β Scribed by H. L. Penman
No coin nor oath required. For personal study only.
Weather problems in farming fall into three groups. Statistical problems include the forecasting of weather for strategical and tactical use in planning farming operations, and the forecasting of crop yields from weather data. Biological problems arise in studies of growth and of the spread of disease, and demand a wider knowledge of techniques suitable for use in microβmeteorology. Physical problems are largely transport problems in the building up of plant and animal environments.
A typical problem from the last group is the disposal of available solar energy, and it is shown that an energy balance sheet can be drawn up to leave evaporation as the only unknown under prescribed conditions that make the treatment directly applicable to control of irrigation operations. Such an application is described for an experiment on irrigation of sugar beet during the summer of 1948. Results were as' satisfactory as the weather of the growing season would permit, the application of a total of 2.6 in. of irrigation (based on weather data) giving a slightly better yield of sugar than a total of 4.7 in. applied whenever expert inspection of the crop decided that irrigation was necessary.
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The derivation of the field survey method underpinning River Habitat Survey (RHS) is presented. The paper covers the development of the method from output requirements through to delivery of the system. 2. Major requirements for the field survey were to provide a rapid, single-visit method to provi
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