To reduce the investment budget for an NPK blending fertilizer production line, it is essential to streamline equipment configurations, optimize processes, and strictly control redundant expenditures—all while ensuring production quality and compliance with national standards—thereby achieving low-cost, high-efficiency production.

Priority should be given to simplifying core processes and eliminating non-essential stages. Since blended fertilizers are produced via physical mixing, there is no need for ancillary equipment such as granulators, dryers, coolers, or coating machines; by directly eliminating these redundant stages, NPK blending machine and civil engineering costs for the NPK blended fertilizer line can be reduced by over 40%, while simultaneously lowering subsequent energy consumption costs. Equipment selection should adhere to the principle of "sufficiency is key"; for small-to-medium output production lines, a single-scale static batching system should be chosen to replace costly multi-scale dynamic batching systems. This approach ensures batching accuracy while significantly reducing investment in automation and control equipment.

Storage and ancillary facilities should also be streamlined. Modular, simple silos or brick-and-concrete bins should be utilized to replace large, all-steel storage silos, thereby reducing steel and civil engineering costs. For material transport, belt conveyors should be prioritized over high-cost bucket elevators; furthermore, in environments with low dust levels, small-scale dust collection units need only be installed at specific batching and packaging points, eliminating the need for a fully enclosed, plant-wide dust extraction system.

The packaging stage can be moderately simplified; initially, a semi-automatic packaging scale combined with manual palletizing assistance is sufficient, obviating the need to immediately invest in fully automatic palletizers or robotic loading equipment, thereby reducing automation-related capital expenditure. For the electrical control system, a basic PLC-based centralized control scheme should be selected, foregoing high-end features such as remote monitoring and big data management to further reduce automation and control costs.

Additionally, adopting a phased construction approach—where the core production line (batching, mixing, and packaging) is built first, and ancillary equipment is added later based on actual capacity requirements—helps alleviate the pressure of a large, upfront capital outlay. Through these measures, the overall investment can be effectively reduced while ensuring the stable operation of the production line, thereby achieving low-cost production and operational efficiency.