The phrase "affect the amount and" is correct and usable in written English.
It can be used when discussing factors that influence a quantity or degree of something.
Example: "Various factors can affect the amount and quality of the final product."
Alternatives: "influence the quantity and" or "impact the level and".
Meteorological conditions on Earth strongly affect the amount and colour of light that can penetrate the atmosphere.
The airborne particles in the atmosphere affect the amount and properties of the radiation finally reaching the collectors.
Analysts at Stifel say a surplus of corn on the market may affect the amount and type of farm equipment needed, which could affect Deeres bottom line.
It is not clear how deposited NH4+ and NO3− divergently affect the amount and stability of soil organic C (SOC) in the N-limiting forests.
Postfire recovery to a different vegetation type which may occur in response to changing climate, unusually high burn severities, or other factors also has the potential to affect the amount and rate of carbon storage on the landscape.
Case managers make decisions that directly affect the amount and type of services home care clients receive and subsequently affect the overall available health care resources of home care programs.
The in vivo experiments in Ni et al. (2012) on brome mosaic virus (BMV) showed that even charge-conserving mutations to ARM residues could affect the amounts and types of packaged RNA, possibly by interfering with coordination of RNA replication and encapsidation (Rao, 2006).
In conclusion, dietary NiCl2 affected the amount and diversity of intestinal microbiota in the ileum and cecum of broilers.
By applying a Generalized Linear Model (GzLM) it was shown that sea transport is the dominant pathway affecting the amount and variability in beach litter loadings.
The interaction between microbially-mediated nitrogen cycling and catchment hydrology affects the amount and isotopic composition of nitrate exported from catchments in drainage waters.
