ISHS Acta Horticulturae 82: Symposium on Production of Protected Crops in Peat and other Media
PLANT SPECIFIC NUTRITION AND PREPARATION OF NUTRIENT SOLUTIONS |
| Author: | M. Hansen |
| Abstract:
Addition of plant nutrients to cropping systems such as plant, medium, atmosphere, water and dissolved nutrients may be performed according to the plant-consumption of nutrients. The amounts and the composition of nutrients consumed by the plants can be estimated fairly accurately in closed systems when plants are growing in inert media or in pure hydroponics. The consumption of plant nutrients will affect the fertility of the cropping system and this estimate of a plant specific consumption may not be an ideal estimate. Analysis of a specific crop at maturity may describe the consumption of the various elements typical of the particular crop. Whenever the sampled and analysed plant material is selected as being of desirable quality the analysis yields an inventory of a possible, desirable ontogenetic nutrition of the crop in question Application of nutrients may be performed according to analysis of the total plant and quantitatively adjusted to the rate of growth and the amounts of water supplied. A plant successfully grown without altering the pH og the soil water or the substrate may be analysed and the analytical data provides the means of calculating a desirable ratio between NH4+ and NO3-. | |
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