---
title: What does it mean if net Photosynthesis (Pn) is negative?
description: What does it mean if net Photosynthesis (Pn) is negative?
---

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# What does it mean if net Photosynthesis (Pn) is negative?

This indicates that the leaf you are sampling is not actively photosynthesizing or using CO2. The plant could be photosynthesizing at low rates or be in a state of respiration.

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