scholarly journals Effect of dehaulming on yield of seed potatoes

1970 ◽  
Vol 34 (3) ◽  
pp. 443-448
Author(s):  
AA Mahmud ◽  
Sajeda Akhter ◽  
MJ Hossain ◽  
MKR Bhuiyan ◽  
MA Hoque
Keyword(s):  
Key Words ◽  
Seed Production ◽  
Seed Potato ◽  
Seed Size ◽  
Tuber Yield ◽  
Seed Tuber ◽  
Potato Production ◽  
Potato Seed ◽  
Seed Potato Production ◽  
Seed Potatoes

The yield of seed size tubers was assessed in five standard potato cultivars (Cardinal, Multa, Ailsa, Heera, and Dheera) in relation to dates of dehaulming (65, 70, and 80 days after planting) in a Seed Potato Production Farm, Debijong, Panchagarh during 1996-97 and 1997-98. Dehaulming at 70 days gave maximum seed size tubers (19.75 t/ha ≈ 76%) but significantly identical to 75 days (19.56 t/ha ≈70%) and 80 days (18.69 t/ha ≈ 63%). Considering all the parameters studied, the performance of Heera proved to be best among the cultivars grown. Among the cultivars, the maximum seed tuber yield was recorded from Cardinal at 80 DAP followed by Heera and Cardinal at 70 DAP, Dheera and Ailsa at 75 DAP. In general, most of the cultivars gave the maximum seed tuber yield when the crop was dehaulmed at 70 and 80 DAP and the lowest from 65 DAP. Key Words: Dehaulming, potato, seed production. DOI: 10.3329/bjar.v34i3.3970 Bangladesh J. Agril. Res. 34(3) : 443-448, September 2009

scholarly journals Growth-associated factors and pre-basic seed production of ten native potato varieties using aeroponic conditions in Kishuara -Peru

2017 ◽  
Vol 21 (2) ◽  
pp. 25-38
Author(s):  
S. Medina-Quispe, S. Quispe-Chipana, J. Veneros-Guevara, C.A. Chuquillanqui-Sotomayor, C.A. Bolaños-Carriel
Keyword(s):  
Seed Production ◽  
Production System ◽  
Associated Factors ◽  
Seed Tuber ◽  
Potato Production ◽  
Tuber Formation ◽  
Experimental Unit ◽  
Average Weight ◽  
Potato Seed ◽  
Basic Seed

This experiment was carried out in the greenhouse of the sub-region agrarian direction at Kishuara district in the province of Andahuaylas of the Apurimac region of Peru under the aeroponic production system. Growth-associated factors and pre-basic seed production were evaluated in ten varieties of native potatoes using aeroponic conditions in Kishuara - Peru. A complete randomized blocks design was used, and the experimental unit consisted of 12 plants spaced at 20 cm x 18 cm. The variables under study were: height of the plant (average of 12 sampling plants), days to the tuber formation, survival rate (%), days to senescence of the plant, diameter of the stem at senescence, days to the first harvest, yield, number of tubers per plant, and the average weight of tubers. Huayro variety reached the highest growth in plant height (133 cm), the highest yield (981 g / plant), and the highest average weight of mini tubers/plant (12.5 g / plant). The Q'ompis variety was the most precocious (39 days to tuber formation). The days to the first harvest were 96 days for the varieties: Duraznillo, Yana Suytu, Q'ompis and Camotillo, and 125 in Q’eq’orani. Huayro seems to be the best variety to be used for generation of new cultivars and exploitation as native variety for potato seed tuber under aeroponic production system. Our study open the possibility for production of best quality pre-basic seed for native potato production in Peru.

Effects of date of planting, date of harvesting and seed rate on yield of seed potato crops

1992 ◽  
Vol 118 (3) ◽  
pp. 289-300 ◽  
Author(s):  
P. J. O'Brien ◽  
E. J. Allen
Keyword(s):  
Seed Potato ◽  
Seed Size ◽  
Seed Yield ◽  
Seed Tuber ◽  
Potato Production ◽  
East Anglia ◽  
Seed Rate ◽  
The Uk ◽  
Seed Crops ◽  
Potato Crops

