the length of day (LOD) method and satellite orbit perturbation (SOP) method to study the long period solid Earth tide Love number k 2.

the variation of length of day (LOD) determined by space techniques and the geopotential coefficient ( Δ J 2) derived from satellite laser ranging (SLR), are used to study the decadal fluctuations in LOD.

Accurate observation of the decade variation in length of day (△LODY)for 1800-1995 has shown that they are most pronouned and well above the observational noise level.

With the wind, pressure and sea surface temperature (SST) data provided by NCEP/NCAR reanalysis project and excess length of day (LOD) data provided by International Earth Rotation Service (IERS), atmospheric angular momentum (AAM) and its horizontal and vertical transportation are computed and analyzed, which are in accordance with maintenance of the zonal circulation.

The results were as follows: The responses of the fertilities of the wheat nucleus substitution lines of Aegilops Crassa 4X and 6X on day length(DL) were sensitive,and fertilities decreased with DL lengthening.

(2) Agradually increasing daylength (from 13 h 24 min to 14 h 21 min) with a moderately tempera.

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