Voeding van de plant via het blad

Ook via het blad kunnen aan de plant voedingsstoffen worden toegediend. Van deze wetenschap, die vooral belangrijk is met het oog op een snelle opheffing van voedingstekorten, wordt in de praktijk reeds gebruik gemaakt. De praktische uitvoering van deze mogelijkheid stuit op weinig moeilijkheden, daar de meeste land- en tuinbouwbedrijven tegenwoordig wel over sproeiwerktuigen voor de ziektebestrijding beschikken

De zoutvegetatie van ZW-Nederland beschouwd in Europees verband

The results were discussed of an ecological study of salt marsh vegetation along the estuaries of the rivers Scheldt, Meuse and Rhine (incl. the Eastern Scheldt) as a part of European halophytic vegetation.Communities were classified by the Swiss-French system of Braun Blanquet. Special attention was devoted to a cybernetic approach to the vegetation and its habitat as accomplished in space and time.Environmental aspects considered included the stable borders between the Arctic, Atlantic, Continental and Mediterranean climatic types along the West European coast, the ecological significance of tides, the origin of mud flats and salt marshes, physical and chemical properties of the soil and their relation to sedimentation, and biotic factors. choice between intraregional and interregional classification could be based only on floristic relationships. Existing, mostly regional systems could be combined into a single classification scheme for the whole European halophytic vegetation.Finally West European salt marsh communities, including tidal drift communities, were described, especially those of the south-west Netherlands