[Dependence between the content of mineral nitrogen in soil and maize yield]
2002
Latkovic, D.
For purposes of studying the dynamics of mineral nitrogen in the soil and its effects on the crop yield, dynamics of collected dry matter, its content and extracting N by sowing maize, we have carried out a research in a field experiment on the years old, stationary field of the Institute of Agriculture in Novi Sad, Serbia (Yugoslavia) in 1965. During the process of maize vegetation, we have observed a reduction in the quantity of mineral N in the soil because of the increased needs and intensive absorption by the plant (maize). The absorption of N was the smallest at the beginning of the vegetation process. The dynamics of absorption of dry matter changed depending on the stage of development and the quantity of mineral N in the soil. The greatest quantity of dry matter was formed in the period of starting of growth till the silk stage. On the controlled variant 60% of yield was formed, compared to the maximum yield, while on fertilised variant of the monoculture between 61.5% and 62.5%, and on the DVS+NPK variant 50.6% of dry matter was formed. The dynamics of N extraction changed according to the stage of development and the type of fertilizer. The least extraction of N was in the 7 leaves stage and it was 21.7% on average, compared to the maximum extraction in the full growth. The least grain yield was obtained on the controlled variant and the effect of the applied mineral and organic fertilizers in the monoculture was between 90-96% in 1993 and 128% in 1994.
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