Nontarget organisms

Organisms, particularly insects, that are unintentionally killed by crop protection chemicals. The most important are pollinating bees, and the agents of biological control. Normal distribution

The mathematical characteristics of a population in which a quantitative variable, such as horizontal resistance, shows every degree of continuous difference between a minimum and a maximum. The normal distribution is defined by two parameters: the mean or average, which locates the centre of the distribution, and the standard deviation, which determines the spread of the distribution. When plotted as a graph, the normal distribution is a bell-shaped or Gaussian curve. See also: Skewed distribution. Noug oil

See: Brassica carinata.

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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