scholarly journals RESPONSE OF THREE SWEET-POTATO CULTIVARS GROWN IN NFT TO DIFFERENT IRRADIANCE LEVELS

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 731e-731
Author(s):  
S. Burrell ◽  
D. Mortley ◽  
P. Loretan ◽  
A.A Trotman ◽  
P. P David ◽  
...  
Keyword(s):  
Light Intensity ◽  
Ipomoea Batatas ◽  
Life Support ◽  
Block Design ◽  
Storage Roots ◽  
Light Levels ◽  
Nutrient Film Technique ◽  
Long Duration ◽  
Randomized Complete Block Design ◽  
Effect Of Light

The effects of light intensity on three sweetpotato cultivars [Ipomoea batatas (L.) Lam] were evaluated in growth chambers, as part of NASA's Closed Ecological Life Support Systems (CELSS) program for long duration space missions. Vine cuttings of `TI-155', `GA Jet', and TUJ1 were grown using nutrient film technique (NFT) in a modified half Hoagland's solution with a 1:2.4 N:K ratio in channels (0.15×0.15×1.2 m). Plants were exposed to irradiance levels of 360 or 720 umols m-2s-1 with an 18/6 photoperiod in a randomized complete block design with two replications. Temperature was set at 28:22 lightdark and RH was 70%. Differences in plant response to were more related to cultivars than the effect of light intensity. Storage root number (8) fresh, (786 g/plant) and dry weights (139 g/plant) were highest for `TI-155' while foliage fresh and dry weights were highest for `TUJ1' when averaged across light levels. TI-155' (921 g/plant) and `GA Jet' (538 g/plant) produced greater yields at higher irradiance. `TUJ1' produced a higher yield (438 g/plant at the lower intensity compared to 219 (g/plant) at the higher intensity, suggesting this cultivar could produce storage roots in similar conditions in a CELSS.

scholarly journals ALTERING NUTRIENT SOLUTION N:K RATIO TO INCREASE YIELDS OF SWEETPOTATO GROWN IN NFT

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 731b-731 ◽  
Author(s):  
D.G. Mortley ◽  
P A. Loretan ◽  
A.A Trotman ◽  
P. P David ◽  
L.C Garner ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Ipomoea Batatas ◽  
Life Support ◽  
Block Design ◽  
Dry Weight ◽  
Culture Solution ◽  
Fibrous Root ◽  
Storage Roots ◽  
Nutrient Film Technique ◽  
Long Duration

The effects of altering, nutrient solution N:K ratio on growth of `TI-155' sweetpotato [Ipomoea batatas (L.) Lam] was evaluated in a greenhouse, as part of NASA's Closed Ecological Life Support Systems (CELSS) program for long duration space missions. Vine cuttings of `TI-155', were grown using nutrient film technique (NFT) in a modified half Hoagland's solution in channels (0.15×0.15×1.2 m). Plants were grown for 42 days in a culture solution in which N was doubled (6 mM) in order to accelerate foliage growth after which treatment N:K ratios of 1:2.4, (control) 1:4.8, and 1:7.2 were initiated. A randomized complete block design with 4 replications was used. The number of storage roots/plant increased linearly as K was increased in the solution. Storage root fresh and dry weights, growth rate (g m-2 d-1), fibrous root dry weight, foliage fresh and dry weights, and edible biomass index (root mass/total plant mass), though not significant all increased as K was increased in the nutrient solution. Nutrient solution analyses showed that K uptake was greatest in plants at the highest K level, while nitrate uptake was steady over the duration of crop growth regardless of treatments.

scholarly journals PHOTOPERIOD/LIGHT INTENSITY INTERACTIONS ON GROWTH OF TWO SWEETPOTATO CULTIVARS IN NFT

HortScience ◽  
1993 ◽  
Vol 28 (4) ◽  
pp. 267D-267
Author(s):  
S. Burrell ◽  
D. Mortley ◽  
P. Loretan ◽  
L. Garner ◽  
A. Trotman ◽  
...  
Keyword(s):  
Light Intensity ◽  
Ipomoea Batatas ◽  
Block Design ◽  
Dry Weight ◽  
Storage Root ◽  
Fresh Weight ◽  
Fibrous Root ◽  
Nutrient Film Technique ◽  
Randomized Complete Block Design ◽  
Lower Light

