Scientific assessment of fertilization of vegetable production is among the conditions of sustainable agriculture and reduction of health risk. The aim of this work is to ectablish the impact of increasing rates NPK-fertilization on the indicators characterizing the quality of cabbage-late field production. In terms of experience on the Alluvial-Meadow Soil in the Experimental Station-Tcalapica (Plovdiv) is planted cabbage. Tested are 4 combinations of nitrogen, phosphorus and potassium fertilizer. It was found that with increased fertilizer application rate of T_1 (N_12P_0K_0) to T_4 (N_24P_12K_1) the content of dry matter in cabbage falls of 13.27 to 10.95%. Maximum values of total sugars in the cabbage (9.3%) and internal cobs (7.6%) are measured in plants with the most high yield version of T_3 (N_18P_9K_9). Plants with combined fertilization T_2 (N_12P_6K_6) have higher sugar content -8.9%, of these self-contained nitrogen fertilization T_1-8.5%. In the case of mineral fertilizer, ensured the highest yield (T_3) is obtained and output with the high content of vitamin "C"-269.5 mg%. With the increase in fertilizer rate quantity of nitrogen, in the form of nitrates of 17.52 mg/kg fresh mass at variant T_1 to 72.66 mg/kg fresh mass at T_4. In phase "marketing maturity" plants with N_24P_12K_12 have in their production 321.8 mg NO_3/kg fresh weight in cabbage at N_12P_0K_0.
展开▼
