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Transactions of the ASAE
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2004
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2004 v.47 no.3
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1. Airborne hyperspectral imagery and yield monitor data for estimating grain sorghum yield variability
- Author:
- Yang, C.; Everitt, J.H.; Bradford, J.M.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 915
- ISSN:
- 0001-2351
- Subject:
- Sorghum bicolor; grain crops; grain sorghum; grain yield; yield mapping; spatial variation; multispectral imagery; remote sensing; principal component analysis; Texas
- Abstract:
- ... As hyperspectral imagery is becoming more available, it is necessary to evaluate its potential for crop monitoring and precision agriculture applications. In this study, airborne hyperspectral imagery was examined for estimating grain sorghum (Sorghum bicolor (L.) Moench) yield variability as compared with yield monitor data. Hyperspectral images containing 128 spectral bands in the visible to nea ...
- Handle:
- 10113/9680
- Author:
- Saleh, A.; Williams, J.R.; Wood, J.C.; Hauck, L.M.; Blackburn, W.H.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 751
- ISSN:
- 0001-2351
- Subject:
- forested watersheds; silvicultural practices; site preparation; losses from soil; nitrate nitrogen; organic nitrogen compounds; phosphates; organophosphorus compounds; phosphorus; sediment yield; runoff; forest roads; water erosion; simulation models; mathematical models; erosion control; filter strips; pollution control; best management practices; water pollution; nonpoint source pollution; environmental models; forest litter; computer analysis; Texas
- Abstract:
- ... This study was conducted to determine if the Agricultural Policy/Environmental Extender (APEX) model could reasonably replicate the effects of silvicultural practices on streamflow and loading of sediments and nutrients. APEX was modified to enhance factors associated with forestry conditions such as rainfall interception by canopy, litter, subsurface flow, nutrient movement, and routing enrichmen ...
- Handle:
- 10113/9677
- Author:
- Brazee, R.D.; Bukovac, M.J.; Zhu, H.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 629
- ISSN:
- 0001-2351
- Subject:
- crops; plant cuticle; leaves; fruits (plant anatomy); naphthaleneacetic acid; spraying; foliar spraying; ammonium nitrate; additives; foliar uptake; diffusion; diffusivity; mathematical models; simulation models
- Abstract:
- ... Current agricultural crop management practices stand in need of more effective ways to enhance penetration by spray-applied systemic materials through rate-limiting, plant cuticular surfaces. A goal of this study was to develop a plant cuticular penetration model that may aid in identifying and quantifying factors in transcuticular transport that can be effectively managed to promote penetration. ...
- Handle:
- 10113/9675
- Author:
- Amatya, D.M.; Chescheir, G.M.; Fernandez, G.P.; Skaggs, R.W.; Gilliam, J.W.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 677-687
- ISSN:
- 0001-2351
- Subject:
- water pollution; simulation models; nitrogen; forested watersheds; streams; losses from soil; watershed hydrology; poorly drained soils; forest soils; hydrologic models; hydrochemistry; soil water movement; North Carolina
- Abstract:
- ... Methods are needed to quantify effects of land use and management practices on nutrient and sediment loads at the watershed scale. Two methods were used to apply a DRAINMOD-based watershed-scale model (DRAINWAT) to estimate total nitrogen (N) transport from a poorly drained, forested watershed. In both methods, in-stream retention or losses of N were calculated with a lumped-parameter model, which ...
- Author:
- Butts, C.L.; Davidson, J.I. Jr.; Lamb, M.C.; Kandala, C.V.; Troeger, J.M.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 925
- ISSN:
- 0001-2351
- Subject:
- water content; peanuts; air drying; curing (crops); duration; expert systems; decision support systems; equations; mathematical models; simulation models; pods; computer analysis
- Abstract:
- ... A decision support system to manage commercial peanut drying facilities was developed. Empirical equations to predict peanut drying time were developed using PNUTDRY, a bulk peanut curing model. Input data for the empirical model includes daily maximum/minimum ambient temperature, maximum allowable plenum temperature, maximum allowable temperature rise, initial and final pod moisture content, and ...
