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Interpretive Summaries:
2005 - Soil Nutrient Management and Balanced Fertilization in Ningxia
2004 - Studies on Soil Nutrient Management Technology in Ningxia
2003 - Soil Nutrient Management and Fertilizer Use Strategies in Ningxia
2002 - Soil Nutrient Management and Fertilizer Use Strategies in Ningxia
Soil Nutrient Management and Balanced Fertilization in Ningxia, 2005
Rice trials and demonstrations were conducted within a monitored seed-breeding farm in Lingwu City and experiments and demonstrations were conducted on vegetables grown inside the monitored village of Ligang in Huinong County.
Rice within the Yellow River irrigated region represented 62,280 ha in 2005 or 20% of grain crops in the region. Traditional fertilization management has consisted of nitrogen (N) and phosphorus (P) applied at 250-60 kg N-P2O5/ha without consideration for potassium (K) fertilization. An experiment designed to identify the optimum (OPT) fertilization rate for rice determined that N, P, and K increased yield by 42%, 2%, and 6%, respectively. The most economic yield of 9.27 t/ha, which returned US$337/ha, was obtained with 345-225-375 kg N-P2O5-K2O/ha. A related field demonstration showed that application of 150 kg K2O/ha along with traditional N and P application rates increased yield of rice by 8% and increased farm income by US$98/ha. Adequate K also increased thousand-seed weight by 2.3 g, decreased disease by 15%, and reduced the rice lodging rate by 20%.
Huinong County presently has 50,654 ha planted to vegetables. A cabbage experiment demonstrated highest economic yield of 135.4 t/ha, which returned US$2,190/ha, if fertilized with 315-270-300 kg/ha. Field demonstrations showed that, compared with the traditional application of 225-150 kg N-P2O5/ha, application of 75 to 120 kg K2O/ha increased yield (and income) of cabbage, celery, onion, leek, and spinach by 24% (US$641/ha), 24% (US$1,760/ha), 13% (US$388/ha), 12% (US$252/ha), and 11% (US$824/ha), respectively, if compared to traditional fertilizer management without K. Ningxia-NMS02
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