Yield and Yield Components of Six Sweet Potato (Ipomoea batatas) Cultivars II. Variability and Possible Sources of Variation

1975 ◽  
Vol 11 (1) ◽  
pp. 49-58 ◽  
Author(s):  
S. B. Lowe ◽  
L. A. Wilson
Keyword(s):  
Sweet Potato ◽  
Yield Components ◽  
Ipomoea Batatas ◽  
Total Yield ◽  
Yield Variability ◽  
Tuber Development ◽  
Marketable Yield ◽  
Yield Variation ◽  
Planting Material ◽  
Sources Of Variation

SUMMARYVariabilities in total yield, marketable yield and components of yield (tuber numbers and mean tuber weights) were studied in six sweet potato cultivars over two seasons, in crops harvested at two dates. Yield variability was high, particularly in marketable tubers, and was related to either or both components of yield. High-yielding cultivars had lower variabilities and the commercial cultivar 049 the lowest. The contribution of yield components to variability in total yield was evaluated and sources of yield variation were attributed to planting material, tuber development and season.

Yield and Yield Components of Six Sweet Potato (Ipomoea batatas) Cultivars I. Contribution of Yield Components to Tuber Yield

1975 ◽  
Vol 11 (1) ◽  
pp. 39-48 ◽  
Author(s):  
S. B. Lowe ◽  
L. A. Wilson
Keyword(s):  
Sweet Potato ◽  
Yield Components ◽  
Ipomoea Batatas ◽  
Tuber Yield ◽  
Total Yield ◽  
Tuber Number ◽  
Tuber Weight ◽  
Marketable Yield ◽  
Yield And Yield Components ◽  
Positive Correlations

SUMMARYTotal yield and yield components (tuber numbers and mean tuber weights) of six local sweet potato cultivars were compared in wet and dry season crops. There were significant negative correlations between tuber number and mean tuber weight in five of the six cultivars, and positive correlations between these yield components and total yield, suggesting that cultivars may be grouped into ‘tuber number-tuber weight’ and ‘tuber weight’ types, as well as a ‘random type’ in which yield is related to neither component. Marketable yield tended to be directly related to both components, and cultivars with lower tuber numbers usually produced a higher percentage of marketable yields. The significance of these findings for sweet potato yield improvement is discussed.

scholarly journals Evaluation of yield and nitrogen utilisation with urease and nitrification inhibitors in sweet potato crop (Ipomoea batatas L.)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ioanna Kakabouki ◽  
Triantafyllos Togias ◽  
Antigoni Eleni Folina ◽  
Stella Karydogianni ◽  
Charikleia Zisi ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Yield Components ◽  
Ipomoea Batatas ◽  
Field Experiments ◽  
Block Design ◽  
Nitrification Inhibitor ◽  
Nitrification Inhibitors ◽  
Marketable Yield ◽  
Area Index ◽  
Positive Correlation

AbstractSweet potato (Ipomoea batatas L.) is a new tuber crop grown in Greece. It constitutes an innovative dietary component for both humans and animals, due to its nutritional properties. The cultivation of sweet potato focuses on the growth of both tubers and plants. Nitrogen is considered an essential element for almost all crops. This study set out to compare the effect of nitrogen inhibitors on yield components of sweet potato. In the literature, it is stated that in sweet potato cultivation nitrogen mainly affects the plants’ growth such as the tuber's yield and some quality characteristics such as dry matter and protein content. To furthermore explore this particular area, field experiments took place in West Greece, during the years 2018 and 2019. Several urea combination treatments were used in the experimental process. The treatments were urea (46-0-0), urea with urease inhibitor (UI), urea with nitrification inhibitor (NI), urea with double inhibitors (UI + NI) and control (without fertilizer) in a randomised complete block design. Leaf area index (LAI) was significantly affected by the fertilizer marking the highest value of 5.35 under urea + UI + NI treatment. Marketable yield was profoundly affected by the fertilizer in the experimental years and ranged from 18,180 to 23,230 Kg · ha−1 whereas non-marketable yield was not affected by the fertilizer. A considerable impact of fertilizers was noticed on yield where the highest value was 30,923 Kg · ha−1 under urea + NI + UI treatment. The percentage of nitrogen on tubers and upper parts was significantly affected by the fertilizers. Nitrogen markers, such as nitrogen use efficiency (NUE), nitrogen harvest index and nitrogen agronomic efficiency (NAE), were used to evaluate nitrogen release. A significant positive correlation was noticed between marketable yield and NUE (0.774). Also, the significant increase in yield showed a positive correlation with NAE (0.727). For yield components of sweet potato, the highest values were observed in urea with double inhibitors treatment in both experimental years.

Variability in Commercial Sweet Potatoes (Ipomoea Batatas—L. Lam) in Trinidad

1971 ◽  
Vol 7 (1) ◽  
pp. 27-32 ◽  
Author(s):  
P. H. Haynes ◽  
D. W. Wholey
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Soil Management ◽  
Sweet Potatoes ◽  
Planting Material ◽  
Sources Of Variation ◽  
Field Experimentation

SUMMARYThe variation in number and yield of tubers from three commercial fields of sweet potato was measured over three seasons. Sources of variation were attributed to factors external to the plant, such as soil, management and climatic differences, and to inherent plant factors, including type of planting material. It is suggested that a reduction in variability could lead to increases in productivity, and may also increase the precision of field experimentation.

