Uticaj tehnologije gajenja na dinamiku mineralnog azota u zemljištu različitog nivoa plodnosti

The variability and accessibility of NO3-N in the soil derives from the complex interaction of mineralization and ecological conditions. The results showed that in unfertilized two-year rotation conditions for mineralization had the most dominant effects on distribution and dynamics of NO3-N. However, in the fertilized rotation NO3-N dynamic and distribution was a result of mineral N application, plant assimilation and mineralization. In our agro-ecological conditions year to year NO3-N variations were extensive. However, without the addition of nitrogen potential NO3-N released from the mineralization is not sufficient for achievement of high yields. Moreover, fertilization must be based on Soil Fertility Control System.Varijabilnost pristupačnog NO3-N u zemljištu posledica je interakcije mineralizacije i faktora spoljne sredine. Dobijeni rezultati pokazuju da na neđubrenom dvopolju dominatnu ulogu na distribuciju i dinamiku NO3-N imaju uslovi za mineralizaciju. Na đubrenom dvopoljnom plodoredu N-đubrenje i brzina mineralizacije utiču na mobilnost azota i njegovo usvajanje biljkama. U našim agroekološkim uslovima najveća količina mineralnog azota je pristupačna u proleće. Međutim bez dodavanja planiranih količina mineralnih đubriva nije moguće realizovati potencijal prinosa gajanih biljaka. Pored toga neophodno je da se đubrenje obavlja prema principima Sistema kontrole plodnosti zemljišta