%A SHI Yan-Yan, MA Zhi-Hua, WU Chun-Hua, ZHOU Yong-Jin, LI Rong %T Effects of ridge tillage with film mulching in furrow on photosynthetic characteristics of potato and yield formation in dryland farming %0 Journal Article %D 2022 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2022.14050 %P 1288-1297 %V 48 %N 5 %U {https://zwxb.chinacrops.org/CN/abstract/article_7335.shtml} %8 2022-05-12 %X

To investigate the effects of ridge tillage with film mulching in furrow on photosynthetic characteristics and yield formation of potato in dry land, field experiment was conducted from 2018 to 2019 in mountain area of south Ningxia. Ridges were covered with common plastic film in all treatments, while different furrow treatments were mulched with common plastic film (DD), degradable permeable mulch film (DS), and bast fiber film (DM), and no mulching furrows was used as the control check (CK). The effects of ridge tillage with film mulching in furrow on soil moisture, photosynthetic characteristics of potato functional leaves and yield formation during the key growth period (60-120 days after sowing) were investigated and compared. The results showed that the different mulching treatments could significantly increase soil water storage in 0-100 cm layer during potato squaring stage (60 days after sowing). DD treatment was the highest in 2018 and DM treatment was the highest in 2019, which significantly increased by 11.2% and 21.6% than CK, respectively. In the key growth periods of potato, leaf area index of DS treatment was significantly higher than that of CK in 2019, but there was no significant difference among the other treatments. Different mulching treatments could increase the net photosynthetic rate and transpiration rate, while DM treatment significantly increased the net photosynthetic rate and transpiration rate by 30.0% and 23.2% in the tuber swelling stage (120 days after sowing), compared with CK, respectively. The average tuber dry matter accumulation with DD, DM and DS treatments in the 2-year tuber swelling stage was significantly increased by 54.9%, 50.0%, and 22.6%. During the 2-year experiments, the average potato yield with DD, DM and DS treatments was increased by 13.2%, 14.1%, and 5.2%, the average net income was increased by 16.3%, 14.6% and 4.0%, respectively, compared with CK, while the differences in potato yield and net income were not significant between DS and CK. Correlation analysis showed that soil moisture and net photosynthetic rate were the main factors affecting potato yield formation. The treatments of ridge tillage with common plastic film mulching in furrow (DD) and ridge tillage with bast fiber film mulching in furrow (DM) could improve soil moisture at squaring stage, thus promoting the increase of potato photosynthesis and yield. Therefore, ridge tillage with bast fiber film mulching in furrow had the same effect of increasing yield and income as ridge tillage with common plastic film mulching in furrow, and it had the advantage of partially replacing common plastic mulching.