THE USE OF SOIL AND PLANT ANALYSIS FOR THE FERTILIZER RECOMMENDATION DEVELOPMENT FOR VEGETABLE CROPS
According to the results of such experiments done already the particular vegetable crops show in the same rotation different fertilizer needs. For example on the clay loam soil of the Mordowski Experimental Station the tomato plant has shown the greatest phosphorus fertilizer needs, the cabbage plant - the greatest nitrogen fertilizer needs and the carrot plant - the greatest potassium fertilizer needs .
The fertilizer field experiments are labour consumming and very expensive and therefore other methods of determining fertilizer needs - soil analysis, leaf analysis and visual observations of plants are very important in practice.
In the fertilizer recommendations development the biological features of plant nutrition should be also taken into account: the total nutrient need of the plant and the dynamic of nutrient uptake in respect to different growth phases or periods. Attention should be paid to the Homes method of systematic variants  that enables to find out the optimal level of nutrient intensity and balance and to the