The effects of photoperiod and light intensity on two sweetpotato cultivars [Ipomoea batatas (L.) Lam] were evaluated in growth chambers. Vine cuttings of `TI-155' and `GA Jet' were grown using nutrient film technique (NFT) in a modified half Hoaglands solution with a 1:2.4 N:K ratio in channels (0.15×0.15×1.2 m). Plants were exposed to 9:600 or 18:300 umols m-2 s-1 photoperiod:light intensity treatments in a randomized complete block design with two replications. Temperature was set at 28:22 light:dark and RH was 70%. Storage root fresh and dry weights and fibrous root dry weight for both cultivars were significantly higher for plants exposed to longer photoperiod and lower light intensity than for those at a shorter photoperiod and higher light intensity. Foliage fresh weight for TI-155' was higher at 18:300 photoperiod:light intensity but dry weights were similar. Foliage fresh and dry weights for `GA Jet' and number of storagage roots/plant for both cultivars were similar regardless of treatments.

scholarly journals Light Intensity and Biofertilizers Effect on Natural Indigo Production and Nutrient Uptake of Indigofera tinctoria L.

2020 ◽  
Author(s):  
D. Setyaningrum ◽  
M.T.S Budiastuti ◽  
B. Pujiasmanto ◽  
D. Purnomo ◽  
Supriyono Supriyono
Keyword(s):  
Light Intensity ◽  
Nutrient Uptake ◽  
Block Design ◽  
Fresh Weight ◽  
Randomized Complete Block Design ◽  
Plant Yields ◽  
Indigo Production ◽  
Tissue Nitrogen ◽  
Synergistic Relationship ◽  
Effect Of Light

This research investigated the effect of light intensity and biofertilizer on the yield, which includes the production of indigo compounds and plant nutrient uptake. The study used a randomized complete block design with a split plot design with 4 levels of light intensity as the main plots and 4 levels of biofertilizer as a sub plots with 3 replications. The combination of light intensity and biofertilizer affects fresh weight, biomass and tissue nitrogen. The highest fresh weight and biomass was found at 100% light intensity with double inoculation of mycorrhizae and rhizobium. Whereas the highest tissue nitrogen was at 10% light intensity with double inoculation of mycorrhizae and rhizobium. The production of indigo affected by light intensity, ie at 10% light intensity indicates the highest indigo. Mycorrhizae and rhizobium have a synergistic relationship as biofertilizer in increasing plant yields and nutrient uptakes in 100% light intensity.

scholarly journals BORON APPLICATION TIMING AND RATE ON BLISTER-LIKE SYMPTOMS IN `HERNANDEZ'

HortScience ◽  
1996 ◽  
Vol 31 (5) ◽  
pp. 760g-761
Author(s):  
Jonathan R. Schultheis ◽  
Dennis E. Adams
Keyword(s):  
Foliar Application ◽  
Block Design ◽  
Storage Roots ◽  
Fresh Market ◽  
Application Timing ◽  
Yield And Quality ◽  
Randomized Complete Block Design ◽  
Good Yielding ◽  
And Storage

Boron has been used to overcome the disorder blister in varieties such as `Jewel'. `Hernandez' is an attractive, good-yielding variety with uniform shape that will consistently pack out at 80% to 90%. Over time in storage, however, roots develop blister-like symptoms, rendering roots unmarketable for fresh market. Our objective was to evaluate the effect of different B rates and application times on the yield and quality of `Hernandez' roots. Rates were varied up to 2.24 kg actual B/ha 6 days after planting, while various soil and foliar application times (6, 34, and 69 days after planting) were evaluated at 1.12 kg·ha–1. In 1994, three row plots were arranged in a randomized complete block design and replicated four times. Planting was on a deep sand to maximize the effect of the B carrier Solubor. Roots were harvested, graded, and weighed 120 days after planting and storage roots evaluated for blister-like symptoms in Mar. 1995. No significant differences in yield were attributed to B rate or application method. Blister-like symptoms were more severe when no B was applied; however, application of B did not eliminate symptoms, as most roots had the blister-like appearance. Boron application did not solve the problem, but symptoms were less apparent when some B was applied.

scholarly journals Effect of cutting position and vine pruning level on yield of Sweet Potato (Ipomoea Batatas L.)