Differential Tolerance of Sweet Potato (Ipomoea batatas) Clones to Metribuzin

1993 ◽  
Vol 7 (2) ◽  
pp. 349-354 ◽  
Author(s):  
Carl E. Motsenbocker ◽  
Thomas J. Monaco
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Total Yield ◽  
Crop Injury

Sweet potato clones were evaluated for metribuzin tolerance in field and greenhouse studies. ‘Tinian’ was the most tolerant and ‘SC-1149-19’ and ‘J-2’ were the most susceptible clones. ‘Jewel’, a clone widely grown commercially, was sensitive to metribuzin in the field and greenhouse. ‘Sumor’ and ‘White Triumph’ exhibited intermediate metribuzin tolerance. All metribuzin application-by-rate treatments reduced plant stands, caused season-long crop injury, and reduced yields. Metribuzin applied 3 wk posttransplant at 1.1 kg ha−1did not reduce total yield of Tinian. Total yield of all the clones except Tinian were reduced by metribuzin regardless of timing or rate.

scholarly journals Performance of Sweetpotato Varieties Grown Using Black Plastic Mulch in Pennsylvania

2020 ◽  
Vol 30 (6) ◽  
pp. 797-802
Author(s):  
Luis O. Duque
Keyword(s):  
United States ◽  
Yield Components ◽  
Ipomoea Batatas ◽  
Northeastern United States ◽  
Storage Roots ◽  
Plastic Mulch ◽  
Marketable Yield ◽  
Black Plastic ◽  
Rock Springs

Sweetpotato (Ipomoea batatas) production in Pennsylvania and the northeastern United States has been increasing steadily. The performance of eight commercially available sweetpotato varieties and two unreleased accessions grown on raised beds and covered with black plastic mulch in Pennsylvania was evaluated. All varieties and accessions were evaluated in 2 successive years (2018 and 2019) at Rock Springs, PA. There were statistically significant differences in total marketable yield (TMY), but not in all yield components in both years. ‘Orleans’, ‘Beauregard’, ‘Averre’, and ‘Covington’ consistently produced high marketable yields and suitable U.S No.1 grade storage roots. ‘Bonita’ (tan skin/white flesh) and ‘Carolina Ruby’ [red skin/orange flesh (OF)] produced consistent yields in both years (range, 330–430 bushels/acre; 50-lb bushel). NC413 [purple skin (PS)/purple flesh (PF)] produced the lowest yield in 2018 and was discarded for future trials. In 2019, NCP13-0030 (PS/PF) produced good yields and shapes comparable to OF varieties. Overall total yields (TYs) measured in this study compared satisfactorily with average nationwide yields, with several varieties producing more than 500 bushels/acre.

scholarly journals 214 Yield and Quality Response of Carrot (Daucus carota L.) to Simulated Storm Damage

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 479A-479
Author(s):  
Michael E. Bartolo ◽  
Frank C. Schweissing
Keyword(s):  
Daucus Carota ◽  
Yield Components ◽  
Total Yield ◽  
Growing Season ◽  
Storm Damage ◽  
Lower Yield ◽  
Marketable Yield ◽  
Daucus Carota L ◽  
Yield And Quality ◽  
Quality Response

Parts of Colorado receive more hail than almost any other area in the nation. Severe storms can injure crop tissue and, thus, lower yield and predispose the crop to disease infection. Our study was conducted to determine the yield and quality response of carrot (Daucus carota L.) to simulated storm damage during different periods of plant development. We removed 33% and 67% of the carrot foliage at four dates, spaced 10 days apart, during the middle of the growing season. In 1997 and 1998, 67% defoliation significantly reduced total and marketable yields more than did 33% defoliation. Total yield components, length and diameter, were similarly affected. Defoliation, in general, decreased yield the greatest when it when it occurred at the later stages of development. Carrot foliage continued to develop and grow after all defoliation events. Nonetheless, moderate (33%) and severe (67%) foliage loss reduced marketable yield and yield components of carrots.

