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For high sweet potato yields, potassium management is key.

Release Date:

2021-10-13

In the second half of 2021, rainfall was significantly above average compared with previous years. Recently, areas east of the 400 mm precipitation contour have experienced widespread heavy precipitation, leading to flooding and waterlogging in some regions and severely impacting the maturation of autumn crops and the grain harvest.
At the end of September, after a week of continuous rain, we visited sweet potato fields in Sishui. We observed that sweet potatoes grown in different soil types exhibited varying performance. Let’s take a look at how sweet potatoes are faring under these diverse conditions:
Sweet potato application 10-8-24 Co-application Agricultural University No. 1 Top-Three Bio-Organic Fertilizer Compared with conventional 17-17-17 fertilizer, the aboveground parts showed superior growth, with large, deep‑green leaves, and the humic acid’s ability to retain nutrients and water was plainly visible. Soil moisture remained around 70%, which is typical for the sweet potato harvest period, supporting favorable growth; however, a small number of pests such as wireworms and grubs were observed in the field.
On August 6, 50 days after transplanting, both the standard NPK fertilizer (17-17-17) and the Nongda‑specific sweet potato potassium‑controlled fertilizer (10-8-24) had already closed the rows. The Nongda formulation showed no excessive vegetative growth, whereas the 17-17-17 treatment exhibited pronounced nitrogen‑induced overgrowth, which hindered tuber formation and resulted in a reduced number of marketable tubers.
Observation 50 days after transplanting on August 6.
On September 29, after 103 days since transplanting, the plants fertilized with a standard 17-17-17 formula showed signs of nutrient deficiency, with yellowing and weak foliage. In contrast, those treated with Nongda’s potassium‑controlled sweet potato fertilizer (10-8-24) maintained large, dark green leaves, providing crucial support for tuber enlargement and yield formation.
Observation 103 days after transplanting on September 29.
On September 29, after 103 days since transplanting and with conventional fertilization, the plants produced only 3–4 tubers, which were poorly shaped and had dull, lackluster skin. In contrast, the Nongda‑fertilized sweet potato variety with a controlled potassium ratio of 10‑8‑24 yielded 6–8 tubers per plant, uniformly sized, and exhibited vigorous growth.
Due to prolonged rainfall, the soil is heavy and poorly drained, with soil moisture exceeding 80%. This has created favorable conditions for the proliferation of water‑logging–associated pathogens and pests, resulting in weakened growth under stress. The surfaces of diseased sweet potatoes are heavily coated with soil, making it difficult to discern lesions. After washing, symptoms such as black spot, cracking, and numerous rough, mottled spots caused by mixed fungal infections—common this year across the country under hot, humid conditions—were observed.
In addition, improper application of base fertilizer, coupled with vigorous vegetative growth and severe pest, disease, and weed pressure, negatively impacts sweet potato yields. Under identical management conditions, the Nongda‑fertilized sweet potatoes—formulated as 10‑8‑24S—exhibit uniform tuber formation, a glossy skin, and markedly superior fertilizer efficacy.
In recent years, sweet potatoes have demonstrated high economic value and are widely utilized. Sweet potato potassium-control fertilizer 10-8-24 It can significantly increase the number of tubers, yield, and quality of sweet potatoes, thereby greatly enhancing economic returns. A single fertilization practice can transform how a crop is perceived by consumers.

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