Crop Physiology of Sweetpotato

Ravi, V.; Indira, P.

doi:10.1002/9780470650752.ch6

Cited by 44 publications

(63 citation statements)

References 155 publications

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“…Villordon et al (2009b) concluded that most storage roots in both 'Georgia Jet' and 'Beauregard' were initiated in the first 5 to 35 days after planting. This may be because existing storage roots are strong sinks for photosynthates (Ravi and Indira 1999) and their presence may limit the initiation of additional storage roots late in the growing season.…”

Section: Discussionmentioning

confidence: 99%

“…Lowe and Wilson (1974) noted that most of the marketable storage roots are initiated during the first few weeks after planting. Ravi and Indira ( 1999) stated that water deficit soon after planting decreases the number of storage roots in sweet potato. Thus the dry period in June 2012 rather than the dry August may explain the lower number of storage roots we observed in 2012 compared to 2011 (Tables 4 and 5).…”

Section: Discussionmentioning

confidence: 99%

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Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters

Wees¹,

Séguin²,

Boisclair

2016

Can. J. Plant Sci.

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The sweet potato (Ipomoea batatas (L.) Lam.) requires a long, hot growing season to attain good yields. In a cool climate, the use of black plastic mulch to heat the soil can improve growth but cultivars, plant spacing, and harvest date must be carefully selected to optimize yields and to attain market quality standards. In this two-year study in Quebec, Canada, two sweet potato cultivars ('Georgia Jet' and 'Beauregard') were grown at four in-row spacings (15, 30, 45, and 60 cm) and harvested at three dates (mid September, late September, and early October). Cumulative growing degree-days (GDD) with base temperatures of 10°C and 15.5°C were calculated for each harvest date. 'Georgia Jet' had higher total and marketable yields than 'Beauregard'. In-row spacing had no effect on yields per hectare of 'Beauregard' and only affected 'Georgia Jet' in one year of the study. Average root weight of sweet potatoes, yields per plant, and number of roots per plant increased with wider spacing. Delaying harvest by one or two weeks had little effect on 'Beauregard' but increased yields of 'Georgia Jet'. GDD may be a useful predictor of optimum harvest date but a lower base temperature used to calculate GDD may be desirable with 'Georgia Jet' as its yields continued to increase even when growing under cool conditions of late September and early October.Key words: sweet potato, Ipomoea batatas, mulch, spacing, harvest date, degree-days.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters

Wees¹,

Séguin²,

Boisclair

2016

Can. J. Plant Sci.

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“…In other root crops, e.g. sweet potato (Ipomoea batatus L.), the ratio between storage root dry matter and the total dry matter is used to indicate dry matter partitioning efficiency to storage roots [23]. Further, in sweet potato partitioning efficiency can range from 11 to 85% depending on cultivar; in ginseng seedling used here it was high, ranging from 61 to 74%.…”

Section: Dry Matter Accumulationmentioning

confidence: 99%

Growth, Dry Matter Partitioning and Photosynthesis in North American Ginseng Seedlings

Proctor

Palmer²,

Follett³

2010

Journal of Ginseng Research

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“…The growth increased with increasing temperature up to 35°C, but the growth was strictly depressed when the temperature reached 38°C. Ravi & Indira (1999) confirmed that below 15°C, the storage root formation was supressed whereas air temperatures above 30°C increased indole acetic acid oxidase activity which caused reduction in storage root formation and growth. Villordon et al (2011;2010) emphasized that soil temperatures 30°C and greater in the upper 10 cm of the soil profile during the establishment and storage root initiation phases reduced adventitious root counts and storage root yields.…”

Section: Temperature Effectsupporting

confidence: 55%

“…The interaction among environmental and genetic factors influences leaf area and production, abscission, leaf photosynthesis, dry matter production and partitioning, storage root formation and development (Ravi & Indira 1999).…”

Section: Temperature Effectmentioning

confidence: 99%

Studies on propagation materials and growing conditions for sweetpotato [Ipomoea Batatas (L.) Lam] production

Atu¹

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A thesis submitted for the degree of Master of Philosophy atThe University of Queensland in 2013 School of Agriculture and Food Sciences i ABSTRACTSweetpotato propagation is cultivated through use of sprout (slip) or vine cutting. Production of sprout is increased by best selection of storage root sizes to optimize growth and yield.Cultivars of different storage root sizes produced variable numbers of sprouts, varying in length and thickness and to explore this four storage root sizes in an open field bed were trialed. Beauregard and Northern Star storage roots selected from the large, medium, smallmedium and small storage root category sown in bed and sprouts at three length classes were first measured 47 days after sowing. The next three harvests were measured at 21 days interval while the fifth harvest was at 44 days after the fourth, calculated from the Growing Degree Days (GDD) units. Beauregard produced significantly higher number of sprout at >20 cm but fewer > 35 cm length than Northern Star. The sprout length 20 -35 cm class increased for both varieties after Harvest 1 but Beauregard tended to increase less for this class than Northern Star with progressive harvests. In the fifth harvest 20 -35 cm length class for both varieties had reduced although Northern Star produced more for this class than Beauregard. A significantly higher number of sprouts were produced by large root but not significantly different from the medium root. Sprout categories for < 20 and 20 -35 cm were greater for large and medium roots than smaller roots. The thickness of sprout progressively decreased in numbers as storage roots size decreased. Sprouts longer than 20 cm are considered best propagation material for farmers and to achieve this within the best possible short period is an advantage to farmers.The experiment study on seven sweetpotato varieties for pathogen tested (PT) and nonpathogen tested (NPT) was investigated at 60 days after planting (DAP), 120 DAP and 220 DAP for yield differences. There was no significant difference (P < 0.05) for all varieties for early root growth at 60 (DAP). No significant difference was observed for PT and Non-PT for the marketable yield but a significant increase in non-marketable yield at 120 DAP and 220 DAP for PT and non-PT was presumably due to virus infection.The number of marketable storage root production declined as the crop grew older but the opposite trend occurred for the non-marketable yield which increased three fold in the final harvest compared to the previous harvest. Northern Star produced the highest number and weight of marketable and non-marketable roots compared to the other six varieties.ii LD02 and Beauregard were the second best varieties in terms of marketable roots while L49, Vekeoli and Lola Tonga had the least potential. Northern Star followed by Beauregard and LD02 proved their supremacy by their ability to partition dry matter to bulk storage root.Beauregard was the only variety observed with SPFMV infection in the foliage.High soil temperatures affected the...

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Crop Physiology of Sweetpotato

Cited by 44 publications

References 155 publications

Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters

Sweet potato production in a short-season area utilizing black plastic mulch: effects of cultivar, in-row plant spacing, and harvest date on yield parameters

Growth, Dry Matter Partitioning and Photosynthesis in North American Ginseng Seedlings

Studies on propagation materials and growing conditions for sweetpotato [Ipomoea Batatas (L.) Lam] production

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