Reflective bands of Landsat-5 Thematic Mapper satellite imagery were used to facilitate the estimation of basal crop evapotranspiration (ETcb), or potential crop water use, in San Joaquin Valley fields during 2008. A ground-based digital camera measured green fractional cover (Fc) of 49 commercial fields planted to 18 different crop types (row crops, grains, orchard, vineyard) of varying maturi...

Proper N fertilizer and irrigation management can reduce nitrate leaching while maintaining crop yield, which is critical to enhance the sustainability of vegetable production on soils with poor water and nutrient-holding capacities. This study evaluated different methods to measure nitrate leaching in mulched drip-irrigated zucchini, pepper, and tomato production systems. Fertigation rates wer...

There are few consistent and comprehensive data sets for the calibration and veri®cation of computer models of pesticide fate in agro-ecosystems. To partly close this gap the data base of the multidisciplinary Weiherbach research project was used to form a data set that is well suited for that purpose. It has been successfully used during the COST Action 66 model comparison. The Weiherbach rese...

In cold regions, climate change is expected to result in warmer winter temperatures and increased temperature variability. Coupled with changing precipitation regimes, these changes can decrease soil insulation by reducing snow cover, exposing soils colder more frequent extensive freezing thawing. Freeze-thaw events exert an important control over processes the cycling of nitrogen (N), conseque...

An application of the recently proposed generalized relevance learning vector quantization (GRLVQ) to the analysis and modeling of time series data is presented. We use GRLVQ for two tasks: first, for obtaining a phase space embedding of a scalar time series, and second, for short term and long term data prediction. The proposed embedding method is tested with a signal from the wellknown Lorenz...

Zones of Weakness in the Earth's Crust: DR. WiLL Quotations: LIAM BowiE ........ 589 Biochemistry and Medicine................. .... 610 Periodicals for Mathematicians: PROFESSOR EDWARD Scientific Apparatus and Laboratory Methods: S. ALLEN .. 592 An Issue Raised in "A New Type of Lysimeter The American Association for the Advancement of at the New Jersey Agricultural Experimnent StaScience: tio...

Three macroscopic root water uptake models (Molz–Remson, Feddes, and Selim–Iskandar) have been widely used in modeling water flow in soil–plant systems. In this article, we use evapotranspiration data and soil water content data obtained from lysimeter measurements and root distribution data obtained in a nearby wheat field to evaluate the accuracy of these root water uptake models in predictin...

The paper describes one of the four datasets used to test pesticide leaching models within the Working Group Modelling of the EC European Program COST Action 66 `Fate of Pesticides in the Soil and the Environment'. The Tor Mancina dataset is the result of a 3-year lysimeter experiment carried out near Rome (Italy) on a clay-loam calcareous ̄uvisol, which aimed to asses the risk of groundwater c...

Turfgrass Research. The lysimeter is 4.0 m deep, 2.5 m in diameter, and contains a homogeneous packing of Vinton fine Experiments were conducted in a well-instrumented weighing lysand (sandy, mixed, thermic Typic Torrifluvents) with a mean simeter (2.5 by 4 m) to evaluate the efficacy of the gas-phase-partibulk density of 1.38 Mg m 3 and porosity of 0.47. Details tioning tracer method for measu...