted in a very low N contribution from the mulch. Stover weight values were similar for all treatments across sampling dates at the non-zero N rates and the rate of dry matter production declined during the latter part of the growing season. These results reflect the severe moisture stress during this period. There appeared to be some immobilization of N under the no-till mulches. The WNT (wheat, no-tillage) treatment required the most supplemental N fertilization to reach its yield maximum. Also, the stover dry matter yield of both no-till treatments was lower than the conventional during the early part of the growing season. The analysis of variance for grain yields indicates that tillage was necessary to release the legume N and that there did not appear to be any priming effect from the addition of inorganic fertilizer N. These conclusions follow from the significant F value for the WVC vs. WVNT comparison and its insignificant interaction with N rates. Stover N content was significantly increased by additional fertilizer N. In some comparisons between treatments and between N rates, when dry matter and grain production were low there was a concomitant increase in the N content of the stover. There were significant decreases in the P and K percentages of the stover as the supplemental N rate was increased. These percentages also declined with increas-ing dry matter production. A concentration effect caused by low dry matter production at the low N rates during the first half of the growing season resulted in significantly higher stover P% values for the no-tillage treatments. A comparison of the data on stover yield and phosphorus uptake reveal that the wheat-vetch residue released available phosphorus at the 0 and 56 kg/ha N rates under both tillage situations

Agreement Between the Stages Cycling and SRM Powermeter Systems during Field-Based Off-Road Climbing.

The aim of this study was to determine the agreement between two portable cycling powermeters for use doing field based mountain biking. A single participant performed 15 timed ascents of an off-road climbs. The participants bicycle was instrumented with Stages Cycling and SRM powermeters. Mean and peak power output and cadence were recorded at 1 s intervals by both systems. Significant differences were determined using paired t-tests, whilst agreement was determined using 95% ratio limits of agreement (LoA). Significant differences were found between the two systems for mean power output (p<.001), with the Stages powermeter under reporting power by 8 % compared to the SRM. LoA for mean power output were 0.92 ×÷ 1.02 (95% LoA = 0.90 – 0.93). Peak power output was also significantly lower with the Stages powermeter (p=.02) by 5 % when compared to the SRM powermeter. LoA for peak power output were 0.94 ×÷ 1.09 (95% limits of agreement = 0.87 – 1.03). Significant differences were found for mean cadence between the two powermeters (p=.009), with LoA being 0.99 ×÷ 1.01 (95% limits of agreement = 0.99 – 1.00). This study found that though the Stages Cycling powermeter provided a reliable means of recording power output and cadence, the system significantly underestimated mean and peak power output when compared with the SRM system. This may in part be due to differences in strain gauge configuration and the subsequent algorithms used in the calculation of power output and the potential influence of bilateral imbalances within the muscles may have on these calculations

Everything You Always Wanted to Know about Sexes

What defines a sex? Although we tend to think there are only two - males and females - there are many different ways to mix and match the attributes of sexe

Wind tunnel experiments in fractal induced turbulence

Imperial Users onl

Upper Ordovician to Silurian facies patterns in eastern Ellesmere Island and western North Greenland and their bearing on the Nares Strait lineament

The upper Ordovician and lower Silurian sediments in the northern Nares Strait region formed during a series of platform margin collapses and platform subsidences. Facies changes from platform carbonates to slope and trough elastics are intricate, but two almost vertical facies fronts can be correlated across Nares Strait. The northernmost facies front is the carbonate platform margin (associated with a horst) which apparently formed at the fault-bounded edge of the stable craton. At this margin there is a facies boundary (interdigitation) between platform carbonates and elastics of the trough and this feature had a stationary location during the upper Ordovician and lower Silurian. On Ellesmere Island it is traceable from Cañon Fiord to Judge Daly Promontory; on Greenland, directly along strike, available data indicate that the linear coastline of northern Hall Land, and probably Nyeboe Land, coincides with the platform margin. There appears to have been little or no post-depositional offset of this margin along Nares Strait. Mudstones progressively migrated southward in Ellesmere Island during the upper Ordovician and the same facies reached Washington Land and Hall Land, Greenland, in the middle Llandovery (lower Silurian). The line of interdigitation (facies front) between carbonate and mudstone facies was a static, near vertical, feature from the middle Llandovery to upper Silurian in Washington Land and into the lower Devonian in Ellesmere Island. This facies boundary has a slightly curved form when projected across Nares Strait; a shape which is entirely consistent with the meandering nature of facies boundaries. The present distribution and relationship of upper Ordovician to lower Silurian sediments indicate that they were part of a single laterally continuous sedimentary regime. Both vertical facies fronts arc entirely consistent with no post-depositional movement along Nares Strait; however, they cannot rule out left-lateral displacement of as much as 25 km. Displacements greater than this introduce far more geological problems than they solve

