Sjoerd W. Duiker
A5082441356- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Soil and Unsaturated Flow
- Agronomic Practices and Intercropping Systems
- Crop Yield and Soil Fertility
- Soil erosion and sediment transport
- Soil Management and Crop Yield
- Rangeland and Wildlife Management
- Weed Control and Herbicide Applications
- Bioenergy crop production and management
- Legume Nitrogen Fixing Symbiosis
- Plant Water Relations and Carbon Dynamics
- Microbial Community Ecology and Physiology
- Clay minerals and soil interactions
- Agricultural Innovations and Practices
- Fungal Biology and Applications
- Hydrology and Watershed Management Studies
- Forest Management and Policy
- Remote Sensing in Agriculture
- Mycorrhizal Fungi and Plant Interactions
- Iron oxide chemistry and applications
- Growth and nutrition in plants
- Agricultural Economics and Policy
- Land Use and Ecosystem Services
- Composting and Vermicomposting Techniques
Pennsylvania State University
2014-2024
Planta
2011-2017
United States Geological Survey
2015
United States Department of Agriculture
2015
Agricultural Research Service
2015
University of Maryland, College Park
2015
The Ohio State University
1999-2000
Soil organic carbon (SOC) is closely tied to soil health. However, additional biological indicators may also provide insight about C dynamics and microbial activity. We used SOC the other (potential mineralization, permanganate oxidizable C, water extractable β-glucosidase enzyme activity) from North American Project Evaluate Health Measurements examine continental-scale drivers of these indicators, relationships among effects health practices on indicator values. All had greater values at...
Differences in crystallinity may explain why total Fe (hydr)oxide content has a variable effect on aggregate stability. Therefore, surface soil samples with range of poorly crystalline contents were characterized for water‐stable aggregates >0.25 mm (WSA), mean‐weighted diameter (MWD), organic C (OC), particle‐size distribution, pH, exchangeable cations, citrate/bicarbonate/dithionite (subscript d), and acid ammonium oxalate o) extractable Fe, Al, Si. The WSA MWD from 23 to 95%, 0.3 5.1...
Rolling‐crimping to control hairy vetch ( Vicia villosa Roth) may make organic no‐till corn Zea mays L.) possible. This study investigated how rolling‐crimping date and growth stage of the cover crop affected if a rolled‐crimped could supply weed for corn. Hairy was planted in late August rolled crimped at four dates (“planting dates”) between May June three Pennsylvania locations. biomass, measured each planting date, varied from 2000 8000 kg ha −1 with roller‐crimper through flowering...
Northeastern U.S. (New York, Pennsylvania, and New England states) dairy farmers are increasingly interested in improving soil health, nutrient sequestration, dry matter production. Consequently, ask about managing winter cover crops (WCCs) corn silage ( Zea mays L.) rotations. In this literature review we identify WCCs most suitable to the Northeast, summarize studies on (i) fall spring N accumulation, (ii) nitrogen fertilizer replacement value (NFRV) for next crop, (3) environmental...
Aggregate stability is a commonly used indicator of soil health because improvements in aggregate are related to reduced erodibility and improved soil–water dynamics. During the past 80 90 years, numerous methods have been developed assess stability. Limited comparisons among resulted varied magnitudes response management practices influences inherent properties climate. It not clear whether selection specific method creates any advantage investigator. This study assessed four measuring...
Abstract Currently accepted pedotransfer functions show negligible effect of management‐induced changes to soil organic carbon (SOC) on plant available water holding capacity (θ AWHC ), while some studies the ability substantially increase θ through management. The Soil Health Institute's North America Project Evaluate Measurements measured content at field using intact cores across 124 long‐term research sites that contained increases in SOC as a result management treatments such reduced...
No‐till farmers who want more from their cover crops (CCs) are delaying CC termination until the main crop is planted. Delaying can help dry wet soils and reduce erosion. This process referred to as planting green (PG). We hypothesized that PG would (i) soil at planting, but conserve moisture later in growing season; (ii) temperature; (iii) slug damage on crops; (iv) not yield. experiment was conducted Pennsylvania between 2015 2017 compare two dates: preplant killed (PK) (PG) corn ( Zea...
