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In this study we followed the monitoring of nitrate and nitrite content in kohlrabi after the administration of organic and mineral fertilizers in different doses. Kohlrabi samples (GIGANT hybride) for the analysis have been taken from an experimental field established in Mosnita, near Timisoara. In the experimental field to kohlrabi have been admi...
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... Nitrate content registered in the cauliflower samples variant V 2 (254 ppm) had similar values with values obtained for the variant fertilized with manure V 4 (244 ppm). Maximum level of nitrites in plant products is not covered by actual Law, but according to studies in the literature, it should not exceed 1-5 ppm12345678. Nitrite content determined from the cauliflower inflorescence had values within the range allowed of 1- 5 ppm (V 1 -0.1 ppm, V 2 -1. 3 ppm , V 3 -2.5 ppm, V 4 -1.5 ppm ) (Figure 10). ...
... [3].Figure 12) thus exceeding MAL of 1500 ppm, because nitrogen is found from beginning in available form for plants, unlike the variant V 5 fertilized with organic compost, which registered a value of 746 ppm because organic substances from compost are mineralized by soil micro organisms, only after this process, is constitute forms available for plants. Nitrite content recorded higher values in variant V 3 -2.6 ppm, V 4 -3.8 ppm and V-52.7 ppm, fertilized variants with high doses of mineral and organic fertilizers, but was not exceeded the limit of 5 ppm (Figure 12). [2].190 ppm). ...
... te content recorded higher values in variant V 3 -2.6 ppm, V 4 -3.8 ppm and V-52.7 ppm, fertilized variants with high doses of mineral and organic fertilizers, but was not exceeded the limit of 5 ppm (Figure 12). [2].190 ppm). Nitrite content does not exceed 5 ppm in any of the studied variants, kohlrabi is proper for human consumption (Figure 13). [2]. Nitrate content in lettuce and spinach is well below MAL of 2000 ppm in all experimental variants, while the values obtained for the carrot approach, but not exceed MAL of 400 ppm. The range of nitrate content for analyzed species is: 95-421 ppm for lettuce, 119-432 ppm for spinach, 85-366 ppm carrots and 109- 313 ppm in cabbage. Nitri ...
This paper aim is to study the influence of agro-technique methods, applied in vegetable crops: lettuce, spinach, carrots, cabbage, kohlrabi and cauliflower, on their quality. In the period 2005-2007 were grown in an experimental field of Becicherecul Mic, lettuce, spinach, carrots and cabbage crops and it was applied different doses of synthetic and organic fertilizers. Also, in Mosnita Noua was founded an experimental field with cauliflower and kohlrabi, in which we have applied different doses of fertilizers. Samples were taken at full maturity of plants and the analyses were made in the Laboratory for residues determination of Faculty of Horticulture and Forestry. Chemical parameters studied in the plant samples were: nitrate, nitrite and ammonium ions. Through share that takes in population food, consumption of vegetables is an indicator for assessing the standard of living, vegetables culture with a high economic significance, constituting an important source of income for farmers, applying corresponding technology and using high quality biological material. In Romania, fresh fruit and vegetable sector has a higher share of total agricultural production to the EU average. [4]. Analysts believe that the Romanian market trend is to orientation of fruit and vegetables use locally produced, considered with natural flavour. Currently, the Romanian vegetable production covers over 70% of urban consumption while the fruit percentage is 20%. Against the countries of Central and Eastern Europe, Romania ranks in the third place of total area planted. This places it much before the next class (Hungary, about 140,000 ha), but far behind of the first and the second position, that Russia, with 5 million hectares, and Poland, with one million hectares planted with vegetables. Even if the surface area increased slightly in the last five years, local production of vegetables has been fluctuating amid weather events and poor management of agricultural activities. Regarding to vegetable consumption per person, it shows an increasing trend, from 151.1 kg in 2001, currently at about 230 kg. Thus, per person consumption is about 1.3 times higher than in Bulgaria and 1.7 times higher than in Hungary. [5]. Chemical products use had a capital contribution in agricultural development, to provide to humankind agricultural products. Annually, chemical fertilizers bring an increase of 40% of world cereals production and pesticides saves about 30% of obtained harvested. Reverse of beneficial action of chemical products use in agriculture is the environmental pollution and depreciation of plant and animal product quality and therefore of human life. Nitrate content is an important quality characteristic of vegetables. Vegetable nitrate content is of interest to governments and regulators owing to the possible implications for health and to check that controls on the content are effective. Nitrate itself is relatively non-toxic but its metabolites may produce a number of health effects. Until recently nitrate was perceived as a purely harmful dietary component which causes infantile methaemoglobinaemia, carcinogenesis and possibly even teratogenesis. Recent research studies suggest that nitrate is actually a key part of our bodies' defenses against gastroenteritis [6].