Human Rights & the International Criminal Court

From the EPIIC Symposium at Tufts University. These articles speak about topics on war and the effects that the US government had on it, issues about war crimes, and human rights to name a few

Mapping it Out: Developing a Library Internship Program

Background Newly graduated librarians often do not possess the knowledge and skills essential to practicing in a health sciences library. This mismatch in experience and expectations stems from a lack of exposure to health sciences librarianship and the typically general nature of graduate education in library and information science. This gap in skills and understanding stems from a lack of opportunities to develop in these areas. At the same time, many experienced health sciences librarians do not have the supervisory roles as a regular part of their work, resulting in fewer opportunities to build managerial skills and experience. In 2019 a health sciences library at an urban academic health sciences institution decided to develop an internship program to address both of these issues. Description This presentation will address the development of the internship program, including collaboration between the department head and librarians to develop the program. It will also address how the COVID-19 pandemic affected the program and continued evolution of the program. The presentation will also highlight lessons learned, challenges, and the next steps to ensure the program\u27s sustainability. Conclusions After hosting two interns over a three-year period, the internship program continues to evolve. This talk will focus on future areas for assessment and lessons learned including efforts made to balance program goals while also providing the intern with broad exposure to different aspects of health sciences librarianship while also addressing the intern\u27s personal development goals. Perspectives from librarian managers will also be discussed

Successes and Challenges of Being Interim Leaders During a Pandemic

Background Assuming an interim leadership role presents personal opportunities for professional growth and organizational challenges. These challenges may stem from the temporary nature of the position and a lack of clear direction or decision-making authority. External forces, in this case the COVID-19 pandemic, also contribute to interim leaders\u27 challenges. Library administration at a large public research university with multiple interim positions worked to identify potential challenges and possible solutions for those designated to interim leadership roles. Description This session will describe a plan created to facilitate the transition into and out of interim positions, set expectations for these roles, and ensure clear communication across interim positions at all levels of the organization. The session will be from the perspective of two librarians designated to co-lead a department over a period of 13 months. The department consisted of six librarians with liaison responsibilities, a staff member, a library intern (hourly staff), and a student worker . Emphasis will be placed on describing the challenges of supervising and motivating the department during a time of transition and uncertainty. There will also be a discussion on how continuing responsibilities were prioritized/balanced with interim leadership responsibilities. This was a critical consideration when creating the reporting and responsibility structure. Conclusions The plan related to interim leadership was a success and provided both interim department heads with an opportunity to grow professionally. As a result, both interim leaders transitioned smoothly back into their roles within the department while making a meaningful contribution to the department\u27s direction. During the period of interim leadership, there were two notable accomplishments. A five-year plan tool/program was created to mentor those in the department regarding their professional growth. In addition, a mission statement was created that gave the members of the department a clear idea of the purpose of the work of the department

Twitter discourse around competitive cycling and sports-related concussion

The purpose of this study was to explore the cycling community’s online interactions with sports-related concussion within competitive cycling. Through an analysis of twitter data (n=196), this study examined the discourse related to the problem of concussion in cycling. The results indicated that overall engagement and awareness of concussion in cycling was low but has been increasing year on year from 2008 to 2019. Thematic analysis of the data found three main themes within the online cycling community on Twitter: 1) Increasing awareness of concussion as a problem for the sport 2) A narrative of apathy in policy by governing bodies and 3) The need for better education as a result of misperceptions of concussion. Overall, these findings contribute to the limited research in the field of concussion in competitive cycling and outline the utility of social media as a platform to disseminate educational resources around the safe management of concussion in the sport