Abstract Farmers, scientists, and other soil health stakeholders require interpretable indicators of hydraulic function. Determining which to use has been difficult because measurement disconformity, spatial temporal variability, recently established treatments, the effect site characteristics on management practice differences. The North American Project Evaluate Soil Health Measurements includes 124 sites uniformly sampled across a range practices in America 2019. We compare recommend...
Potential carbon mineralization (Cmin) is a commonly used indicator of soil health, with greater Cmin values interpreted as healthier soil. While are typically in agricultural soils managed minimal physical disturbance, the mechanisms driving increases remain poorly understood. This study assessed bacterial and archaeal community structure potential microbial drivers maintained under various degrees disturbance. mineralization, 16S rRNA sequences, characterization data were collected part...
Abstract Various soil health indicators that measure a chemically defined fraction of nitrogen (N) or process related to N cycling have been proposed quantify the potential supply crops, key function. We evaluated five (total N, autoclavable citrate extractable water‐extractable organic potentially mineralizable and ‐acetyl‐β‐ D ‐glucosaminidase activity) at 124 sites with long‐term experiments across North America evaluating variety managements. found 59%–81% variation in was among sites,...
A late‐killed rye ( Secale cereale L.) cover crop has many environmental benefits. However, can reduce following corn Zea mays yield and compromise pre‐emergence herbicide activity. Our hypotheses were (i) reduces yields, especially if killed at late‐boot stage; (ii) in‐row tillage helps alleviate reductions; (iii) postemergence weed control will be more effective than in the presence of mulch. Corn was planted 7 to 10 d after early‐ stage with no‐till or zone‐till. no‐rye included for...
Cover crop management with a roller/crimper might reduce the need for herbicide. Weed suppression from rolled cereal rye cover was compared to no and without postemergence herbicide application in no-till soybean. The experiment designed as two-way factorial termination soybean planting date first factor weed control treatment second. Cereal drill-seeded late September managed using glyphosate followed by spring. Soybean seeded after rolling applied about 6 wk half plots. Rye biomass doubled...
In the Chesapeake Bay Watershed, winter cereal cover crops are often planted in rotation with summer to reduce loss of nutrients and sediment from agricultural systems. Cover can also improve soil health, control weeds pests, supplement forage needs, support resilient cropping southeastern Pennsylvania, be successfully established following corn (<i>Zea mays</i> L.) silage harvest strongly promoted for use this niche. They grain, soybean (<i>Glycine max</i> L.), vegetable harvest....
Soil compaction effects on maize ( Zea mays L.) plant population, height, and yield were studied from 2002–2005 in a no‐tillage/in‐row tillage study Hublersburg silt loam soil (Typic Hapludult) Pennsylvania. was compacted annually with three‐axle truck 10‐Mg axle load mounted road tires (700 kPa inflation pressure) or flotation (250 kPa). In another treatment, only the first year without subsequent compaction. Remediation treatments deep (40 cm) in‐row before after shallow (10 cm 2002–2003...
In temperate climates, performance of fall‐established cover crops is affected by establishment and termination date. This study evaluated the effect mid‐September to mid‐October dates on crop biomass production from early May June in Landisville (USDA Plant Hardiness Zone 6b) Rock Springs (Zone 6a). Rye ( Cereale secale L.), wheat Triticum aestivum barley Hordeum vulgare annual ryegrass Lolium multiflorum Lam.), hairy vetch Vicia villosa Roth.), crimson clover Trifolium incarnatum rape...
Most General Circulation Models predict more infrequent but larger precipitation events in the eastern United States combined with a warmer climate. This could have negative effect on maize production. To understand sensitivity of production to future changes precipitation, we analyzed growing season and average state yields for period 1963–2011. Growing did not show strong trend during this period. However, crop increased at 3.90% southern, 2.62% central, 2.31% northern part States, which...
Plant-based sensors can potentially be an answer to mitigate the shortcomings of common plant water status monitoring methods. In this study, leaf thickness and electrical capacitance (CAP) were investigated as indicators stress. The experiment was conducted on a tomato () in growth chamber with constant temperature 28°C 12 h on/off photoperiod for 11 days. medium used peat potting mixture, its volumetric content (θ) measured by soil moisture sensor. maintained at field capacity first three...