Nutrient management and balanced fertilization on main crops in Ningxia province
IPNI-2006-CHN-NX4
28 Jan 2008
2007 Annual Interpretive Summary
Soil Nutrient Management and Balanced Fertilization in Ningxia, 2007
Experiments of nutrient management and balanced fertilization on wheat, corn, rice, potato, and vegetables (spinach and celery) were conducted in Ningxia in 2007.
An N x K interaction study on intercropped wheat and corn in Wuzhong County determined that application of 225-180-135 kg N-P2O5-K2O/ha resulted in the highest average wheat yield, which was 27% over the check (CK) treatment omitting N and K. In corn, the highest yield, 286% above the CK, was obtained by applying 450-180-135 kg/ha.
Rice within the Yellow River irrigated region represented 72,000 ha in 2007 or 21% of grain crops in the region. An optimum (OPT) fertilization experiment in Lingwu Village determined that balanced NPK use of 225-90-135 kg/ha could produce 67%, 22%, and 20% more yield than the - N, - P, and - K treatments, respectively. The OPT treatment returned US$422 to US$1,105 more income compared to the nutrient omission treatments.
Rainfed potato experiments in Xiji County found application of 90-90-90 kg/ha could produce 1,136, 605, and 383 kg/ha, or 5 to 15% more yield, than the - N, - P, and - K treatments, respectively. In irrigated potato, the same NPK treatment produced 2,101, 2,410, and 960 kg/ha, or 9 to 22% more tuber yield, than the - N, -P, or - K treatments, respectively.
In vegetables in Huinong County, the OPT treatment of 270-250-90 kg/ha produced 15% and 8% more spinach yield compared to the - N and - K treatments, respectively. No response to P application was noted for spinach. The OPT applied to celery was 300-225-150 kg/ha, which produced 37%, 9%, and 24% more yield, and US$3,370, US$753, and US$2,329/ha more income than the - N, - P, and - K treatments, respectively.
Demonstrations comparing potassium chloride (KCl) with no KCl in rice, wheat, corn, spinach, celery, watermelon, and melon showed 9%, 4%, 5%, 17%, 15%, 15%, and 12% yield increases; and US$272, US$50, US$88, US$1,663, US$1,886, US$615, and US$379/ha income increases, respectively. Ningxia-NMBF