Abstract: The rice gro wth s tatus and utilization ratio of ni trogen fertilizer under the condi tion of dif ferent soil perme ability in the nethouse were inves tigated by ¹⁵N tracer and imi tat ive soil c olumn technique.The resul ts showed that the soi lwi th 20～30 mm/ d of the leakage speed was of most favorable to rice growth. When the soil permeabi li ty was over 40mm/ d or 0 mm/ d, the numbers of rice effective ti llering decreased obviously, and the biological and economical yield at harvest period were 66. 7% ～93. 4% and 65. 2%～ 93. 8% of the treatment in comparing wi th the optimum soi l permeabi li ty, respectively.The util ization rat io of ni trogen fertil izer exceeded 60% when rice was planted in the soil with opt-imum permeabil ity, but i t was only 32. 6%～44. 1% when planted in the other soil and the N loss reached 30. 8% ～46
0%. The pH of surface soi l (0 ～5 cm) and surface water was negat ively correlated wi th soil permeability. Poordrainage was easy to resul t in more N los s by NO₃ volati lizat ion. 20～30mm/ d of soil leakage speed could be considered as an quanti tative inde x for high yield soil along the Yel low River.

Key words: Rice and wheat rotation, Rice¹⁵N trace technique, Utilization ratio of N fertilizer, Soil permeability

CLC Number: 

• S511