Agricultural Science <p><em>Agricultural Science</em>&nbsp;(ISSN 2690-5396 e-ISSN 2690-4799) is an international, double-blind peer-reviewed, open-access journal, published by the IDEAS SPREAD&nbsp;in United States. It publishes original research, applied, and educational articles in all areas of agricultural science.&nbsp;<br> <em>Agricultural Science</em> is striving to provide the best platform for researchers and scholars worldwide to exchange their latest findings. Authors are encouraged to submit complete, unpublished, original works that are not under review in any other journals. The journal is published in both print and online versions, and the online version is available for free.</p> IDEAS SPREAD INC en-US Agricultural Science 2690-5396 <p>Copyright for this article is retained by the author(s), with first publication rights granted to the journal.<br>This is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (</p> Effects of Different Soil Moisture Contents on Photosynthesis of Lettuce <p>In order to explore the photosynthetic physiological response characteristics of lettuce under different soil moisture conditions, the photosynthetic indexes and chlorophyll fluorescence parameters of lettuce under different soil moisture gradients were determined by pot water control experiment. The results showed that with the decrease of soil moisture content, Pn, Tr, Gs, Ci, Fv/Fm, Ī¦PSII and qP of lettuce leaves all showed a downward trend, while NPQ increased with the decrease of soil moisture content. Among them, the water holding capacity in the field was 55~60%, and the net photosynthetic rate of lettuce was the highest, indicating that mild drought promoted photosynthesis of lettuce.</p> Xiao Kong Zhen Liu Weiguo Fu ##submission.copyrightStatement## 2023-07-22 2023-07-22 5 2 p1 p1 10.30560/as.v5n2p1