Research was carried out on the possible yield increase of crops in The Netherlands by the use of PSS (partial soil sterilization) on the soil, on the basis of published as well as unpublished data and by experimentation with different disinfectants, soils and plants.Following review of the literature and the methods employed are chapters dealing w...
The influence of intermittent nutrition on dry-matter production, on contents (meq/kg) and amounts (meq per plant) of inorganic nutrients was studied in water and soil cultures with wheat as a test crop.From the results of this study notably from chapters 9 and 12 it is clear that differences between the techniques of water (2.1.1) and soil culture...
The growth and development of sugar-beet with different nitrogen dressings was studied by measurement of leaf area and of dry weight and chemical composition (inorganic cations and anions) of several plant parts during the growth season.For a correct interpretation of the data, the losses in dry weight, leaf area and minerals due to leaf fall could...
Differences in farm returns were analysed technically and economically. The study was of 29 arable farms of about 33 ha in the North-East-Polder in the area Lake IJssel. The farms there are very similar in size, soil, field layout and original farm building. The remarkable difference was in the farmers themselves. Each farmer made his own decisions...
