The phrase "as the main constraint" is correct and usable in written English.
It can be used when discussing a primary limitation or restriction in a particular context, such as a project or analysis.
Example: "In our analysis of the project's feasibility, we identified budget limitations as the main constraint affecting our timeline."
Alternatives: "as the primary limitation" or "as the key restriction".
Traditional planning of a substation takes the substation siting to meet "N − 1" load rate criteria as the main constraint.
With more practical primary traffic scenarios (i.e., a primary signal arrives at or leave for the channel at any time during the data transmission duration), the collision probability has been used as the main constraint in the literature.
Lee and Akyildiz [10] take the collision probability (referred to interference ratio) as the main constraint for primary user protection, and derived both the optimal sensing duration and interval achieving the maximum throughput for secondary users.
In particular, the lack of human resources for health (HRH) is increasingly being identified as the main constraint [ 4].
Among the leading retailers, limited and irregular supply is seen as the main constraint for further expansion of the fruit and vegetables market.
Selection for function should not be rejected as the main constraint on protein evolution or the dominant determinant of protein evolutionary rate.
Removing as many outliers as possible, the main constraint for parameters adjustment (e.g., number of nearest neighbors, filtering coefficients) was retainability of model's structure, or, in other words, presence of all significant walls in the model after outlier removal.
They found high cost of labour and other inputs, unavailability of demanded packages and untimely delivery as the main constraints to fertilizer adoption.
Nikoofarid and Aalaei (2012) designed a mathematical model for production planning in a dynamic virtual cellular manufacturing (DVCM) considering demand and part mix variation, machine capacity and as machine and worker availability as the main constraints.
In this review, we discuss several strategies for the incorporation of active molecules containing humic substances into granules of NPK compound fertilizers as well as the main constraints that have to be considered in this process, which normally depend on the agronomical results intended with the preparation of special humic-containing NPK compound fertilizers.
