Sweet potato yield in response to different potassium sources and splitting of fertilization

Silva, Luiz Daniel Rodrigues da; Cruz, João Carlos Ribeiro; Sousa, Valéria Fernandes de Oliveira; Silva, Adjair José da; Silva, Mylena C. da

doi:10.1590/1807-1929/agriambi.v26n7p527-532

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…In our study, root yield did not decrease at K levels above 180 kg ha root yield achieved with 270K+41Skg ha -1 (F3:0Mg:S2) (Table 8) suggests that there was a sulfur deficiency. Potassium applied as KCl or K 2 SO 4 can generate distinct responses in root production owing to their accompanying anions [40], and that K 2 SO 4 is more efficient in favoring the formation and redistribution of carbohydrates. The results of our study agree with findings of [41], reporting that KC1 + S and K 2 SO 4 produced the same cassava yields when the soil available S was adequate, and this was mainly attributed to the sulfur.…”

Section: Discussionmentioning

confidence: 99%

Uncovering the Interaction between Potassium, Magnesium and Sulfur on Cassava Growth and Root Yield

Alame¹,

Enesi²,

Too³

et al. 2022

ABR

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Cassava is an important staple crop in sub-Saharan Africa, yet root yields are low and a wide range of yield limiting factors causes a large yield gap. Next to pests and diseases, nutrient deficiencies and imbalances are likely contributors to low yields. Cassava has a high potassium (K) demand, yet previous research shows that K application does not generally lead to increased yields. Potassium may have antagonistic effects on magnesium (Mg) and cause relative deficiency of Mg. The objective of this study was to determine if interactions between K and Mg affect growth and root yield of cassava. A randomized complete block design with three replicates was used in a 18 × 2 factorial arrangement. Eighteen fertilizer treatments with 4 levels of K (0,90,180 and 270 kg ha -1 ), 3 levels of Mg (0,15.5 and 31 kg ha -1 ) were combined with exclusion of Mg treatments but addition of sulfur (S), to account for the S in the Mg source Kieserite, at 2 levels of S (20.5 and 41 kg ha -1 ), yet excluding Mg. The cassava varieties TME419 and TMS581 were used. Stem height, stem mass and total aboveground mass, storage root yield and starch content were evaluated. Stem height, fresh stem yield and fresh total above ground yield significantly increased with the application of K, K+Mg and K+S, compared with treatments not receiving K, emphasizing the importance of K and indicating that Mg is less important for shoot growth. Fresh and dry matter storage root yield did not respond to K application above 180 kg ha -1 as KCl. The application of 270 kg ha -1 K with 41kg ha -1 S attained the highest fresh and dry matter storage root yield, indicating that the lack of S had a stronger yield limiting effect than Mg availability. Starch content was highest (19.7%) with application of 0K:31Mg:41S (kg/ha) highlighting the role of Mg and S in the synthesis and accumulation of starch in the roots. Thus, it appears that at high K application levels, K 2 SO 4 is the better source of K especially in S deficient soils.

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Section: Discussionmentioning

confidence: 99%

Uncovering the Interaction between Potassium, Magnesium and Sulfur on Cassava Growth and Root Yield

Alame¹,

Enesi²,

Too³

et al. 2022

ABR

View full text Add to dashboard Cite

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Sweet Potato (Ipomoea batatas L.) Response to Incremental Application Rates of Potassium Fertilizer in Mississippi

et al. 2022

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Potassium (K) fertilization is a crucial component of sweet potato (Ipomoea batatas L.) production. The basis for K fertilizer recommendations in sweet potato production varies greatly and relies on studies conducted in the late 1950s–1970s. Changes in agronomic practices and increasing costs emphasize the need to revisit fertilizer recommendations. A field experiment was conducted to investigate the impact of seven different K fertilizer (K2O) application rates on sweet potato storage root yield, tissue K concentration, and economic implications in Mississippi. Incremental applications of K fertilizer did not influence sweet potato yield at any grade. Leaf tissue K concentration exhibited a quadratic trend in response to K fertilizer rate, with maximum leaf and root K content achieved at 269 and 404 kg·ha−1 K2O, respectively. Both the predicted K application rate for maximum yield and maximum profitability were the same, at 174 kg·ha−1 K2O. Accordingly, comparable sweet potato yields were achieved while applying substantially less fertilizer than the recommended rate. Further research is warranted to examine the impacts of only potassium fertilizer applications on soil characteristics and temporal trends in sweet potato potassium uptake, as well as refine fertilization recommendations for sweet potato production.

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Effect of Fertilization Level on the Yield, Carotenoids, and Phenolic Content of Orange- and Purple-Fleshed Sweet Potato

et al. 2023

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Maintaining a diverse diet is essential for the preservation of one’s health and may contribute to the fight against significant civilization diseases such as obesity or diabetes. Sweet potato can be fitted into a diverse diet and serve as a functional food with its antioxidant content. Therefore, it is important to know how the production technology alters the content and composition of these antioxidant compounds. The objective of this study was to collect information on how the increased potassium dominant fertilizer levels and also the additional high-dose fertigation can affect the phytonutrient contents and yields in an orange- and a purple-fleshed sweet potato cultivar. Field experiments were conducted in the Hungarian county of Heves in two consecutive growing seasons in 2021–2022. Different doses of potassium-predominant fertilizer were applied to an orange flesh (Beauregard) and a purple flesh (Stokes Purple) varieties of sweet potatoes. Different application techniques were used in the form of base and top dressing at different rates. The effect on yield and polyphenol content of the different fertilizer rates was investigated. Analytical studies were carried out by high-performance liquid chromatography (HPLC). In the case of the Beauregard variety, in addition to identifying the carotenoids, we also performed their quantitative determination. We found that 87% of the carotenoid content was ß-carotene. The total anthocyanin content was investigated for the purple variety—Stokes Purple, for which a new extraction method was developed. In our study, the split dosages, when the pre-planting fertilizer was supplemented with additional liquid fertilization, resulted in 36 and 30.5% higher yields in the Beauregard in Experiment I and Experiment II, respectively, compared to the untreated control plots over the two years. The additional liquid fertilizer increased the yield to a lesser extent when compared to treatments received only pre-planting fertilizer. As for Experiment III, the split dosages resulted in 34.4% higher yields in the Stokes Purple compared to the control plots. However, the additional liquid fertilizer was not effective at all when the plants received a double dose of pre-planting fertilizer in the case of Stokes Purple. Total carotenoid (Experiment I–II) was higher and anthocyanin yield per plant (Experiment III) was significantly higher in the split-dosage treatment than in the untreated control plots.

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Sweet potato yield in response to different potassium sources and splitting of fertilization

Cited by 3 publications

References 19 publications

Uncovering the Interaction between Potassium, Magnesium and Sulfur on Cassava Growth and Root Yield

Uncovering the Interaction between Potassium, Magnesium and Sulfur on Cassava Growth and Root Yield

Sweet Potato (Ipomoea batatas L.) Response to Incremental Application Rates of Potassium Fertilizer in Mississippi

Effect of Fertilization Level on the Yield, Carotenoids, and Phenolic Content of Orange- and Purple-Fleshed Sweet Potato

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