NO-TILLAGE RENOVATION OF ALFALFA STANDS

The effects of herbicides, timing, and rates on the introduction of alfalfa (Medicago sativa L.) into six stands of alfalfa at varying stages of decline were investigated. Alfalfa was seeded on several dates from 25 April through 28 May 1979 with a Tye Pasture Pleaser(\u27R) no-till seeder. G

Sod seeding of forages, Station Bulletin, no.526

The Bulletin is a publication of the New Hampshire Agricultural Experiment Station, College of Life Sciences and Agriculture, University of New Hampshire, Durham, New Hampshire

Impact of land use patterns and agricultural practices on water quality in the Calapooia River Basin of western Oregon

Agricultural practices, including tillage, fertilization, and residue management, can affect surface runoff, soil erosion, and nutrient cycling. These processes, in turn, may adversely affect (1) quality of aquatic resources as habitat for amphibians, fish, and invertebrates, (2) costs of treating surface and ground water to meet drinking water standards, and (3) large-scale biogeochemistry. This study characterized the surface water sources of nitrogen (N) (total, nitrate [NO₃⁻], ammonium [NH₄⁺], and dissolved organic N) and sediment active within 40 subbasins of the Calapooia River Basin in western Oregon in monthly samples over three cropping years. The subbasins included both independent and nested drainages, with wide ranges in tree cover, agricultural practices, slopes, and soils. Sediment and N form concentrations were tested against weather and agricultural practice variables. Subbasin land use ranged from 96% forest to 100% agriculture. Average slopes varied from 1.3% to 18.9%, and surface water quality ranged from 0.5 to 43 mg L⁻¹ (ppm) total N maxima and 29 to 249 mg L⁻¹ suspended sediment maxima. Total N during the winter was positively related to percentage landcover of seven common agricultural crops (nongrass seed summer annuals, established seed crops of perennial ryegrass [Lolium perenne L.], tall fescue [Schedonorus phoenix {Scop.} Holub], orchardgrass [Dactylis glomerata L.], clover [Trifolium spp.], and newly planted stands of perennial ryegrass and clover) and negatively related to cover by trees and one seed crop, Italian (annual) ryegrass (Lolium multiflorum). Results for NO₃⁻ and total N were highly similar. Sediment concentrations were most strongly related to rainfall totals during periods of 4 and 14 days prior to sampling, with smaller effects of soil disturbance. Fourier analysis of total N over time identified four prominent groups of subbasins: those with (1) low, (2) medium, and (3) high impacts of N (up to 2, 8, and 21 mg L⁻¹, respectively) and a strong cyclical signal peaking in December and (4) those with very high impact of N (up to 43 mg L⁻¹) and a weak time series signal. Preponderance of N in streams draining agriculturally dominated subbasins was in the form of the NO₃⁻ ion, implying mineralization of N that had been incorporated within plant tissue following its initial application in the spring as urea-based fertilizer. Since mineralization is driven by seasonal rainfall and temperature patterns, changes in agronomic practices designed to reduce prompt runoff of fertilizer are unlikely to achieve to more than similar to ~24% reduction in N export to streams.This is the publisher’s final pdf. The published article is copyrighted by Soil and Water Conservation Society and can be found at: http://www.jswconline.org/Keywords: Ecosystem services, Geographically weighted regression, Water quality, Fourier time series analysi

HOSPICIJ-POTREBA HUMANOG DRUŠTVA

Hrvatsko zakonodavstvo i regulativa palijativne skrbi imaju postavljene neke smjernice za razvoj u Republici Hrvatskoj. Međutim, da uhvatimo korak s razvijenim zemljama treba puno toga pravno i organizacijski urediti. Imamo znanje, imamo volju , imamo svijest nesebičnog djelovanja, ali nemamo financijske mogućnosti u ovom trenutku.O palijativnoj skrbi svaki pojedinac počinje razmišljati tek onda kada mu se razboli član njegove obitelji. Da smo u stanju podići ovu djelatnost u prioritete, našla bi se i sredstva za nju. Da bismo mogli iskoristiti znanje koje imamo treba odmah djelovati. To neće biti jednostavan proces, no u svijetu postoji puno modela i primjera, pa bi se uz iskustvo drugih, naš stručni kadar, te djelovanje na fleksibilnost hrvatske birokracije, okolnosti mogle promijeniti u pozitivnom smislu. Ne zbog nas, ali možda i za nas

Landsat7 gap repaired imagery

Landsat 7 imagery with SLC gaps repaired using multistep block mapping on principal component uniformity. Scenes repaired include path/row 46/29, 46/28, 27/29, 118/41, and 35/39 for various image acquisition dates. Python code performing the repair is also included

2019 version of western Oregon agricultural landuse 2004-2017

Agricultural landuse classification for Willamette Valley, Oregon, from 2004 through 2017 superceeds previous 2004 through 2014 classification