HETEROGENEOUS GROWTH IN POT PLANTS
It is also possible to reduce the cost of production by growing the plants at optimum growing-conditions. In this way the production time will be shortened.
The results of these two different efforts, homogeneous growth and optimum growing-conditions are illustrated in fig. 1. It is assumed that the optimum growing-conditions do not decrease the plant heterogeneity (however, see later). Curve 1 represents the sale of a quantity of plants over a certain time, under current growing. Curve 2 shows the quantity of plants after growing with optimum conditions and curve 3 after reduction of the heterogeneity.
When the effort is put forward to make a homogeneous plant, it should be used in making the new quantity as good as the best plant in the previous quantity.
The standard deviation in a quantity of plants is usually symmetrical around the mean, and the aim is to decrease the standard deviation. The effort therefore is to make a quantity of plants which have a small standard deviation and utilize the best quality in the quantity of plants. In fig. 2 is shown the spread for 2 curves with the same mean (1 and 2), but with different standard deviations. Curve 3 has the same standard deviation as curve 2 but a different mean. The aim is to make a quantity of plants which have a mean and standard deviation as shown by curve 3, because the effort is the same when making a quantity of plants which represent curve 3, as when making a quantity of plants which represent curve 2.
It is necessary to know the reason for the heterogeneity of a quantity of plants. The reasons can be classified as follows: