Reducing the Use of Agrochemicals: A Simple Experiment

M. M. Vidal , Olga M. S. Filipe and M. C. Cruz Costa
Departamento de Ciências Exactas e do Ambiente—CERNAS, Escola Superior Agráriade Coimbra, Bencanta, 3040-316 Coimbra, Portugal
J. Chem. Educ., 2006, 83 (2), p 245
DOI: 10.1021/ed083p245
Publication Date (Web): February 1, 2006
History, Education, and Documentation

Abstract

This article describes a simple laboratory project to introduce students to nonpoint source pollution, which may interest undergraduate and graduate students of environmental or agricultural chemistry courses. Students become aware that dissemination of nutrients and pesticides is prone to surface runoff and groundwater leaching, causing damage to neighboring land. To demonstrate dissemination of such pollutants, we examine inorganic phosphorus as example of a common agrochemical. Students follow the movement of inorganic P into the groundwater. Gelatin gels containing inorganic P are prepared to obtain a continuous release of inorganic P with a controlled rate. The slow release of P allows fewer applications and less agrichemicals are needed, helping to prevent leaching with consequent reduction of groundwater contamination. Students compare the advantages of slow-release inorganic P versus its application by conventional methods.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Environmental Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Agricultural Chemistry
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  • Received: August 03, 2009

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