Soils climate

One of the first complete, continuous simulation models was the pesticide mnoff transport model (PRT) (56). Improvements in the PRT modelled to the hydrologic simulation program—FORTRAN model (57). A number of other models have been developed (58,59). These models represent a compromise between the avadable data and the abiHty to encompass a wide range in soils, climates, and pesticides. These models have had mixed success when extended beyond the data with which they were caHbrated. No model has yet been developed that can be proven to give accurate predictions of... 

Soil is distinguished by the complex nature of its composition and of its interaction with other environmental factors. No two soils are exactly alike, and extremes of structure, composition and corrosive activity are found in different soils. Climatic factors of rainfall, temperature, air movement and sunlight can cause marked alterations in soil properties which relate directly to the rates at which corrosion will take place on metals buried in these soils. 

Soil, climatic, and hydrogeological conditions vary widely between geographical regions. This variation occurs on a variety of scales and significantly affects agrochemical dissipation rates and fates in the environment. As a result, differences in... 

Natural resources affect people and people affect natural resources. Many qualities or attributes of nature are customarily described as "natural resources" - soils, climate, plants, minerals, and others. But these are not really resources for human welfare until appropriate amounts of human energy, resourcefulness, capital, and managerial capacity have been applied to these qualities of nature, to transform them into materials and services usable by people. 

EPIC is designed to simulate relevant biophysical processes simultaneously and realistically, using readily available input data and accepted methods. It is capable of simulating plant and soil response for hundreds of years, and it is applicable to a wide range of soils, climates, and plants. EPIC also simulates soil erosion and soil chemical and physical property changes over centuries. The time limit for simulation of hydrologic parameters is restricted only by the availability of high-quality climate input data. 

These values are significantly different from those that have been earlier calculated by RAIN-ASIA model (World Bank, 1994). These differences might be related to the much more detailed and comprehensive national data sets on geological, soil, climate (precipitation, temperature, evapotranspiration, runoff, etc.) and vegetation mapping, physico-chemical properties of soils and geological rocks. This allows the authors to calculate more precise values of all constituents used for maximum sulfur critical load calculation and mapping. 

Mosier AR, Duxbury JM, Freney JR, Heinemeyer O, Minami K. 1998a. Assessing and mitigating N2O emissions from agricultural soils. Climatic Change 40 7-38. 

Composition. Molasses composition depends on several factors, eg, locality, variety, soil, climate, and processing. Cane molasses is generally at pH 5.5 —6.5 and contains 30—40 wt % sucrose and 15—20 wt % reducing sugars. Beet molasses is ca 7.5—8.6 pH, and contains ca 50—60 wt % sucrose, a trace of reducing sugars, and 0.5—2.0 wt % raffinose. Cane molasses contains less ash, less nitrogenous material, but considerably more vitamins than beet molasses. Composition of selected molasses products is listed in Table 7. Procedures for molasses analysis are available (59). 

Integrated crop management A whole-farm strategy that involves managing crops in ways that suit local soil, climatic, and economic conditions. 

Numerous herbicides are available for the diversity of soils, climates, and environmental conditions, based on research by the South Africa Sugar Association Experiment Station. Major herbicides include ametryn, alachlor, atrazine, hexazinone, and metribuzin. 

Frolking and Grill (1994) developed a peat soil climate model driven by daily weather and used correlations of CH4 flux with environmental parameters to investigate how climate and weather control the observed temporal variability... 

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