Correcting the nitrogen deficiency of winter wheat at the beginning of stem elongation on soils improved as concerns reaction and phosphorus level
1984
Vintila, I. | Stefan, O. | Nitescu, S. (Institutul de cercetari pentru pedologie si agrochimie, Bucuresti (Romania))
In a pot experiment winter wheat was cultivated on two slightly acid soils optimum supplied with available phosphorus. At the end of tillering very deficient nitrogen concentrations in plants have been found (N/P = 4,8-5,5). The nitrogen fertilization at the beginning of stem elongation, in doses up to 150 kg N/ha, determined no damages to the young plants but significant yield increases. High correlations were established between nitrogen rates and nitrogen concentrations in the two upper leaves of winter wheat at heading, nitrogen rates and grain yields, nitrogen concentrations in leaves and grain yields. Preliminary limits for interpreting foliar analysis of winter wheat at heading are presented.
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