Abstract: Field experiments and laboratory analysis methods were used to study the effects of spraying different concentrations, dosages and times of plant nutrients on the essential amino acid content in white rice from 2017 to 2018. The results showed that the essential amino acid content of rice was increased from concentration of plant nutrients 8.0%~16.0%. The application of 11.0% plant nutrient was 61.875 kg/hm² per dose, the application in the field was 562.5 kg/hm² per dose. The essential amino acid content of white rice reached 3 310.6 mg/100 g,which was 16.73% higher than that of the control. The application of 16.0% plant nutrient was 30.000 kg/hm² per dose, the application in the field was 187.5 kg/hm² per dose. The essential amino acid content of white rice reached 3 156.6 mg/100 g,which was 10.96% higher than that of the control,but burns were produced by using this concentration on Xiangzaoxian 45. In order to save cost, reduce spraying amount and maximize the content of essential amino acids in rice, in practical application, the concentration of plant nutrients is 10%, the dosage of plant nutrients is 56.25 kg/hm² per dose, the dosage of plant nutrients solution is 562.5 kg/hm² per time in the field, and it is sprayed once at the end of booting and full heading stages.

Key words: plant nutrients, rice, essential amino acids, application technology, rice quality