%A Xian-Qing HOU,You-Wen NIU,Wen-Li WU,Jin-Peng XU,Long SHI,Shao-Ying TANG,Xu MA,Rong LI %T Effect of Planting Density on the Growth, Water Use Efficiency and Yield of Dry-farming Potato under Different Rainfall Year Types %0 Journal Article %D 2018 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2018.01560 %P 1560-1569 %V 44 %N 10 %U {https://zwxb.chinacrops.org/CN/abstract/article_6565.shtml} %8 2018-10-10 %X

In order to explore the reasonable planting density of potato under plastic film mulching and ridge planting, a 2-year field experiment was conducted in semi-arid areas liable to droughts of southern Ningxia between 2015 and 2016, with five planting density treatments, including 37 500 (A), 45 000 (B), 52 500 (C), 60 000 (D), and 67 500 plant ha -1 (E). Local traditional planting density of 37 500 plant ha -1 (A) was as the control. Different planting densities could significantly influence the water status of soil layer at 0-100 cm during the earlier and middle stages of potato growth. The soil water storages in treatments B and C were the highest, which were significantly higher than those in treatments A and E. The treatments B and C could significantly increase emergence rate of potato, and promote the growth of potato during the early stage and middle stage compared with other treatments, whereas there were no significant differences among the five treatments during the later stage of potato growth. The tuber yield and commodity rate of potato increased at first and then decreased with increasing planting density. Compared with treatment A, the 2-year mean rainfall use efficiency of treatments B and C were significantly increased by 15.3% and 17.6%, and mean water use efficiency were significantly increased by 11.1% and 15.0%, respectively. By function fitting with the two-year data, the highest tuber yield and water use efficiency of dry-farming potato under plastic film mulching and ridge planting was demonstrated in normal year and dry year in semi-arid areas liable to droughts of southern Ningxia, which was 51 187-51 302 plant ha -1.