Effect of Tillage,  Irrigation,  and Nutrient Levels on Growth and Yield of Sweet Potato in Rice Fallow

Nedunchezhiyan, M.; Byju, G.; Ray, R.

doi:10.5402/2012/291285

Cited by 42 publications

(50 citation statements)

References 10 publications

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“…A significant increase in LAI values was observed from 60 DAP to 120 DAP, which can be attributed to the plants still being in the above-ground exponential growth phase. This is somewhat in contrast to the observation of Nedunchezhiyan et al (2012) who observed a decline in LAI values from 95 DAP until harvest. The canopy cover of the sweet potato cultivars were affected by the drought conditions imposed in the three trials, as seen in declining values from control to mild stress and/or severe stress treatments.…”

Section: Trialcontrasting

confidence: 99%

“…This in agreement with results obtained by Nedunchezhiyan et al (2012), who observed significant differences in LAI values of sweet potato plantings at different soil water levels. In the present study, the cultivars Isondlo, Purple Sunset, Resisto, W-119 and Zapallo, as well as breeding lines 2005-12-2 and 2006-3-4, showed increasing canopy coverage at 120 DAP when the severe stress treatment is compared to the control treatment ( Table 2).…”

Section: Trialsupporting

confidence: 93%

“…This indicated that the plants were well watered and did not experience any stress. A significant decrease in stem length in all of the cultivars was also observed when comparing the control to the severe stress condition, which is in agreement with the findings of Nedunchezhiyan et al (2012).…”

Section: Trialsupporting

confidence: 90%

“…Although some species and more specific cultivars do have the ability to withstand drought for certain periods of time, it is important that these cultivars must have the ability to produce a reasonable yield notwithstanding the poor canopy development during drought conditions. It is known that leaf area in sweet potato plants decreases as water stress increases (Nedunchezhiyan et al, 2012). Leaf area index (LAI), which measures canopy cover as leaf area per unit ground surface area, is an indication of the leaf material in an ecosystem or trial area.…”

Section: Introductionmentioning

confidence: 99%

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Yield of Drought-Stressed Sweet Potato in Relation to Canopy Cover, Stem Length and Stomatal Conductance

Laurie¹,

Laurie²,

Plooy³

et al. 2014

JAS

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Sweet potato is generally considered as a drought tolerant crop, however, due to large genotypic differences, appropriate genotypes adapted to drought conditions must be identified. The aim of the study was to investigate the suitability of canopy cover, stem length and stomatal conductance to differentiate performance of sweet potato genotypes subjected to drought stress. Seven sweet potato cultivars and six elite lines were subjected to three water treatments, namely, a control (100%) treatment which received the full complement of plant available water (PAW) once soil water had depleted to 70% PAW, while the other two treatments received 60% (mild stress) and 30% (severe stress) of the calculated water that the control treatment received in rainout shelters. Pearson correlations were performed on measured parameters yield, leaf area index (LAI), stem length and stomatal conductance (g s ). Genotypic differences were observed for LAI values and indicated that the cultivar Purple Sunset was better adapted to soil moisture stress at the mild stress and severe stress conditions than the other cultivars included in the trials. The cultivars Purple Sunset and Blesbok indicated a better ability to adapt to moisture stress, with regards to stem length, by outperforming the other genotypes in Trials 1 and 3. Drought had a severe effect on the yield of all the genotypes, especially at severe stress. Resisto, Bophelo and 199062.1 produced the highest yield at the mild stress, with significant correlations between yield and the parameters LAI, stem length and stomatal conductance. This indicated that above-ground growth had a direct influence on plant growth below-ground. The correlations also indicated that LAI and stomatal conductance played a more important role than stem length in achieving yield, and, thus, could be useful screening methods for drought tolerance of sweet potatato.

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Section: Trialcontrasting

confidence: 99%

Section: Trialsupporting

confidence: 93%

Section: Trialsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Yield of Drought-Stressed Sweet Potato in Relation to Canopy Cover, Stem Length and Stomatal Conductance

Laurie¹,

Laurie²,

Plooy³

et al. 2014

JAS

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show abstract

“…In order to make the maximized profit (Nedunchezhiyan et al, 2007) and acquire higher land equivalent ratio (LER) and yield stability (Wells et al, 2000;Skelton and Barrett, 2005), which was the ultimate aim of intercropping. Maize means shading to a great extent, though excess cloudiness encourage vegetative growth, it causes yield reduction (Nedunchezhiyan et al, 2012), especially main crop (Gliessman, 1985). Mead (1980) claimed that the benefits of multiple cropping are achieved by the simple suitability of growing crops together.…”