1970 ◽  
pp. 01-05
Author(s):  
Ncube Netsai ◽  
Mutetwa Moses, Mtaita Tuarira
Keyword(s):  
Sweet Potato ◽  
Root Length ◽  
Ipomoea Batatas ◽  
Block Design ◽  
Root Diameter ◽  
Root Weight ◽  
Stem Cuttings ◽  
Storage Root ◽  
Storage Roots ◽  
Significant Difference

There is significant variation in yield of storage roots and vines of sweet potato (Ipomoea batatas) among farmers due to use of different cutting positions and pruning of vines at different levels. This study was carried out to establish the cutting position and the vine pruning level that give the best yield of both the storage roots and vines. The study was conducted in a 3x3 factorial arrangement in Randomized Complete Block Design (RCBD) with three replications. Treatments included cutting position at three levels (apical cutting, middle cutting and basal cutting) and pruning at three levels, 0%, 25% and 50% respectively. Pruning was done. 50 days after planting. And storage root harvesting was done 100 days after planting. The two measurements were summed up to give the total vine weight. Storage root length, diameter and weight were measured at 100 DAP. Storage root length indicated significant difference (P<0.05) only among cutting positions with highest mean length (16.20 cm) obtained from apical cutting and the lowest (11.98 cm) from basal cutting. Storage root diameter, storage root weight and vine weight indicated significant interaction (P<0.05) of cutting position and vine pruning level. Highest mean root diameter and root weight were obtained from middle cutting and 25% vine pruning level, with the lowest being obtained from basal cutting and 50% vine pruning level. Highest vine weight was recorded from middle cutting and 50% vine pruning level, with the lowest being recorded from basal cutting and 0% vine pruning level. Both middle and apical stem cuttings can be recommended for higher storage root and vine yield. Vine pruning at 25% can be adopted for higher storage root yield while pruning at 50% can be suggested for higher vine yield.

The effect of light intensity of blinking LED toward coral fishes catch of trap in the waters of Ternate Island

2013 ◽  
Vol 1 (1) ◽  
pp. 39
Author(s):  
Janhar Al Ammari
Keyword(s):  
Light Intensity ◽  
Block Design ◽  
High Light Intensity ◽  
Moon Phase ◽  
Randomized Block Design ◽  
Species Analysis ◽  
Significant Difference ◽  
Control Light ◽  
And Control ◽  
Effect Of Light

Using blinking Light Emiting Diode (LED) could increase the fishing power of bottom traps. The objective of this research was to study the effect of light intensity of LED (blinking lamp) inside the trap and moon phase toward the capture of coral fishes. Three light intensities of LED were used: 35 lux (2 LED), 70 lux (4 LED), 105 lux (6 LED) and one without blinking lamp as a control. Catch data were collected using 12 units of bottom traps operating in coral waters of Ternate Island at depths around 5 to 7 m.Data analysis wasdone based on randomized block design. The catch was 181 fish in total comprising 12 families, 17 genera and 28 species. Analysis of variance showed that using different light intensity of LED on bottom traps and different moon phase caused highly significant effect in catch. Least significant differences test showed that using light intensity 105 lux (6 LED) inside the trap is not significant in catch to 70 lux (4 LED), but highly significant to 35 lux (2 LED) and control. Light intensity 70 lux (4 LED) is not significant in catch to 35 lux (2 LED), but highly significant to control. There was no significant difference between light intensity 70 lux (4 LED) and control. Catch of trap could increase when using higher light intensity of blinking lamp (LED) and the catch of trap also increase when operated around dark moon. It is better to use high light intensity of blinking lamp (105 lux) inside the trap, and operated in dark moon to catch coral fishes© Penggunaan lampu LED (Ligh Emiting Diode) berkedip didalam bubu diduga dapat meningkatkan kemampuan tangkap. Penelitian ini bertujuan untuk mempelajari pengaruh intensitas cahaya lampu LED berkedip di dalam bubu dan fase umur bulan terhadap hasil tangkapan ikan-ikan karang. Tiga jenis intensitas cahaya lampu yang digunakan, yaitu 35 lux (2 LED), 70 lux (4 LED), 105 lux (6 LED), dan lampu LED tanpa berkedip sebagai kontrol. Data dikumpulkan dengan mengoperasikan 12 unit bubu di perairan karang Pulau Ternate pada kedalaman sekitar 5–7 m; dan dianalisis berdasarkan Rancangan Acak Kelompok. Hasil tangkapan total sebanyak 181 ekor; terdiri dari 15 famili, 25 genus, dan 35 jenis. Analisis sidik ragam menunjukkan bahwa perbedaan intensitas cahaya lampu LED dalam bubu dan perbedaan fase umur bulan berpengaruh sangat nyata terhadap hasil tangkapan. Hasil uji BNT untuk perlakuan menunjukkan bahwa penggunaan lampu 6 LED (105 lux) pada bubu tidak berbeda nyata dengan penggunaan lampu 4 LED (70 lux) tetapi berbeda sangat nyata dengan penggunaan lampu 2 LED (35 lux) dan Kontrol. Demikian juga lampu 4 LED tidak berbeda nyata dengan lampu 2 LED tetapi berbeda sangat nyata dengan Kontrol; sedangkan antara lampu 2 LED dan Kontrol tidak ada perbedaan yang nyata. Hasil tangkapan bubu meningkat ketika menggunakan lampu kedip dengan intensitas yang lebih tinggi; dan dioperasikan pada saat bulan gelap. Sebaiknya menggunakan lampu LED berkedip 105 lux dan dioperasikan saat bulan gelap untuk menangkap ikan-ikan karang dengan bubu©

