THE INFLUENCE OF ORGANIC FERTILIZATION AND LIMING ON VEGETABLE YIELDS (ONION, CUCUMBER, CABBAGE) AT DIFFERENT LEVELS OF MINERAL FERTILIZATION
Sphagnum peat and brown coal (100 m3 per ha every year) almost free of nutrients were turned in as organic matter and calcium corbonate (1 or 2 tons per ha every year) was used as lime material. In the control level "O" of mineral fertilization only sufficient N dose (200 kg N or more as NH4NO3 per ha) was used every year to obtain defficiency effect of other nutrients. In 3 other levels the same N fertilization was used plus every year per ha: 200 kg P2O5 (superphosphat), 200 kg K2O (as sulfate) and micronutrients in "x 1 level" double doses of these fertilizers - in "x 2 level" and triple doses - in "x 3 level" to obtain both optimal yields and their decrease as effect of excessive salinity (in "x 3" and perhaps "x 2" level).
The optimal cabbage yields (average of combinations ± organic matter and or ± line) were obtained in most years at