THE EFFECT OF FEEDGRAIN PROGRAM PARTICIPATION ON CHEMICAL USE

Economic incentives created by the commodity programs are hypothesized to cause program participants to apply agrichemicals at greater rates than nonparticipants. Corn producers who participate in the USDA feedgrain program are shown to apply nitrogen, herbicides, and insecticides at statistically greater rates than those who do not participate.Crop Production/Industries,

K/T boundary stratigraphy: Evidence for multiple impacts and a possible comet stream

A critical set of observations bearing on the K/T boundary events were obtained from several dozen sites in western North America. Thin strata at and adjacent to the K/T boundary are locally preserved in association with coal beds at these sites. The strata were laid down in local shallow basins that were either intermittently flooded or occupied by very shallow ponds. Detailed examination of the stratigraphy at numerous sites led to the recognition of two distinct strata at the boundary. From the time that the two strata were first recognized, E.M. Shoemaker has maintained that they record two impact events. We report some of the evidence that supports this conclusion

Complexity\u27s Shadow: American Indian Property, Sovereignty, and the Future

This Article offers a new perspective on the challenges of the modern American Indian land tenure system. While some property theorists have renewed focus on isolated aspects of Indian land tenure, including the historic inequities of colonial takings of Indian lands, this Article argues that the complexity of today’s federally imposed reservation property system does much of the same colonizing work that historic Indian land policies—from allotment to removal to termination—did overtly. But now, these inequities are largely overshadowed by the daunting complexity of the whole land tenure structure. This Article introduces a new taxonomy of complexity in American Indian land tenure and explores in particular how the recent trend of hypercategorizing property and sovereignty interests into ever-more granular and interacting jurisdictional variables has exacerbated development and self-governance challenges in Indian country. This structural complexity serves no adequate purpose for Indian landowners or Indian nations and, instead, creates perverse incentives to grow the federal oversight role. Complexity begets complexity, and this has created a self-perpetuating and inefficient cycle of federal control. Stepping back and reviewing Indian land tenure in its entirety—as a whole complex, dynamic, and ultimately adaptable system—allows the introduction of new, and potentially fruitful, management techniques borrowed from social and ecological sciences. Top-down Indian land reforms have consistently intensified complexity’s costs. This Article explores how emphasizing grassroots experimentation and local flexibility instead can create critical space for more radical, reservation-by-reservation transformations of local property systems into the future

Re-Placing Property

This Article analyzes the complex relationship between property and placemaking. Our most basic property and land tenure choices—including the design of the fee simple itself—shape people-place relations in powerful ways. By unearthing this important relationship between property and placemaking, this Article also reveals how pervasive—but unorganized—claims about place and place attachment already are across a range of modern land conflicts. Because property theory has not been fully transparent about many of these placemaking effects, our property choices often result in outcomes that are unequal, inconsistent, and opaque, prioritizing some existing place relations while ignoring or rejecting others. By building a more comprehensive placemaking account—with examples from Indigenous pipeline protestors to the absent and now-urban heirs of family farms and the emergence of new build-to-rent suburban housing divisions—this Article introduces a new taxonomy for evaluating the relative protection we afford to various place and place-attachment claims. This new framework separates the individual, collective, and ecological benefits of positive place relations from the risks of either overprotected place attachments (as in the case of hereditary land dynasties and exclusionary wealth) or land ownership without any attachment at all (as in the transformation of land and housing into asset classes for commodification and financialized capture). This clearer focus on placemaking also puts property law—and land tenure— at the center of core social, economic, and climate challenges, including growing institutional and foreign investment in U.S. farmland (as rural landscapes depopulate and agriculture becomes even more industrialized) and private equity’s increasing appetite for single-family housing (as the United States’ glaring wealth gap continues to expand). It also forces us to confront property’s ongoing role in the dispossession of groups, cultures, and communities that are not (or are no longer) recognized as legal owners and our repeated failure to accommodate the access needs of individuals not born into hereditary land or wealth. Weaving together both rural and urban case studies, this Article ultimately offers novel entry points to some of property’s perennial problems, including pervasive distributional inequities, while providing new language and a fresh lens for reimagining more just and sustainable property relations for our rapidly changing world. In a final series of property-based personal stories, the article centers new forms of access rights—including some public rights over private properties—as instrumental to reconnecting and collectively reimagining the kinds of places we want to make together

Chemical fractionation of siderophile elements in impactites from Australian meteorite craters

The abundance pattern of siderophile elements in terrestrial and lunar impact melt rocks was used extensively to infer the nature of the impacting projectiles. An implicit assumption made is that the siderophile abundance ratios of the projectiles are approximately preserved during mixing of the projectile constituents with the impact melts. As this mixture occurs during flow of strongly shocked materials at high temperatures, however there are grounds for suspecting that the underlying assumption is not always valid. In particular, fractionation of the melted and partly vaporized material of the projectile might be expected because of differences in volatility, solubility in silicate melts, and other characteristics of the constituent elements. Impactites from craters with associated meteorites offer special opportunities to test the assumptions on which projectile identifications are based and to study chemical fractionation that occurred during the impact process