scholarly journals Propagation of Aloysia citriodora Palau Using Different Cutting Types under Light Intensity

2020 ◽  
pp. 1-9
Author(s):  
Orivaldo Benedito da Silva ◽  
Ademir Goelzer ◽  
Cleberton Correia Santos ◽  
Elissandra Pacito Torales ◽  
Néstor Antonio Heredia Zárate ◽  
...  
Keyword(s):  
Light Intensity ◽  
Vegetative Propagation ◽  
Block Design ◽  
Survival Rates ◽  
Dry Mass ◽  
Light Conditions ◽  
Fresh Weight ◽  
Mato Grosso ◽  
Randomized Complete Block Design ◽  
Mato Grosso Do Sul

Aims: The aim of this study was to evaluate the effect of types of cuttings and light intensity on cidró vegetative propagation. Place and Duration of Study: Medicinal Plants Garden, Federal University of Grande Dourados (UFGD), Dourados, state of Mato Grosso do Sul, Brazil, September to November 2016. Methodology: The experiment was carried out under two light conditions (shaded and full light), evaluating three types of cuttings (softwood, semi-hardwood and hardwood). Experimental design was a 2 x 3 factorial randomized complete block design (RCBD) with four replications. Results: Hardwood cuttings showed the highest survival rates (86% and 82%), regardless of light. Highest fresh weight (0.6062 g plant-1) and dry mass (0.2987 g plant-1) with a leaf of 44.57 cm2 were from hardwood cuttings, regardless of the light, while the longest root length were those of softwood cuttings under full light. Physiological indices varied as a function of light intensity, The highest values of leaf area ratio (46.11 cm2 g-1) and specific leaf mass (0.0037 g cm-2) occurred in cuttings under full light. Conclusion: The vegetative propagation of cidró can be carried out using the hardwood portion of the cutting branch, under full light.

scholarly journals Effect of light intensities on the flowering and growth of spiny coriander (Eryngium foetidum L.)

1969 ◽  
Vol 75 (4) ◽  
pp. 383-389
Author(s):  
Luis R. Santiago-Santos ◽  
Arturo Cedeño-Maldonado
Keyword(s):  
Light Intensity ◽  
Block Design ◽  
Second Phase ◽  
Fresh Weight ◽  
Full Sunlight ◽  
Leaf Chlorophyll ◽  
Light Intensities ◽  
Eryngium Foetidum ◽  
Two Phases ◽  
Effect Of Light

