Növénytermelés / Volume 61 / Issue 1 (March 2012) / pp. 55-66

Lásztity B

Nitrogen cycle of sorghum (Sorghum bicolor L. Moench) and calcareous sandy soil

We examined the plant nitrogen cycle and the change of the mineral nitrogen content of the soil in the 0–20, 20–40 and 40–60 cm layers in an NPK experiment on weakly humic calcareous sandy soil. Based on our findings, the following conclusions can be drawn:

Both forms of N were developed in the ploughed layer and their minimal amounts can be found in the 40–60 cm layers.

In all three layers, the highest nitrate content was detected at the beginning of the vegetation period, while the lowest was found at the end of this period and the change showed a decreasing tendency.

The N fertilisation applied in the treatment (NP, NPK) provided significant increase in the NO3--N and NH4+-N contents only in the spring in all three layers.

In comparison with the spring sampling, the ammonium contents decrease in the ploughed layer and there was accumulation in the deeper layers.

There were significant seasonal changes in the NH4+-N content, they are mostly in connection with the climatic, primarily rainfall changes.

The N cycle of the soil can only be evaluated in view of the chemical and physical soil characteristics, the nutrient supply ability of the soil and the environmental climatic factors.

Keywords: sorghum, N-cycle, sandy soil, long-term NPK fertilizer

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