Root distribution and influencing factors of dry-sowing and wet-growing cotton plants under different water conditions
DING Yu,ZHANG Jianghui,BAI Yungang,LIU Hongbo,ZHENG Ming,ZHAO Jinghua%XIAO Jun
College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; Xinjiang Academy of Water Resources and Hydropower Sciences, Urumqi, Xinjiang 830049, China
摘要 To study the effect of soil water and salt environment factors on the root growth of cotton under different moisture control, three different emergence water volumes(60, 105, and 150 m3/hm2), two different frequencies(high frequency and low frequency)and one double film cover winter irrigation control treatment(CK: 2 250 m3/hm2)were set up to analyze the spatial distribution patterns of soil water and salt environment and root density in dry sown and wet emerged cotton fields under diffe-rent moisture control conditions. The results show that the soil water content and water infiltration range gradually become larger with the increase of seedling water quantity, and the larger the seedling water quantity, the higher the soil water content; with the same seedling water quantity, the soil water content of the high-frequency(HF)treatment becomes obviously larger. The soil conductivity of each treatment tends to decrease gradually with the increase of seedling water and drip frequency, among which the distribution of soil conductivity of S6 treatment is closest to that of CK; with the increase in soil depth, the soil conductivity tends to increase first and then decrease and compared with the low-frequency(LF)treatment, the high-frequency treatment shows a significantly deeper soil salt accumulation layer. The root length density(RLD)of cotton gradually increases with the amount of seedling water and the frequency of dripping; the soil layer of root distribution gradually deepens with the amount of seedling water in the vertical direction, and the RLD value in the horizontal direction is significantly greater in the mulched area than in the bare area between films. This research can serve as a solid scientific foundation for the use of dry sowing and wet emergence techniques in cotton fields in southern Xinjiang.
DING Yu,ZHANG Jianghui,BAI Yungang,LIU Hongbo,ZHENG Ming,ZHAO Jinghua%XIAO Jun. Root distribution and influencing factors of dry-sowing and wet-growing cotton plants under different water conditions[J]. 排灌机械工程学报, 2023, 41(10): 1073-1080.