Section: Introductionmentioning

confidence: 99%

Effect of Maize (Zea mays L.) Plant-Type on Yield and Photosynthetic Characters of Sweet Potato (Ipomoea balatas L.) in Intercropping System

Luo

Tang

et al. 2017

Not Bot Horti Agrobo

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Sweet potato/maize relay-cropping mode is considered as the main farming practices of dry land in Southwest China. Although relay-cropping would cause the reduction of fresh tuber yield, it still remained unclear that the reason was shade resulted from maize or genotype of sweet potato. The present work aims at exploring the effects of maize (Zea mays L.) planttype on photosynthetic physiology and yield of sweet potato (Ipomoea balatas L.) in relay-cropping system. Besides, three plant-types maize cultivars including compact, semi-compact and expanded type were used for relay-cropping with different sweet potato cultivars ('Yushu-2', 'Yushu-6' and 'Nanshu-88') in field. The results showed that the photosynthetically active radiation (PAR) was declined with the increase of expansion of maize plant-type, which decreased by 77.5%, 80.1% and 82.1% respectively. When relay-cropped with extended maize, the yield reduction rate of sweet potato was the highest (67%). The shade-resistance of different genotype of sweet potatoes was different, and the yield reduction rate of 'Yushu-2' was the lowest (37.01%). Through conducting correlations analysis, it showed that fresh tuber yield had significant positive correlation with Effective Quantum Yield (Y(II)) and significant negative correlation with Non Photochemical Quenching Coefficient (NPQ). In terms of 'Yushu-2', the proportion of heat dissipation was the lowest, and its light quantum efficiency was higher than others. As a result, its reduction rate of yield was lower than the other two. We suggested that compact maize cultivar relay-cropping with strong shade-resistance sweet potato cultivar should be mainly applied in practice of sweet potato.

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Differences in transport of photosynthates between high-and low-yielding Ipomoea batatas L. varieties

et al. 2015

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Previous studies have focused mainly on the accumulation of photosynthates and less on their distribution in sweet potato (Ipomoea batatas L.). In addition, the effect of photosynthate accumulation in root tubers on photosynthate distribution was not considered. Thus, a field experiment was carried out from May to October (2011 and to clarify the differences in photosynthate transport between high-and low-yielding sweet potato. This study mainly focused on the photosynthetic capacities of leaves, photosynthate distribution, and characteristics of photosynthate accumulation in root tubers. Results showed the high-yielding varieties displayed the higher fresh root tuber yield and the economic coefficient than the low-yielding varieties. They also showed greater net photosynthetic rate with a pronounced increase at the early and middle growth stages (8.9% and 11.4%, respectively). After the growth peak, the leaf area index (LAI) of the highyielding varieties decreased with time and was maintained at 2~3 until harvest, whereas the LAI of the low-yielding varieties decreased slowly. The high-yielding varieties reached the 13 C distribution rate ≥ 50% at the early (2011, 2012) and middle (2011) growth stages, whereas the low-yielding varieties reached it at the late (2011) or middle (2012) growth stages. At harvest, the 13 C distribution rates in the branches and root tubers of the high-yielding varieties were 6.020.3% and 73.791.2%, respectively, whereas those of the low-yielding varieties were 29.634.7% and 60.763.5%, respectively. The high-yielding varieties showed the remarkable initial potential in root tubers, which was much better than that of the low-yielding varieties. The high-yielding varieties also produced heavier root tubers and the higher number of root tubers per plant at the early bulking stage. The root tubers also attained the greater content of soluble sugar and starch. The high-yielding varieties formed root tubers earlier, showed strong abilities to transport photosynthates into the root tubers, and exhibited a higher mean accumulation rate. These varieties could also reduce the photosynthate consumption in branch leaves and stems. Therefore, the high-yielding varieties established growth advantage for the root tubers earlier. It contributed to a reasonable distribution structure of photosynthates that led to the high root tuber yield. Based on our results, effective agricultural measures can be chosen to improve the root tuber yield of sweet potato.

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Effect of Tillage, Irrigation, and Nutrient Levels on Growth and Yield of Sweet Potato in Rice Fallow

Cited by 42 publications

References 10 publications

Yield of Drought-Stressed Sweet Potato in Relation to Canopy Cover, Stem Length and Stomatal Conductance

Yield of Drought-Stressed Sweet Potato in Relation to Canopy Cover, Stem Length and Stomatal Conductance

Effect of Maize (Zea mays L.) Plant-Type on Yield and Photosynthetic Characters of Sweet Potato (Ipomoea balatas L.) in Intercropping System

Differences in transport of photosynthates between high-and low-yielding Ipomoea batatas L. varieties

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