at weekly intervals

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These were obtained by planting the crop at weekly intervals in an outdoor mesh-covered insectary.
Germinated seeds were counted and removed and distilled water added at weekly intervals.
The 5 clones were maintained in vitro for up to 39 days and immunofluorescent analysis carried out at weekly intervals.
Four parameters were measured in the body and pharyngeal region at weekly intervals.
The number of germinated seeds was recorded at weekly intervals.
Afterwards, irrigation was applied at weekly intervals with amounts equivalent to the sum of the pan evaporation less rainfall during that period.
Both the honey and the cotton sticks were replenished at weekly intervals and care was taken to keep cotton sticks wet.
Fenthion is sprayed at weekly intervals at a dosage of 0.78 ml/1 in polluted water, drains and trenches, which are the major breeding sites.
The sera were collected from the rabbits 1 week after infection and at weekly intervals for up to 9 weeks.
Freshly hatched miracidia were added to the tank at weekly intervals.
At weekly intervals adult mortality and nymphal presence were recorded for a 40-day period.
The capitula were harvested at weekly intervals during the seed formation stage.
Thereafter, seeds were collected at weekly intervals until commercial harvest time.
Thereafter, irrigation was applied at weekly intervals with amounts equivalent to the sum of the pan evaporation less rainfall during that period.
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