engleski

Influence of mineral nitrogen fertilization on corn grain yield and nitrogen leaching

In a stationary field trial with 10 treatments in 4 replications corn was grown as test crop. Trial treatments are: 1. Check, 2. N0 PK, 3. N100 PK, 4. N150 PK, 5. N200 PK, 6. N250 PK, 7. N250 PK + Phosphogypsum, 8. N250 PK+Zeolite tuff+CaCO3, 9. N300PK, and 10. Black fallow. Nitrogen content has been determined in samples of soil, lysimeter water and plant material. Mineral nitrogen utilization is shown in terms of corn grain yields and the amount of mineral nitrogen applied, together with the results of chemical analyses for nitrogen content in soil and in lysimeter water. According to the results it is possible to conclude that sustainable mineral fertilizer rate for corn in the given agroecological conditions ranges between 150 and 200 kg /ha of mineral nitrogen. Additional amounts of nitrogen can cause increase in yield and in grain nitrogen content, but with stronger adverse effects on water quality.

corn; nitrogen; soil; water

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