Studies on the utilization of late-season applied fertilizer nitrogen in field and model experiments with winter wheat
1998
Berecz, K. | Debreczeni, K. | Presing, M.
The utilization of nitrogen (15N)-fertilizer was studied with winter wheat grown under field conditions and in a model experiment using large pots (70 kg soil pot-1). Fertilizer N (160 kg ha-1, 2 g pot-1) was applied in two or three different doses timed in the period between the beginning of tillering and that of flowering in both experiments. The field experiment contained also a fall N timing treatment. Both experiments were carried out with the same soil type and wheat variety. The N content of the tested plant parts (rachis, glumes, flag-leaf blade, flag-leaf sheath, upper most internode, and lower plant part) was found to be the highest in treatments including the fall applied or early spring N doses. Eighty-eight percent of the N detected in the uppermost internode depleted during the period between 72% grain moisture content and full ripening. It is concluded that besides the uppermost internode and flag-leaf, the glumes, as potential N sources, may also play an important role in the N translocation into the grains. The wheat plants grown in pots and watered were able to incorporate into the grains about 50% of the late N doses even though distributed at flowering. The favorable effect of late-season N application, however, could not be statistically proved. Under field condition, the grains could not utilize the late applied N doses and there could not be detected any favorable effect of late-season N application either in the experimental year, which was very rainless especially in the period most important from the point of view of grain development.
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