An experiment was performed at the Alzamora Experiment Farm of the Mayagüez Campus, University of Puerto Rico, to evaluate the effect of light intensity on the growth and flowering of spiny coriander, Eryngium foetidum L. The study was divided in two phases: 1) the seedling phase, which lasted from seeding to the first harvest, and 2) the second phase, from the first to the second harvest. All plants were placed under cover of transparent polyethylene. Three of the treatments were covered by Saran plastic with different densities to reduce light intensity to 47, 63, and 73%. Treatments were arranged in a randomized complete block design with three replications. A significant delay in flowering was observed in plants grown at 63 and 73% shade. An increase was observed in fresh weight of leaves of plants grown at 63 and 73% shade levels vs those in full sunlight. Plants grown under shade had fewer inflorescences with lower fresh weight than plants grown under full sunlight. No significant differences were found on leof number between plants grown at different light intensities. Leaf chlorophyll content of spiny coriander increased in plants grown under low light intensities.

scholarly journals GROWTH OF GREEN PEPPER AND LETTUCE TRANSPLANTS AS EFFECTED BY MYCORRHIZAE, MEDIA, AND CONTAINER TYPE

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 662b-662
Author(s):  
Ray A. Watson ◽  
Katrine A. Stewart ◽  
Valentin Furlan
Keyword(s):  
Growth And Development ◽  
Block Design ◽  
Additional Experiment ◽  
Growing Media ◽  
Green Pepper ◽  
Randomized Complete Block Design ◽  
Split Plot ◽  
Supplemental Lighting ◽  
Container Type ◽  
Effect Of Light

The effects of two mycorrhizal species (Glomus versiforme and Glomus intraradix) and a control on the growth of green pepper, Capsicum annuum, and lettuce, Lactuca sativa, seedlings have been evaluated using three types of growing media (Fafard bulk mix, Cornell mix and a compost based mix) and two types of containers, Cell Packs (125 cubic cm volume) and Pro-Trays (65 cubic cm volume) for green pepper and Cell Packs (125 cubic cm volume) and Plug Flats (33 cubic cm volume) for lettuce. The experiments used a split plot randomized complete block design with 4 blocks, and were carried out in a double-poly greenhouse in 1991. Supplemental lighting was provided by HPS lights with a 16 hour photoperiod. Seeds were sown directly into the containers of mycorrhizal inoculated media. All treatments received the same fertilizer regime. Plants in the higher volume cells were larger than those in the smaller volume cells for both pepper and lettuce. The Fafard Bulk Mix and the Compost mix gave larger plants than did the Cornell mix for both crops. An additional experiment examining the effect of light type on mycorrhizal transplant growth and development is underway and will be presented.

scholarly journals Survival of sweetpotato (Ipomoea batatas [L] Lam) vines in cultivars subjected to long dry spells after the growing season in Mozambique

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Maria I. Andrade ◽  
Godwill S. Makunde ◽  
Jose Ricardo ◽  
Joana Menomussanga ◽  
Abilio Alvaro ◽  
...  
Keyword(s):  
Ipomoea Batatas ◽  
Block Design ◽  
Growing Season ◽  
Sub Saharan Africa ◽  
Planting Material ◽  
Dry Spells ◽  
Dry Spell ◽  
Randomized Complete Block Design ◽  
Sub Saharan ◽  
Important Objective

AbstractOptimisation of sweetpotato production potential is not realized in sub-Saharan Africa where dry spells are common after the growing season. Lack of seed cultivars at the beginning of the rainy season is the challenge and identifying those cultivars with the ability to survive a 4 to 7-month dry spell is an important objective in these regions. To this end, the purpose of the present study was to estimate survival of vines of different cultivars under drought stress. Three harvesting times set as 5, 9 and 11 months after planting were established at Umbeluzi, Nwallate and Gurue in 2015. For each harvesting time, 37 clones were evaluated in a randomized complete block design with two replications. Data collected on yield, vine length and number of sprouts were analysed using SAS 1996. Resisto had long stems but no vines after 9 months at any of the sites. The ability of some clones to reach 9 months and 11 months with few vines at Umbeluzi and Nwallate offer sources of planting material for the subsequent season. Sprouting had broad sense heritability above 50%. Sprouting is known to be an important aspect of cultivar survival. While we show that vine length and thickness could be traits responsible for sweet potato drought tolerance

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