Abstract: The effects of nitrogen and potassium on yield and quality of Nanjing 44 (Oryza sativa L. ) were studied with the design of double saturated D-optimal regression. Meanwhile,a mathematical model was established,in which the nitrogen and potassium fertilized were independent variables,and the yield of Nanjing 44 was dependent variables. The results of quality showed that nitrogen and potassium significantly affected appearance quality and nutrition quality of Nanjing 44. A higher amount of nitrogen significantly reduced taste value of the rice,while a certain amount of potash fertilizer correspondingly improved taste value of the rice. The models analysis also showed that nitrogen and potassium could significantly influence the yield of Nanjing 44,and nitrogen had heavier effect than potassium. At the same time,there was significant interaction between nitrogen and potassium. Within the amount of urea 750 kg /ha,KCl 366 kg /ha,yield increased with the increase of fertilizer. According to computer simulation,the most suitable amounts of fertilizer for over 9 289. 5 kg /ha yield of Nanjing 44 were urea 325. 5－750kg /ha,KCl 228－366 kg /ha.

Key words: Rice, Nitrogen, Potassium, Yield, Quality

CLC Number: 

• S143.1