Növénytermelés / Volume 65 / Issue 3 (September 2016) / pp. 65-78
With applying yearly 0, 100, 200 and 300 kg N ha-1, and several 0, 500, 1000 and 1500 kg P2O5 ha-1, or kg K2O ha-1 dose build up PK fertilization, last time in the autumn of 1999, poor, moderate, good, and excess soil NPK levels were established in the trial.
Grass hay yields and NPK contents varied according to the time passed since grass mixture sowing as well as according to the different soil NPK supplies. From the results, we got information about the crop year impacts, as well as the residual PK effects. Hay yields increased until N2–N3, P1–P2 and K1 levels. In the trial, grass hay NPK contents could be affected by the time elapsed since grass mixture sowing, as well as by the changing grass composition, the latter one depending on soil NPK supply as well.
The vegetative grass hay showed significant NK luxury uptake, the amount of NK uptake increased as far as N3K3 level. P “behaved” completely differently: similarly to hay yields, P contents increased only until P1–P2 levels.
From the difference between applied NPK amounts and grass NPK uptakes, we can get information about the specialities of NPK turnover in the different NPK treatments. N and P turnover showed similar characteristics, while K turnover was completely different from the other two macro nutrients.
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János Nagy
Debreceni Egyetem
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