Mineral fertilizer percentages can obscure the complete nitrogen input and the destination of nitrogen acquired by greenhouse tomato. This study asks how organic input accounting, fruit allocation, and recovery definitions alter interpretation of higher mineral nitrogen rates. We have used numerical measurements from a 2019–2020 Shouguang cultivation record were organized into six treatment-level records, retaining a separate isotope experiment. Calculations combined mineral and organic additions, separated fruit from non-fruit nitrogen, propagated printed-number rounding, and examined alternative input descriptions. Every treatment received 285 kg organic N ha−1. Under the nominal dose convention, N100 to N60 reduced mineral input by 40.00% but total fertilizer input by 13.66%. In the opposite comparison, 59.14 kg more mineral N ha−1 accompanied only 10.6 kg ha−1 more crop nitrogen: non-fruit nitrogen was 27.4 greater while fruit nitrogen was 16.8 smaller. N60 and N80 apparent-recovery intervals overlapped, and alternative printed doses reversed their central ordering. Terminal isotope recoveries summed to approximately 27.6%, leaving 72.4% unassigned outside the two reported crop compartments. The higher mineral inputs were associated mainly with additional non-fruit nitrogen rather than greater fruit nitrogen. These arithmetic findings are specific to the available cultivation record and do not establish yield equivalence, an economic optimum, environmental loss, or a fertilizer-timing prescription.
