Manage crop substrate.
Management should include
- evaluating substrate components, including peat moss, bark, coir, soil, vermiculite, perlite, sand, compost, wetting agents, and mycorrhiza
- assessing substrate moisture level and optimum levels
- handling substrate
- preparing a substrate sample for testing and evaluating
- testing substrate pH and electrical conductivity (EC).
- How do the components of a substrate influence plant growth?
- What is the importance of using sterilized substrate?
- How should substrates be stored?
- Why is it important to understand how various substrates differ in water-holding capacity?
- Which substrates use biological agents to maximize nutrient uptake?
Related Standards of Learning
The student will demonstrate an understanding of scientific reasoning, logic, and the nature of science by planning and conducting investigations in which
- observations of living organisms are recorded in the lab and in the field;
- hypotheses are formulated based on direct observations and information from scientific literature;
- variables are defined and investigations are designed to test hypotheses;
- graphing and arithmetic calculations are used as tools in data analysis;
- conclusions are formed based on recorded quantitative and qualitative data;
- sources of error inherent in experimental design are identified and discussed;
- validity of data is determined;
- chemicals and equipment are used in a safe manner;
- appropriate technology including computers, graphing calculators, and probeware is used for gathering and analyzing data, communicating results, modeling concepts, and simulating experimental conditions;
- research utilizes scientific literature;
- differentiation is made among a scientific hypothesis, theory, and law;
- alternative scientific explanations and models are recognized and analyzed; and
- current applications of biological concepts are used.