PROBLEM SHIFTS INDUCED BY MODIFIED GROWING SUBSTRATES
Because of the important changes in systems and growing techniques, there is an evolution in the concepts of "garden" - "horticulture" - "horticultural growing". Productivity keeps rising due to the input of new, highly productive varieties and the evolution to improved nutrient supplies. We try to bridge unusual production periods, areas and circumstances by means of container cultures, climatic control, the use of fridge plants, drip irrigation, fertigation and other computer-controlled production modules. Beside the insight and the dynamics of the grower however, there is the dynamical character of the parasite which is enhanced, because pathogens might spread much faster due to the circulation via the water and there is no buffering effect from the soil. The specialist applying a narrow rotation schedule, is at the same time a specialised cultivator of parasites.
Concerning the input of pesticides, the one-eyed striving for effectiveness, has now shifted towards a better-founded efficiency as to selectivity and financial feasibility. Especially highlighted is the responsibility for the residue problem and other possible consequences for bio-identities, including man, biotopes and environment.