Study on suitable methods for applying a rice-specific controlled-release fertilizer in Guilin rice area

Field trials were conducted with early and late rice to search for suitable methods for applying a rice-specific controlled-release fertilizer.Results illustrated that rational rate for the controlled-release fertilizer should be 636 kg/hm2 for early rice,which increased yield by 18.7%,15.1% and 9.5%,respectively over treatments of 561 kg/ hm2,711kg/hm2 of the controlled-release fertilizer,and local normal fertilization.For late rice,however,rational rate for the controlled-release fertilizer should be 773 kg/hm2,which increased yield by 14.8%,7.5% and 8.9%,respectively over treatments of 698 kg/hm2,848 kg/hm2 of the controlled-release fertilizer,and local normal fertilization.