Ciência Rural · 2017
Soil solution and plant nitrogen on irrigated rice under controlled release nitrogen fertilizers
Veçozzi, T. A., Sousa, R. O. D., Scivittaro, W. B., Weinert, C., Tarrillo, V. R. C.
Abstract
A study was conducted to evaluate the solubilization and nitrogen (N) use efficiency (NUE) of controlled release nitrogen fertilizers in irrigated rice, compared to urea. It was developed under semi-controlled conditions, including five treatments: Control, Splitted Urea (pre-sowing and topdressing), Pre-sowing urea, and Polymer Coated Urea (PCU) with 60-day and 90-day release. PCUs did not maintain high NH4 + and NO3 - levels in solution over a longer period than urea. NUE of PCUs was similar to uncoated urea, not increasing nutrient release in irrigated rice field.
Findings
What changed what, as the paper reports it. Grouped by the measured property. The largest groups are open; open the others as you need them.
N content in rice shoots
↑ 1= 23
- no effect
PCUs (60 and90)
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