Fertilizer Reduction Combined with Organic Liquid Fertilizer Improved Canopy Structure and Function and Increased Cotton Yield

The application of organic liquid fertilizer combined with chemical is one the key technologies used to simultaneously improve cotton yield and efficiently utilize resources. However, usually applied once as a base during production, few studies have been conducted on topdressing water growth period. Therefore, in this study, Xinluzao 74 was experimental material, single (CF) control 2019–2020 under conditions integrated mulch drip irrigation. Five combinations reduction (OF1, OF2, OF3, OF4, OF5) were investigate influences leaf area index (LAI), canopy openness (DIFN), mean foliage tilt angle (MTA), photosynthetically active radiation (PAR), apparent photosynthesis (CAP), quality cotton. results show that among different fertilization treatments, OF2 treatment had best results, not only ensuring suitable LAI (4.8) maintaining large DIFN (0.1) but also increasing light transmittance middle lower canopies (0.02–0.03). At same time, CAP increased significantly compared CF treatment, an average increase 12.8%. high value lasted for long late decay stage remained at 8.9 μmol m−2 s−1. ratio population respiration rate total (CR/TCAP) decreased significantly, decrease 13.5%. Compared CF, lint by 27.0% other treatments. correlation analysis showed positively correlated relative chlorophyll content (SPAD value), PAR (PARU) upper (p < 0.05) negatively (PARM) (PARD) CR/TCAP 0.05). irrigation, (OF + 80% CF) improved structure stage, photosynthetic rate, significantly; thus, approach can be effective method achieve goal decreasing costs efficiency production.