Nutrient management and balanced fertilization on main crops in Ningxia province
IPNI-2006-CHN-NX4
20 Jan 2012
2011 Annual Interpretive Summary
Nutrient Management and Balanced Fertilization in Ningxia, 2011
Two experiments were conducted in 2011 in Ningxia province to: (a) investigate limiting nutrients for maximum rice yields by comparing the yields in optimal treatment (OPT) with yields obtained in nutrient omission plots; and (b) determine the optimal K rate for cabbage.
An OPT trial in rice was conducted in Lingwu city. Results showed that the average yield with recommended OPT (225-90-75 kg N-P2O5-K2O/ha) was 10,292 kg/ha, which was 141%, 4%, and 2% more than that obtained plots omitting N, P, and K, respectively. This indicated N as the main limiting factor in rice production in Ningxia, while P and K were found to be sufficient.
A potash rate trial in cabbage in Lingwu showed that increasing K rates increased cabbage yield by 13.1% to 20.8%. The highest cabbage yield was obtained with 300-150-225 kg N-P2O5-K2O/ha treatment. Increasing K rates to 300 kg K2O/ha reduced cabbage yield by 6.7%. However, there was no statistically significant yield difference between 225 and 150 kg K2O/ha treatments. Economic analysis showed that the highest income (USD 300/ha) was obtained in 150 kg K2O/ha treatment, which incidentally also had higher K recovery efficiency of all K treatments. In summary, the appropriate rate of K in cabbage in Lingwu, Ningxia, was found to be 150 kg K2O/ha. Ningxia-NMBF