Sweetpotato responses to potassium rate and timing in tropical sandy soils

The response of sweetpotato [Ipomoea batatas (L.) Lam.] to potassium (K) can vary based on soil K availability and the rate and timing of K application. This study evaluated the effects of K application rate and timing on leaf K concentration and yield attributes of sweetpotatoes grown in tropical sandy soils with different K availabilities. Treatments had three rates (60, 120, and 240 kg ha(-1) K2O) and four timings (pl, the full rate at planting; pl-1.3, 1/2 rate at planting plus 1/2 at 1.3 months after planting [MP]; pl-3, 1/2 rate at planting plus 1/2 at 3 MP; pl-1.3-3, 1/3 rate at planting plus 1/3 each at 1.3 and 3 MP), including a control (without K application). The benefits of K timings and application rates on sweetpotato yield were greater in K-deficient soils with the maximum yield of sweetpotato (25.8-34.3 Mg ha(-1)) at the estimated rate of 153-179 kg ha(-1) K2O in three application times. In soil with medium exchangeable K, the maximum total root yield (28.5-34.2 Mg ha(-1)) occurred at an optimum estimated rate of 113-122 kg ha(-1) K2O. In soils with high exchangeable K, K application rates reduced the yield of roots or starch, and no K deficiency occurred in the unfertilized K treatments. To obtain high storage root and starch yields in sweetpotatoes grown in K-deficient tropical sandy soils, there should be three K applications, and K application rates should be based on K levels already available in the soil.

Automated summary

The response of sweetpotato to potassium can vary based on soil K availability and the rate and timing of K application. This study evaluated the effects of K application rate and timing on leaf K concentration and yield attributes of sweetpotatoes grown in tropical sandy soils with different K availabilities. Results showed that the benefits of K timings and application rates on sweetpotato yield were greater in K-deficient soils, and the optimal K application rates varied depending on soil K levels.