Nutrient management and balanced fertilization on main crops in Ningxia province

IPNI-2006-CHN-NX4

23 Jan 2009

2008 Annual Interpretive Summary

Soil Nutrient Management and Balanced Fertilization in Ningxia, 2008

Nutrient management experiments were conducted in 2008 in order to develop optimum (OPT) fertilizer recommendations for wheat, rice, potato, cabbage, and celery.

Spring wheat was tested using a series of N, P, and K rates in Wuzhong City, which determined 240 kg N/ha, along with 120 kg P2O5/ha and 90 kg K2O/ha, to be most suitable. The treatment produced a high yield of 5,280 kg/ha and best agronomic efficiencies (AE = kg grain increase per kg nutrient added) of 4.9 kg grain/kg N and 5.2 kg grain/kg P2O5. The N x K interaction study on rice in Lingwu County determined 225-90-135 kg N-P2O5-K2O/ha to be the high yield option. This OPT treatment delivered AE values of 19.4 kg grain/kg N and 6.3 kg grain/kg K2O. Rate and K source experiments on potato in Xiji County found tuber yield increases as K rate increased from 75 to 300 kg K2O/ha. No significant differences were found between the potassium chloride (KCl) and potassium sulfate (K2SO4) sources. Application of 90-90-300 kg/ha produced the highest tuber yield regardless of source. In cabbage grown in Huinong County, the OPT treatment was 300-100-150 kg/ha. Agronomic efficiency for N, P, and K was 283 kg cabbage/kg N, 433 kg/kg P2O5, and 131 kg/kg K2O, respectively. Ningxia-NMBF