SUMMARYFourteen experiments which studied effects of date of planting in July, date of harvesting and seed rate on seed tuber yields (10–51 mm) of several potato varieties were carried out in four seasons in East Anglia. Seed tuber yields of c. 30 t/ha in Estima, Wilja and Maris Piper and 20 t/ha in Record were produced from the early planting and in all varieties c. 20 t/ha were produced from planting in late July. For maximum seed yield in all varieties, seed rates of 1·5–2 t/ha were sufficient for most harvests from both dates of planting but for the earliest harvest of the late-July planting, seed rates of only 1–1·5 t/ha were required. The value of seed crops was assessed as the number of ware hectares that could be replanted from the seed yield of one hectare graded 10–51 mm. In all varieties, the number of seed-size tubers and replantable hectares increased with increasing seed rate over most of the range, but numbers were close to the maximum at the early harvests. With delay in harvesting, the number of seed tubers and replantable hectares decreased in many experiments, especially from low seed rates, as more tubers exceeded the upper seed size limit. Maximum numbers of replantable hectares of 15, 15, 20 and 25 were found in Record, Estima, Wilja and Maris Piper, respectively.The monetary value of seed crops of Record and Maris Piper was calculated using (i) a fixed price per tonne of seed and (ii) cost of seed per replantable ware hectare. Sale values from the latter were substantially higher than from the former at early harvests in Record and at all harvests in Maris Piper. In Record, differences in sale value between the two pricing methods decreased with delay in harvesting as yields increased while number of replantable hectares varied little. The results showed that high multiplication rates and monetary returns can be obtained from short-season seed potato crops which may follow crops harvested earlier in the same season. The implications for potato production in the UK are discussed.

scholarly journals Influence of Phosphorus Fertilizer on Potato Seed Production in Acid Soils in Kenya

2020 ◽  
Vol 9 (2) ◽  
pp. 101
Author(s):  
Evans Mutange Akoto ◽  
Caleb O. Othieno ◽  
Julius O. Ochuodho
Keyword(s):  
Potato Tuber ◽  
Seed Potato ◽  
Tuber Yield ◽  
Seed Tuber ◽  
Germination Percentage ◽  
Total Carbon ◽  
Available Phosphorus ◽  
Potato Seed ◽  
Phosphorus Fertilizer ◽  
Soil Available Phosphorus

One of the major challenges facing potato (Solanum Tuberosum L) production in Kenya is the inadequate supply of high-quality seed. The required amount of potato seed in Kenya is about 70,000 tones annually but, only 1 % is available. Otherwise, farmers use low quality farm saved seed (KEPHIS, 2016). A major contributor to this situation is low and declining soil fertility, particularly phosphorus, among other challenges. Unfortunately, there is no available phosphorus fertilizer rate recommendation for seed potato production in Kenya. This hinders economic utilization of phosphorus fertilizers to achieve optimal production of quality potato seed in Kenya where its deficiencies are dominant. Therefore, this study investigated influence of different rates of phosphorus fertilizer on seed potato tuber yield and quality in three acidic (pH ≤ 5.8) test sites: Lari, Ainabkoi and Saboti sub Counties. Unica and Shangi varieties were tested. The field experiment was a split plot arrangement in Randomised Complete Block Design (RCBD) with six treatments (0 N & 0 P), 0, 30, 60, 90 and 120 kg ha-1 phosphorus, replicated three times. Data collected included tuber weight, number of tubers, tuber grade, number of eyes per tuber, tuber specific density and final germination percentage. To monitor soil nutrient dynamics, soil pH, soil available phosphorus, total nitrogen, total carbon, potassium, calcium, magnesium, copper, iron, zinc, sodium and exchangeable acidity (Lari only) were determined at planting while available phosphorus and potato tuber phosphorus were determined at harvesting. Data was statistically analysed using ANOVA at 5 % confidence levels with General Statistics (GENSTAT) and excel softwares. Results indicated that phosphorus rate significantly influenced seed tuber yield in the test sites. At Saboti, (0N & 0P) and no phosphorus application treatments for Shangi and Unica resulted in the highest seed tuber yield of 33.7 t ha-1 and 33.2 t ha-1, respectively. At Ainabkoi, application of 60 kg ha-1 and 30 kg ha-1 phosphorus produced the highest seed tuber yields of 20.0 t ha-1 and 18.9 t ha-1 of Shangi and Unica, respectively. In Lari, application of 60 kg ha-1 and 90 kg ha-1 phosphorus produced the highest seed tuber yields of 19.0 t ha-1 and 10.4 t ha-1 of Shangi and Unica, respectively. Unica had better final germination percentage than Shangi. During the season, there was a build-up of soil available phosphorus. Thus, there is need for farmers to test their soils at the onset of every potato season.

