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

26 Feb 2010

2009 Annual Interpretive Summary

A Macronutrient Rate Study for Maize Production in Liaoning, 2009

Field experiments were conducted within the main maize production regions in Liaoning Province in 2009 to determine the range of appropriate rates of N, P, and K required to support maximum economic yields.

Field trial sites used for N rate study supported maximum yields of 10.3 t/ha at Gaizhou using 320 kg N/ha and 9.4 t/ha at Shenyang using 290 kg N/ha. However, maximum economic yields at these sites were 10.1 and 9.4 t/ha, respectively, with corresponding rates of 159 and 260 kg N/ha. Over all N rates, maize yields increased by 5 to 75%, with net benefits between US$21 to US$766/ha. The P rate study supported maximum yields of 8.9 t/ha at Shenyang using 32 kg P2O5/ha, 9.7 t/ha at Gaizhou using 76 kg P2O5/ha, and 9.9 t/ha at Fuxin using 110 kg P2O5/ha. Maximum economic yield at each site was 8.8, 9.7, and 9.8 t/ha, with corresponding rates of 30, 58, and 64 kg P2O5/ha. Maize yield responses to P application ranged between 2 to 8%, with net benefits between US$24 to US$136/ha. The Gaizhou field site used to evaluate K rate responses produced a highest yield of 10.2 t/ha using 126 kg K2O/ha. However, the maximum economic rate of 102 kg K2O/ha also resulted in a 10 t/ha yield. Maize yield responses to K application ranged between 3 to 20%, with net benefits between US$35 to US$307/ha. Liaoning-NMBF