Nutrient management and optimized fertilization on selected crops in Liaoning province

The project has been focusing on Nutrient Expert based fertilizer recommendation since 2011

IPNI-2006-CHN-LN6

18 Feb 2009

2008 Annual Interpretive Summary

Soil Nutrient Management and Balanced Fertilization in Liaoning, 2008

A total of 176 plow layer soil samples were taken from 23 main maize-producing counties in Liaoning Province, covering about 50% of maize production area in the province. Results from soil analysis indicated that all soils were low in N [ammonium (NH4-N) form], 66% of soils were low in available P, 72% were low in available K, and 70% were low in available Zn.

Field experiments designed to determine optimum N, P, and K rates were conducted in Haicheng, Zhangwu, and Changtu counties. Results indicated that N application increased maize yield by 520 to 3,765 kg/ha (6 to 75%), with net benefits ranging between 180 to 3,940 Yuan/ha (US$27 to 580/ha). The optimum N rates for Haicheng, Changtu, and Zhangwu sites were 208, 250, and 206 kg N/ha, respectively. Results indicated that P application in the three sites increased maize yields by 275 to 2,030 kg/ha (3 to 26%), with a net benefit ranging between 170 to 2,310 Yuan/ha (US$25 to 340). The optimum P rates for Haicheng and Zhangwu sites were 77 and 100 kg P2O5/ha, respectively. For K fertilizer, results indicated that K application in the three sites increased maize yield by 220 to 2,410 kg/ha (3 to 33%). In the low soil K soils, the net benefit ranged between 2,050 to 2,295 Yuan/ha (US$300 to 338/ha). The optimum K rates for Haicheng, Changtu, and Zhangwu sites were 73, 67, and 100 kg K2O/ha, respectively. Liaoning-NMBF