Agronomic evaluation of control-release urea (CRU) in maize and rice in Heilongjiang

The objective of this study was to explore the right rate of CRU and the right blending ratio of CRU to regular urea

IPNI-2013-CHN-HL

The objective of this project, initiated in 2015, was to study how regular urea (RU) can be substituted with controlled-release urea (CRU) to improve yield and N use efficiency of maize and rice in Heiongjiang Province. Treatments were designed to compare farmer’s practice (FP), soil test-based fertilization (OPTS), and combinations of NPK that substituted CRU for RU at various proportions and rates. Read more


Year of initiation:2013
Year of completion:2014

Interpretive Summary

2015

The objective of this project, initiated in 2015, was to study how regular urea (RU) can be substituted with controlled-release urea (CRU) to improve yield and N use efficiency of maize and rice in Heiongjiang Province. Treatments were designed to compare farmer’s practice (FP), soil test-based fertilization (OPTS), and combinations of NPK that substituted CRU for RU at various proportions and rates.

2014

The purpose of this project was to study the rate of control release urea (CRU) and blending of CRU with regular urea (RU) on yield and N use efficiency in maize and rice in Heilongjiang. Compared with RU application alone, various combinations of CRU (40 to 75%) plus RU (25 to 60%) produced 7 to 18% more grain yield, and 3. 8 to 11. 1 kg/kg higher agronomic efficiency (AE).



Project Leader

Yuying Li, Heilongjiang Academy of Agricultural Sciences


Project Cooperators

Shuganquan LIU


IPNI Staff

P. He
Rongrong Zhao


Location

Asia \ Eastern Asia \ CHN


Topics

4r rate, 4r source, nutrient use efficiency

maize, rice

Nitrogen (N)