Nutrient Management and Optimized Fertilization on Maize in Heilongjiang Province
The project has been focusing on Nutrient Expert based fertilizer recommendation since 2011
IPNI-2006-CHN-HL18
26 Feb 2010
2009 Annual Interpretive Summary
Nutrient Limiting Factors for Maize, Soybean, and Rice Production in Heilongjiang, 2009
Field experiments were conducted to study yield limiting nutrients within main production centers for maize (four sites), soybean (five sites), and rice (three sites) in the province. Optimum (OPT) treatments providing nutrients adjusted to levels guided by soil testing were compared against site-specific sets of nutrient omission plots.
In maize, the best yields, ranging between 8.5 to 12.6 t/ha, were produced under the OPT treatments. Yields were most affected by N omission but were also significantly lower without P or K. Specifically, N omission produced yield losses between 20 to 42% which is a range valued between US$232 to US$768/ha. Yields under P omission dropped by 10 to 27% (US$105 to US$525/ha) and K omission caused a 11 to 19% yield loss valued between US$122 to US$372/ha. At Yi-an, which is located in western Heilongjiang, Zn deficiency was also identified. Omitting Zn from the OPT reduced maize yield by 38% which represents a value loss of US$639/ha. In soybean, the OPT produced the best yields, which ranged between 1.6 to 3.2 t/ha. Omission of P reduced soybean yield by 10 to 26%, valued between US$289 to US$500/ha, and omission of K caused a 7 to 38% yield loss valued between US$219 to US$588/ha. In rice, again the OPT produced the best yields, ranging between 6.6 to 8.5 t/ha. Rice was impacted the most by N omission which caused yield losses between 26 to 48%, valued at US$628 to US$1,270/ha. Omitting P from the OPT lowered yield potential by 20 to 28% (US$207 to US$688/ha) and K omission caused a 13 to 26% yield loss valued between US$163 to US$601/ha. Heilongjiang-NMBF