Soil Fertility Clock-Crop Rotation as a Paradigm in Nitrogen Fertilizer Productivity Control.

The Soil Fertility Clock (SFC) concept is based on the assumption that the critical content (range) of essential nutrients in the soil is adapted to the requirements of the most sensitive plant in the cropping sequence (CS). This provides a key way to effectively control the productivity of fertilizer nitrogen (N). The production goals of a farm are set for the maximum crop yield, which is defined by the environmental conditions of the production process.

Does Elemental Sulfur Act as an Effective Measure to Control the Seasonal Growth Dynamics of Potato Tubers ( L.)?

The in-season dynamics of potato tuber biomass (TTB) growth requires effective nitrogen (N) control. This hypothesis was tested in 2006 and 2007. The two-factorial experiment with two rates of N (60, 120 kg ha) and sulfur (S; 0, 50 kg ha) was carried out in the split-plot design.