Effects of Various Potassium Fertilizer Dosages on Agronomic and Economic Assessment of Sweet Potato Fields
Jibiao Geng,
Qichao Zhao,
Zeli Li,
Xiuyi Yang,
Shutong Lei,
Qingping Zhang,
Hui Li,
Ying Lang,
Xianqi Huo,
Qianjin Liu
Affiliations
Jibiao Geng
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Qichao Zhao
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Zeli Li
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Xiuyi Yang
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Shutong Lei
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Qingping Zhang
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Hui Li
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Ying Lang
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Xianqi Huo
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
Qianjin Liu
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science/Resources and Environment, Linyi University, Linyi 276000, China
To explore the effects of various potassium fertilizer dosages on sweet potatoes, field experiments were conducted in 2018 and 2019 using a randomized block design. In the experiment, the control (completely blank, no fertilizer), KS0 (potassium blank, no potassium fertilizer), KS100 (100 kg K2O ha−1), KS200 (200 K2O ha−1), and KS300 (300 K2O ha−1) treatments were set up. The application of potassium fertilizer increased the potassium content of sweet potato plants, thereby increasing the chlorophyll content, net photosynthetic rate, and the fluorescence chlorophyll parameters. It also increased the amylose content in tuber roots to increase the total starch content and yield of sweet potatoes. Specifically, the KS200 treatment significantly improved the soil potassium content, potassium absorption, potassium agronomic efficiency, and potassium recovery efficiency. Compared with the other treatments, the yield and net profit of the KS200 treatment increased by 0.89–27.05% and 2.34–30%, respectively, on average, over two years. Based on factors such as sweet potato yield and starch content, the recommended amount of potassium fertilizer was 200 kg ha−1, which has significant economic benefits and theoretical value.
