[Maintenance of nitrates in plant production in depending on weather conditions and fertilizer application on sod podzolic light loamy soil]
2007
Bosak, V.N. | Mezentseva, E.G. | Dembitskaya, T.V.,National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute for Soil Science and Agrochemistry
The adverse weather conditions and growing dozes of nitric fertilizers have increased nitrate accumulation of in a potato, fodder beet, corn and annual legume-cereals grass mixes in researches on sod podzolic light loamy soil. At cultivation of a potato the doze of mineral nitrogen N120 can be counted as much as possible allowable, providing obtaining food potato tubers with contents of them of nitrates within the maximum concentration limit. In research with potato variety Orbit the content of nitrates essentially increased both within adverse weather conditions, and in variants with increasing dozes of nitric fertilizers. The greatest content of nitrates in tubers of potato is noted at the hydro-thermal coefficient of the period of vegetation 0,5-57 - 246 mg/kg. Increasing dozes of nitrogen fertilizers N60-150 increased the content of nitrates in tubers of potato depending on weather conditions by 4-56 mg/kg (at the hydro-thermal coefficient 1,5), 45-98 mg/kg (at the hydro-thermal coefficient 0,5) and 4-117 mg/kg (at the hydro-thermal coefficient 1,7); on the average for years of research – on 17-95 mg/kg. As a whole for three years of research a doze of mineral nitrogen N120 it is possible to consider as much as possible providing receiving tubers of food potato with the content nitrates in them within the limits of maximum concentration limit (maximum concentration limit = 150 mg/kg); maximum concentration limit for a fodder potato (maximum concentration limit = 500 m/kg) have not been exceeded in all skilled variants. In research with vetch-oat mixed crop the greater content of nitrates in green weight in variants with nitrogen application is noted at the hydro-thermal coefficient 2,7 (240-379 mg/kg) and at the hydro-thermal coefficient 1,3 (196-293 mg/kg). In research with pea-oat mixed crop increasing dozes of nitric fertilizers N30-90 increased the content of nitrates by 48 -151 mg/kg at their content in skilled variants within the limits of 112-304, that is lower than specifications operating of maximum concentration limit (maximum concentration limit = 500 mg/kg). In green weight of maize variety Rodnik (a phase of milk ripeness) the maximum content of nitrates is noted in a variant with separate nitrogen fertilizers application N90+30 a background of 60 t/ha of cattle straw manure (380 mg/kg)
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