Transparent and Black Film Mulching Improve Photosynthesis and Yield of Summer Maize in North China Plain

In order to clarify the influences of drip irrigation under different mulch materials on crop yield, field experiments were carried out in North China Plain for two seasons 2020 and 2021. The changes microenvironment, photosynthetic capacity, leaf biological factors, maize growth indexes analyzed with transparent film (W), black (B), straw mulching (S), a nonmulching as control (CK). results showed that compared CK, yield W B increased by 7.2–9.9% 7.1–12.4%, S did not change significantly. increase was related improvement microenvironment capacity higher LAI. Compared soil water content 0–40 cm below surface W, B, 13.6%, 9.1%, 4.6%, respectively, 5 effective accumulated temperature 7.9–10.2% 4.1–4.7%, respectively. maximum carboxylation rate (Vmax) at jointing stage significantly 3.5–17.3%, 12.7–17.6%, 10.1–12.7% CK. There significant linear correlation between Vmax Nmass, affected treatments. At stage, LAI 8.6–66.5% 7.2–56.0%, but there no difference conclusion, resulted from combined effect increasing LAI, Vmax, temperature.