PDF(Pubmed)
Abstract：
Sufficient soil moisture is required to ensure the successful transplantation of sweet potato seedlings. Thus, reasonable water management is essential for achieving high quality and yield in sweet potato production. We conducted field experiments in northern China, planted on 18 May and harvested on 18 October 2021, at the Nancun Experimental Base of Qingdao Agricultural University. Three water management treatments were tested for sweet potato seedlings after transplanting: hole irrigation (W1), optimized drip irrigation (W2), and traditional drip irrigation (W3). The variation characteristics of soil volumetric water content, soil temperature, and soil CO2 concentration in the root zone were monitored in situ for 0-50 days. The agronomy, root morphology, photosynthetic parameters, 13C accumulation, yield, and yield components of sweet potato were determined. The results showed that soil VWC was maintained at 22-25% and 27-32% in the hole irrigation and combined drip irrigation treatments, respectively, from 0 to 30 days after transplanting. However, there was no significant difference between the traditional (W3) and optimized (W2) drip irrigation systems. From 30 to 50 days after transplanting, the VWC decreased significantly in all treatments, with significant differences among all treatments. Soil CO2 concentrations were positively correlated with VWC from 0 to 30 days after transplanting but gradually increased from 30 to 50 days, with significant differences among treatments. Soil temperature varied with fluctuations in air temperature, with no significant differences among treatments. Sweet potato survival rates were significantly lower in the hole irrigation treatments than in the drip irrigation treatments, with no significant difference between W2 and W3. The aboveground biomass, photosynthetic parameters, and leaf area index were significantly higher under drip irrigation than under hole irrigation, and values were higher in W3 than in W2. However, the total root length, root volume, and 13C partitioning rate were higher in W2 than in W3. These findings suggest that excessive drip irrigation can lead to an imbalance in sweet potato reservoir sources. Compared with W1, the W2 and W3 treatments exhibited significant yield increases of 42.98% and 36.49%, respectively. The W2 treatment had the lowest sweet potato deformity rate.
摘要：
需要足够的土壤水分以确保甘薯幼苗的成功移植。因此，合理的水分管理对于实现甘薯生产的优质高产至关重要。我们在中国北方进行了现场实验,5月18日在青岛农业大学南村实验基地种植，2021年10月18日收获。对甘薯移栽后的幼苗进行了三种水分管理处理：孔灌（W1），优化滴灌(W2)，和传统滴灌（W3）。土壤体积含水量的变化特征,土壤温度,对根区土壤CO2浓度进行了0-50天的原位监测。农学，根形态,光合参数，13C积累，产量，并对甘薯的产量构成因素进行了测定。结果表明,孔灌和联合滴灌处理土壤VWC保持在22-25%和27-32%,分别,移植后0至30天。然而,传统（W3）和优化（W2）滴灌系统之间没有显着差异。移植后30到50天，VWC在所有治疗中均显著下降，所有治疗方法之间存在显著差异。移栽后0～30天土壤CO2浓度与VWC呈正相关,30～50天逐渐升高。处理间有显著差异。土壤温度随气温波动而变化，处理间无显著差异。灌孔处理甘薯成活率明显低于滴灌处理,W2和W3之间无显著差异。地上生物量，光合参数，滴灌条件下叶面积指数显著高于灌孔条件下,W3中的值高于W2中的值。然而,总根长度，根体积,W2和13C分配率高于W3。这些发现表明，过度滴灌会导致甘薯储层来源失衡。与W1相比，W2和W3处理的产量显着提高了42.98％和36.49％，分别。W2处理的甘薯畸形率最低。
