“mainly increase” is correct and can be used in written English.
You can use it to convey that something has increased or is increasing predominantly. For example: “The recent stimulus package mainly increased government spending.”.
Results indicate a trend for increased landscape fragmentation, decrease of annual crop fields (−43%) and, mainly, increase of meadows (+60%).
Without ion bombardment, high temperatures mainly increase the energy of adatoms, enabling the thermodynamically favorable orientation (200) to be achieved.
In addition, the increase of ammonia solution flow rate would mainly increase the interphase area and promote both CO2 absorption and NH3 escape.
For cities with varying congestion during daytime like Stockholm, the results suggest that night-time deliveries mainly increase the scheduling flexibility of carriers and recipients through the introduction of additional off-peak hours.
This development would mainly increase the number of traits mentioned above to 114.
For lower energy protons, the resonant frequencies mainly increase with magnetic latitude, gradually approaching the upper limit of the wave spectrum.
Its risks were thought to be limited — mainly increased susceptibility to breast cancer and gallbladder disease.
Our population is mainly increasing from legal and illegal immigration and the higher birth rate of immigrants.
By chemical identification, the alteration of Fe-smectites is mainly increased by the smectitization process.
These results indicate that EPA mainly increases the number of anti-inflammatory adipose immune cells regardless of body weight and adipose tissue size.
They are also proposing $41m a year in service cuts, mainly increasing the time between trains and buses on some routes.
