Mineral nutrition and fertilization of sweet potato

Fernandes, Adalton Mazetti; Ribeiro, Nathalia Pereira

doi:10.15361/1984-5529.2020v48n4p325-338

Cited by 6 publications

(13 citation statements)

References 37 publications

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“…Sweetpotatoes take up high amounts of K (Fernandes & Ribeiro, 2020; Fernandes et al., 2020), which is essential for proper nourishment and root yield. In this study, plants grown in soils with low and medium exchangeable K and without K fertilization showed deficient K concentrations in the leaves (<31 g kg −1 ; Lorenzi et al., 1997), which did not occur in soil with initial high exchangeable K, demonstrating that K already available in the soil must be considered in the recommendation of K fertilization for sweetpotatoes.…”

Section: Discussionmentioning

confidence: 99%

“…is the sixth most important food crop in the world, after rice, wheat, potato, maize, and cassava (CIP, 2022). This root crop can be grown in soils with low nutrient availability (Byju & George, 2005; Fernandes & Ribeiro, 2020; Silva et al., 2002; Uwah et al., 2013); however, sweetpotato has high potassium (K) requirements for optimal root production (Gao et al., 2021; Wang et al., 2017). Potassium plays a vital role in sweetpotato storage root yield and quality (El‐Baky et al., 2010; Wang et al., 2017) because it is a constituent of numerous enzymes involved in photosynthesis (Marschner, 2012; Taiz et al., 2017), as well as in the transport of carbohydrates from the leaves to storage roots (Lebot, 2009; Römheld & Kirkby, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Potassium plays a vital role in sweetpotato storage root yield and quality (El‐Baky et al., 2010; Wang et al., 2017) because it is a constituent of numerous enzymes involved in photosynthesis (Marschner, 2012; Taiz et al., 2017), as well as in the transport of carbohydrates from the leaves to storage roots (Lebot, 2009; Römheld & Kirkby, 2010). To produce 1 Mg of storage roots, sweetpotato plants take up 6.9 kg of K, out of which 4.1 kg is taken up by the harvested storage roots (Fernandes & Ribeiro, 2020). However, fertilization estimates based on the K requirement per ton of storage roots produced may not be valid because when crops are grown in soil with an abundant K supply, luxurious consumption of K in plant tissues may occur; when the levels of soil–plant‐available K are very low, the estimated K rate may be too low to obtain maximum crop response (Brouder et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, most Brazilian guidelines recommend the application of K fertilizer only at the planting stage (Casali, 1999; Lorenzi et al., 1997), whereas others suggest splitting it between planting and topdressing application phases 1–1.5 months after planting (MP) (Echer et al., 2015; Silva et al., 2002). However, the period with the highest demand for K for sweetpotatoes starts after 1.5 MP, reaching a peak of maximum K uptake after 4 MP (Byju & George, 2005; Echer et al., 2009b; Fernandes & Ribeiro, 2020). Therefore, topdressing K application could be an alternative to reduce K losses and increase sweetpotato yield.…”

Section: Introductionmentioning

confidence: 99%

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Sweetpotato responses to potassium rate and timing in tropical sandy soils

et al. 2023

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sweetpotato responses to potassium rate and timing in tropical sandy soils

et al. 2023

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“…rotations under no‐tillage system reported 15–35 kg ha −1 yr −1 of N leaching, even in treatments without N fertilization (Rosolem, Castoldi, Pivetta, & Ochsner, 2018). These findings suggest that the 282 mm of rainfall that occurred from planting to hilling in SY 1 may have leached a great portion of starter N applied into the furrow, below seed tuber, once the root system of potato in this period of the cycle was still very shallow (Fernandes & Soratto, 2012; Rosen, Gupta, & Souza, 2020; Zotarelli et al., 2014). In addition, lower solar radiation and temperatures through the potato growing season in SY 1, compared to the other SYs, may have reduced crop evapotranspiration of the crop, and hence compromised its N uptake and growth (Lizana et al., 2020; Schulz et al., 2019; Zotarelli et al., 2014).…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll meter‐based leaf nitrogen status to manage nitrogen in tropical potato production

et al. 2021

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Potato (Solanum tuberosum L.) is a N intensive crop, and meeting its requirements with N fertilization is the primary practice to improve N recovery and achieve suitable tuber yield. A 3-site-year (SY) study was conducted to assess soil plant analysis development (SPAD)-502 chlorophyll meter efficacy for providing potato leaf real-time N status to adjust N timing and rate using nitrogen sufficiency index (NSI) thresholds of 90 or 95%. We evaluated effects of in-season SPAD-based N managements, as well as a reference with non-limiting N application, a fixed-timing (planting and hilling) conventional N fertilization, and a zero-N control on crop N uptake, tuber yield, and N-use efficiency of potato cultivar Agata grown in tropical clay soils. Tuber yields were similar in both SPAD-based managements. Under no intensive rainfall events after N applications, SPAD-based managements reduced N applications by 38-63% and resulted in comparable tuber set, bulking, and yield relative to conventional N fertilization. Additionally, SPAD-based management at a NSI threshold of 90% resulted in greater potato N-uptake efficiency and tuber yield per unit of N applied. SPAD-502 sensor was efficient for detecting plant N status when environmental conditions were more conducive for potato production and optimized N management by reducing application rates. However, with less favorable temperature and solar radiation for potato cultivation, and with intensive rainfall events following N application, SPAD readings did not guide to a proper N fertilization and resulted in reduced tuber yield. Therefore, under such conditions, a more accurate method for detecting plant N status should be used.

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