scholarly journals Accelerating Seed Potato Production By Using Rapid Multiplication Systems in Ethiopia

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Lemma Tessema Gebrehanna ◽  
Abebe Chindi ◽  
Gebremedhin Wgiorgis ◽  
Atsede Solomon ◽  
Egata Shunka ◽  
...  
Keyword(s):  
Developing Countries ◽  
Seed Production ◽  
Seed Potato ◽  
Potato Production ◽  
Research Centre ◽  
Early Generation ◽  
Seed Potato Production ◽  
Rapid Multiplication ◽  
Clean Seed ◽  
Good Quality Seed

Ethiopia is one of the major potato producing countries of the Sub-Saharan Africa region where potato is the fastest expanding food crop. The natural environment in Ethiopia is very suitable for year round production of potato using rain-fed and irrigated systems. However, the actual potato yield in the country ranges between 8-10 t/ha, which is slightly below the average for Africa. Shortage of good quality seed has been recognized as the single most important factor limiting potato production in the developing countries including Ethiopia. Therefore, the objective of this paper is to review the accelerating role of rapid seed potato multiplication technologies for potato seed production in Ethiopia. A low adoption of recommended seed potato technologies in the country could be due to a lack of alternative seed potato production methods compatible with farmers’ economic and agro-ecological conditions. Since 2010, Holetta Agricultural Research Centre in collaboration with International Potato Center together are applying different seed potato production hastening schemes to produce early generation seed. These seed multiplication schemes include, tissue culture, aeroponics, sand hydroponics and other rapid multiplication methods in screen house pots. These seed potato multiplication schemes brought a dynamic change for the last five years by accelerating the supply efficiency by 7.6%  with enhancing the number from 43,773 mini-tubers to 332,485 mini-tubers. Moreover, these new seed multiplication schemes enhanced the capacity of clean seed production of the country by producing 216,717 mini-tubers of high quality seed from aeroponics and sand hydroponics. The farmers could also access early generation clean seed potato through their nearby cooperatives with affordable price and with lowtransportation cost. Thus, for developing countries like Ethiopia where formal seed system is at infant stages and early generation seed is mostly produced by research institutions, the use of various rapid multiplication techniques could be one option to produce clean seed potato.

The effect of the site of seed potato production on subsequent sprout growth and tuber yield

1979 ◽  
Vol 92 (1) ◽  
pp. 227-233 ◽  
Author(s):  
D. C. E. Wurr
Keyword(s):  
Seed Production ◽  
Tuber Yield ◽  
Negative Relationship ◽  
Potato Production ◽  
Stem Density ◽  
Seed Potato Production ◽  
Sprout Length ◽  
Soil Temperatures ◽  
Final Yield ◽  
Sprout Growth

SummaryIn 1974 and 1975 certified Scottish seed tubers were multiplied at four sites of different altitude which had different mean soil temperatures. The progeny tubers were subsequently grown to produce a ware crop at Wellesbourne in 1975 and 1976. In 1975, the effects of the site of seed production on sprout growth and tuber yield of the ware crop were small though there was an indication of a negative relationship between total tuber yield and the temperature at each site. In 1976 the effect of the site of seed production was more marked. The total sprout length per tuber of both the varieties used was greatest from the hottest site and least from the coolest site. In the field the final yield of both varieties was lowest from the hottest site and greatest from the coolest site of seed production. There was no indication that the effect of the site of seed production on tuber yield occurred as a result of differences in stem density.

scholarly journals Agro-techniques for Production of Seed Size Tubers in Conventional Seed Potato Production System–A Review

2021 ◽  
Vol 12 (3) ◽  
pp. 238-246
Author(s):  
Murlidhar J. Sadawarti ◽  
◽  
S. P. Singh ◽  
R. K. Singh ◽  
Subhash Katare ◽  
...  
Keyword(s):  
Seed Potato ◽  
Seed Size ◽  
Seed Tuber ◽  
Total Yield ◽  
Size Variation ◽  
Potato Production ◽  
Tuber Size ◽  
Seed Spacing ◽  
Size Tuber ◽  
Major Factors

