Nitrogen balance in three fertilization systems
2004
Sosulski, T. | Mercik, S. | Szara, E.,Szkola Glowna Gospodarstwa Wiejskiego, Warszawa (Poland). Zaklad Chemii Rolnej
Nitrogen balance for 5 years (1997-2001) was studied in three fertilization systems (only mineral, mineral and organic and only organic) in the long-term fertilization experiments caried out on the Experimental Fields in Skierniewice (since 1923), belonging to Warsaw Agricultural University. Dose of nitrogen in ammonium nitrate and farmyard manure (FYM), N uptake by plants and changes of total N content in a 0-65 cm soil layer for 5 years (one crop rotation) on fertilization systems were considered in the calculation of the N balance. Nitrogen uptake by plants was about 23-27 kg N/ha on the plots fertilized only with PK in mineral fertilization system. On the same fertilizer object (CaPK) but on the field with mineral-organic fertilization system and with legumes, the N uptake by crops was 4-5 times higher than only in mineral system. Percentage of nitrogen uptake by plants from the ammonium nitrate in only mineral fertilization system (CaNPK) ranged from 57-63 percent and 34 percent on mineral organic system. Utilization of N by crops from FYM was much lower in comparison to the mineral fertilizers and reached only 19 percent. The calculations of nitrogen balance indicate that the loss of N from ammonium nitrate was much lower (34-40 percent)in only mineral fertilization system than in mineral organic fertilization system (63 percent). The total N losses from plots treated with ammonium nitrate, FYM and legumes in the crops rotation were much lower (13 percent of the total N incom) than from the soil with only mineral system (24-25 percent of the total N incom). The highest N losses from the soil were in only organic fertilization system (48 percent of the total N incom)
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