- Handle:
- 10113/9681
- Author:
- Wauchope, R.D.; Truman, C.C.; Johnson, A.W.; Sumner, H.R.; Hook, J.E.; Dowler, C.C.; Chandler, L.D.; Gascho, G.J.; Davis, J.G.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 669
- ISSN:
- 0001-2351
- Subject:
- fenamiphos; pesticide residues; metabolites; losses from soil; agricultural runoff; rain; agricultural soils; sandy soils; field experimentation; experimental design; soil pollution; water pollution; loamy sand soils; Georgia
- Abstract:
- ... The purpose of this study was to compare two commonly used runoff experimental methods, which have different scales, on measurements of runoff and associated fenamiphos and metabolite losses over a 2-year period. Methods used were 15 m wide by 43 m long (645 m2) mesoplots and 1.8 m wide by 3 m long (5.4 m2) microplots, under simulated rainfall (25 mm h-1 for 2 h) at 1, 14, and 28 d after fenamipho ...
- Handle:
- 10113/9676
- Author:
- Dabney, S.M.; Wilson, G.V.; McGregor, K.C.; Foster, G.R.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 767
- ISSN:
- 0001-2351
- Subject:
- loess soils; water erosion; no-tillage; chiseling; discing; silt loam soils; crop production; Zea mays; corn; crop residue management; crop residues; long term experiments; runoff; sediment yield; fallow; erodibility; soil physical properties; Mississippi
- Abstract:
- ... Studies have shown that no-till (NT) management reduces soil erosion relative to chisel/disk-tillage (CT) and that this benefit may increase over time. There are fewer data, however, to separate the erosion-reduction contributions of surface residue mulch from those of improved soil properties under NT. The objective of this study was to quantify these separate contributions for a silt loam soil ( ...
- Handle:
- 10113/9678
- Author:
- Bennedsen, B.S.; Peterson, D.L.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 889
- ISSN:
- 0001-2351
- Subject:
- apples; image analysis; infrared radiation; light; stems; calyx; product defects; fruit quality; sorting; product grading; neural networks
- Abstract:
- ... Neural networks and unsupervised feature extraction were used to classify apple images based on whether or not they included a stem or calyx end. In one experiment, the system successfully classified 98.4% of a test set consisting of 254 near-infrared images captured at 740 nm. The network was also tested on gray-level images captured with light in the visible range. In this test of 242 images, 5% ...
- Handle:
- 10113/9679
- Author:
- Rhee, H.; Fridley, J.L.; Foltz, R.B.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 961
- ISSN:
- 0001-2351
- Subject:
- forest roads; water erosion; sediment yield; Water Erosion Prediction Project; topography; hills; slope; streams; simulation models; Idaho
- Abstract:
- ... This study investigates the modeling question: "What level of geometric detail is necessary for modeling surface erosion from a forest road network?" We used the Water Erosion Prediction Project (WEPP) model to predict road sediment yield from a road network in a timber sale on the Boise National Forest, Idaho. Using three levels of detail (high, intermediate, and low), the outsloped 4.4 km road w ...
- Handle:
- 10113/9682
- Author:
- Hummel, J.W.; Ahmad, I.S.; Newman, S.C.; Sudduth, K.A.; Drummond, S.T.
- Source:
- Transactions of the ASAE 2004 v.47 no.3 pp. 607
- ISSN:
- 0001-2351
- Subject:
- soil water; soil water content; soil compaction; sensors; penetrometers; soil penetration resistance; infrared radiation; reflectance; bulk density; clay fraction; clay loam soils; sandy loam soils; silt loam soils
- Abstract:
- ... Soil compaction can restrict root growth and water infiltration, resulting in yield reduction. Maps of yield monitor data aid in visualization of variations in yield, without identifying underlying factors for these variations. Soil penetration resistance can help identify areas where soil physical characteristics are negatively impacting yield. However, penetration resistance is a function of soi ...
- Handle:
- 10113/9674