Sweet potato (Ipomoea batatas L.)-based strip intercropping: I. Interspecific interactions and yield advantage

2011 ◽  
Vol 59 (2) ◽  
pp. 137-147 ◽  
Author(s):  
M. Nedunchezhiyan ◽  
K. Laxminarayana ◽  
K. Rajasekhara Rao ◽  
B. Satapathy
Keyword(s):  
Sweet Potato ◽  
Root Length ◽  
Yield Components ◽  
Ipomoea Batatas ◽  
Finger Millet ◽  
Crop Yields ◽  
Interspecific Interactions ◽  
Plant Root ◽  
Root Diameter ◽  
Strip Intercropping

A field experiment was conducted at the Regional Centre of the Central Tuber Crops Research Institute, Dumduma, Bhubaneswar for three consecutive years (2006–2008) under rainfed conditions on Alfisols to quantify the effects of strip intercropping on crop yields and yield components. A significantly higher yield was obtained from sweet potato (Ipomoea batatas L.) border rows when pigeonpea (Cajanus cajan (L.) Millsp.) was intercropped. Analyses of sweet potato yield components indicated that the number of roots/plant, root length and root diameter were significantly higher in border rows when rice (Oryza sativa L.), finger millet (Eleusine coracana L.) and pigeonpea were used as intercrop compared to monoculture sweet potato. The number of tubers/plant of sweet potato in border rows was significantly lower when maize (Zea mays L.) was intercropped, but the root length and root diameter were found to increase compared to sole sweet potato. The yields of rice, finger millet, maize and pigeonpea in inside rows in strip cropping were a little higher than in monoculture. The yield difference was mainly due to an increase in the number of seeds/panicle or cob. Sweet potato was the dominant crop when grown with rice or finger millet, but it was the subordinate crop when grown along with maize or pigeonpea. Sweet potato yields were consistently higher in strip intercropping than in monoculture when calculated across all the strips on an equal area basis. A strip intercropping system involving sweet potato + pigeonpea resulted in a higher land equivalent ratio (1.31) and net return ( $623.9) compared to the other forms of intercropping and to monocropping.

Streptomyces ipomoeae. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
J. F. Bradbury
Keyword(s):  
Sweet Potato ◽  
Geographical Distribution ◽  
Ipomoea Batatas ◽  
Sweet Potatoes ◽  
Poor Growth ◽  
Early Stages ◽  
Green Leaves ◽  
Planting Material ◽  
Black Spots ◽  
Pale Green

Abstract A description is provided for Streptomyces ipomoeae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Ipomoea batatas. DISEASE: Soil rot, pox, pit, or ground rot of sweet potato. All underground parts of the plant can be attacked. Dark brown to black spots of varying shapes and sizes are formed on roots, tubers and underground parts of stems. In serious attacks many of the fine feeding roots are either destroyed or more or less malformed. The above-ground parts of the plants then show poor growth and thin, pale green leaves. Yields are drastically reduced on such plants. In the early stages lesions on the root-tubers are covered by the epidermis, but this cracks and breaks up, leaving a hole or pit. These pits can be quite large and may girdle the potato, preventing growth at that point. Continued growth on either side results in a dumbell-shaped, or other misshapen potato. GEOGRAPHICAL DISTRIBUTION: USA, occurring more or less locally in most, if not all, of the States where sweet potatoes are grown. (CMI Map 301, ed. 2, 1975). TRANSMISSION: The disease is soilborne and most infection is thought to take place when plants are set out into already infested fields, but infection can occur in the nursery bed. The pathogen can be spread to new areas in a variety of ways. Infected planting material is probably the most frequent, but contaminated agricultural tools, workers' boots, feet of grazing animals, and even the wheels of vehicles may also play a part. Once established in a field, the organism can continue to live in the soil until the host is present and conditions are right for infection.

scholarly journals Genotype × Environment effects on morphological and productive components of sweet potato (Ipomoea batatasL.)

2021 ◽  
Vol 17 (5) ◽  
pp. 7-15
Author(s):  
Sindi Elen Senff ◽  
Viviane de Fátima Milcheski ◽  
Ana Caroline Basniak Konkol ◽  
Ana Carolina da Costa Lara Fioreze
Keyword(s):  
Sweet Potato ◽  
Block Design ◽  
Total Yield ◽  
Root Diameter ◽  
Root Weight ◽  
Marketable Yield ◽  
Yield Data ◽  
Growing Seasons ◽  
Environment Effects ◽  
Randomized Block Design

Sweet potato (Ipomoea batatasL.) is a crop with high market demands because of its well-known health benefits. Limited use of improved clones reduces the crop’s income potential. Plant breeding programs seek to selectgenotypes with good results in a variety of environments by evaluating the interaction effects of genotypes and environments. This study aimed to assess Clone × Growing season effects on morphological and productive parameters of sweet potato clones grown in the municipality of Curitibanos, Santa Catarina, Brazil, in 2016/2017 and 2017/2018. The following clones were evaluated: Brazlândia Rosada, BRS Amélia, Beauregard, BrazlândiaRoxa, and BRS Rubissol. A randomized block design with three replications was used to investigate root length, root diameter, mean root weight, total root number, number of marketable roots, total yield, and marketable yield. Data were subjected to one-way and two-way analysis of variance. Beauregard afforded the largest number of marketable roots and was stable in both growing seasons. Beauregard, Brazlândia Roxa, and Brazlândia Rosada differed in total number of roots between growing seasons. There were no significant differences between growing seasons in mean root weight; BRS Amélia afforded a higher mean root weight than Brazlândia Rosada. Beauregard did not differ in total or marketable yield between growing seasons and provided higher yields than the other clones. BRS Rubissol and Beauregard were found to be the most promising for sweet potato cultivation under the environmental conditions of Curitibanos.

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