Effects of combined application of slow-release nitrogen fertilizer and urea on nitrogen uptake, utilization and yield of maize under two tillage methods.

In this experiment, the dry matter accumulation, spike length, grain number per spike, 100-grain quality and yield of UNS treatment were better than those of S treatment and U treatment, because the dry matter accumulation of maize showed an increasing trend of “S” curve with time, and the dry matter accumulation of ordinary urea treatment was the fastest at jointing stage, followed by large flare stage.

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Nitrogen transport It can be seen from Table 4 that in all the treatments of the two-year experiment, the nitrogen uptake stored in the vegetative organs of maize plants at the tasseling stage was greater than that at the maturity stage, which indicated that the nitrogen stored in the vegetative organs was transferred to the grain after the tasseling stage, and it showed a trend of UNS > S > U > CK, in which the UNS2 treatment reached the maximum.

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