Producers and landowners in Illinois, we need your help tracking down sites to resample soils that were originally sampled as far back as 1899. Resampling would provide us with up to a 120+ year time series to provide insights to soil change. Map here:

@agronomistag @Soilecol118999 @HushtonBlock Great book on this:

How do methods for estimating soil P mineralization with radioisotopes stack up? How can they be improved? Newly published "In pursuit of soil P mineralization: A review and synthesis of radioisotopic labeling techniques" (SBB) provides a quant synthesis:

Do soil enzyme activity assays need buffers? No. Building on previous work, we find buffers (i) *suppress* activity of phosphatase and (ii) alter apparent kinetic properties relative to water. With @wills_skye & @jordon_wade @USDA_NRCS @soil_institute

@BobGunzy @visionaryagron1 However: what percentile one uses doesn't matter IF the distribution is tight. Wide distributions aggravate the use of a single value. E.g. corn K is pretty tight, but wheat P is broad. From

@BobGunzy @visionaryagron1 Illinois is the same - we use 75th percentile values, which by definition means we are higher than 75% of fields and lower on 25% of fields. As Howard said, any handbook value will by definition be inaccurate (unless you're that lucky field that falls right on the percentile!)

@LindsayCMalone @badgerbean @WISoyCheckoff @arkansassoybean @ncsoybeans @MichiganSoybean @NCStatesoybeans @arksoydoc @RuarkLab @jordon_wade "Permanganate reduction" is the most literal and accurate term we have at the moment:

RT @tomasdc13: Strategies to quantify and reduce N2O emissions from crops focus on N fertilizer management. Here we show that ~40% of N2O e…

@fielddirt Wish we had long-term (>100 year) trials across the landscape! We should start now...

@morgsbrew @agronomistag What are the soil test P levels like from all that compost?

RT @drippner: Come push the boundaries of what is possible in soil science by developing workflows to train and segment 2/3D image data col…

@TuomasJMattila @jordon_wade Here we found that not fertilizing with P while still cropping over 36 years removed a cumulative total of 426 to 945 kg P/ha. Soil tests did not show inadequate P during this time. Lots of residual P from manure that was mined over one-third century

@drippner and I are looking to hire a postdoc to lead X-ray CT of soils under 149 year treatments from @UofIllinois historic Morrow Plots. Machine learning image analysis to quantify and link soil pore networks with biogeochemical functions. Remote work possible. @EMSLscience

Position opening: Research Scientist in Biogeochemistry in the Institute for Sustainability, Energy, and Environment (ISEE) at @UofIllinois @sustainILLINOIS We are looking for a Research Scientist to lead multiple projects on soil-water P. Apps due Oct 18

@sjindo928 (NW, SW, Sec.4, T15S, R3W, Alexander County, Illinois)

@MoreorLoess Alfisol: fine-silty, mixed, superactive, mesic Typic Hapludalf