The seed potato cost is very important component in total potato production and account for 30 to 70% which varies depending on the country or region. Tuber size is an important factor to decide the seed requirement per unit area. Seed size affects total yield, graded or marketable tuber yields. Standard seed tuber of 25–125 g weight (30–55 mm) is known as seed size tubers in India. Obtaining seed size tuber is important for achieving higher potential of the cultivars. The tuber size profile can be reduced or expanded by altering inter and intra row seed spacing, controlling days of growth by planting late or killing vines/haulm early, regulating inputs like fertilizer and water etc. An ideal combination of plant population, row width, and in-row seed spacing for a particular variety were the major factors for optimizing tuber size. Variation in tuber bulking ability in different genotypes results in variation in proportion of seed size tubers among different varieties. 70–80 days haulm killing found most suitable for getting higher proportion of seed size tubers in high bulking varieties. Proper management of N, P and K fertilizers is considered very important to maximize tuber yield and attain desirable quality. Variability in nitrogen dose/ha was observed which ranged from 100–150 between different regions of the world. Hence proper combination of above Agro-techniques should be adopted in seed production programme as per the region for getting higher proportion of seed size/plantable seed tubers.

Production of seed potatoes in Queensland

1981 ◽  
Vol 21 (113) ◽  
pp. 631
Author(s):  
VJ Novak ◽  
IK Hughes
Keyword(s):  
Seed Potato ◽  
Certified Seed ◽  
Potato Production ◽  
Seed Potato Production ◽  
Seed Potatoes ◽  
Fresh Seed ◽  
Field Multiplication ◽  
Serious Disease ◽  
Seven Generations ◽  
Better Than

Seed potatoes of the Sebago cultivar were produced in Queensland from a single, pathogentested tuber by glasshouse and field multiplication. The seed potatoes, up to seven generations after release from the glasshouse, were compared in four, yearly, yield experiments with imported certified seed potatoes and in three experiments with locally saved seed. The crops produced from seed grown in Queensland yielded as well as, or better than, crops produced from both imported and locally saved seed. No serious disease problems arose in the production of the seed at various sites. Yields were satisfactory and commercial seed potato production in Queensland seems feasible. Two crops a year can be produced providing fresh seed for year round potato production.

Technical Efficiency in Seed Potato Production Systems in Uganda

2018 ◽  
Vol 10 (3(J)) ◽  
pp. 122-140
Author(s):  
Ambrose Rwaheru Aheisibwe ◽  
Razack B. Lokina ◽  
Aloyce S. Hepelwa
Keyword(s):  
Technical Efficiency ◽  
Seed Potato ◽  
Arable Land ◽  
Stochastic Frontier ◽  
Potato Production ◽  
Maximum Likelihood Estimates ◽  
Farm Income ◽  
Seed Potato Production ◽  
Extension Services ◽  
Income Source

This study established the level of technical efficiency and its determinants among the informal and formal seed potato producers in the southwestern highlands agro - ecological zone of Uganda. A multi- stage sampling procedure was employed to select 636 households (499 informal seed producers and 137 formal seed producers) from which data was collected for two seasons using a semi - structured questionnaire. Data was analyzed using the stochastic frontier approach with a one - step approach. Maximum likelihood estimates for the efficiency parameters showed that both informal and formal seed potato producers were not fully efficient. The mean technical efficiency for informal and formal seed potato producers was 8 1 .4 and 80.4 percent respectively. In terms of yield loss, informal and formal seed potato producers respectively lost an average of 981 and 1,208 kg/acre of seed potato tubers due to inefficiency factors . Specifically, off- farm income source, scale of production, seasonal variation, access to extension services and seed producer being male positively influenced informal seed producers’ technical efficiency while producers’ level of education and seed potato variety diversity negatively influenced their efficiency. For formal seed producers, technical efficiency was influenced positively by producers’ education and negatively by household size. The study suggests that there is an opportunity to improve technical efficiency of informal and formal seed producers by 19 and 20 percent respectively. Therefore, this calls for increased investment in developing and promoting high yielding varieties, provision of extension services, input intensification and addressing gender issues in seed potato production in the context of limited arable land .

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