It was indicated in this experiment that the yields of the rice after using of 5.5

7.5

9.5 and 11.5 kg. N/mu of (NH

4

) HCO

3

were 138.9

206.1

220.6 and 270.6 kg/mu respectively. They are higher than control. There was no significant difference for yields of rice between the using of 9.5 and 11.5 kg/mu. It was shown in the pot experiment hat percent utilization of fertilizer was increased with nitrogen applied. By the same amount of nitrogen applied

phosphorous fertilizer abled to promote nitrogen uptaken and yield of rice. It was found that the N to P

2

O

5

ratio of 19:9.5 was optimal for the Lutai Farm. There is no significant difference of yield of rice and percent utilization of fertilizer between (NH

4

) HCO

3

and Ca (H

2

PO

4

)

2

. The yield of rice is 10% higher for NH

4

HCO

3

in whole ploughing layer base dressing than top dressing.