Effects of weight and planting density of tubers derived from true potato seed on growth and yi ld of potato crops in Egypt. 2. Tuber yield and tuber size

SummaryThirty-two experiments examining the effects of the weight and within-row spacing of potato seed tubers on graded tuber yields of five varieties were conducted on eight sites from 1980 to 1985. A complex analysis technique was used to combine these data and estimate the optimum tuber planting densities for different ratios of seed cost to small (40–60 mm) and large (60–80 mm) ware value. The same technique could be applied to any other combination of seed cost, ware size and ware value.The optimum tuber planting density decreased with increasing seed-tuber weight. Differences in optimum planting density between varieties were much greater with small (35 g) than with large (105 g) seed tubers and decreased as the cost of seed increased relative to the value of ware. As large ware became worth more than small ware the influence of increasing seed cost on the optimum density was reduced. As the value of large ware increased, net returns increased and the effect of seed cost on net returns was reduced. Mean tuber size decreased with increasing stem density at harvest and at the same stem density was lower in varieties producing more daughter tubers/stem. Changes of mean tuber size (μ) and the spread of yield across size grades (σ) with time were well described by parallel curves in different varieties. It is suggested that in future it may not be necessary to determine optimum tuber planting densities by complex experiments involving several seed-tuber weights and spacings. Instead μ and σ could be estimated from simple experiments and tuber spacings determined by comparison with control varieties.

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Use of a simple model to study factors affecting the size distribution of tubers in potato crops

The Journal of Agricultural Science ◽

10.1017/s0021859600081788 ◽

1987 ◽

Vol 109 (3) ◽

pp. 563-571 ◽

Cited By ~ 15

Author(s):

K. Z. Travis

Keyword(s):

Mathematical Model ◽

Size Distribution ◽

Field Experiments ◽

Tuber Yield ◽

Tuber Size ◽

Simple Mathematical Model ◽

Factors Affecting ◽

Tuber Size Distribution ◽

Two Parameters ◽

Potato Crops

SummaryA simple mathematical model of the distribution of potato tuber yield between size grades is presented. It has two parameters, μ, a measure of crop tuber size and σ, a measure of the spread of yield across size grades. The model is shown to be useful for the analysis of field experiments, the prediction and physiological study of tuber size distribution, and the economic analysis of management decisions. The model is applied to a variety of dataandthe practical control of tuber size discussed.

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The effect of density on tuber yield in plants grown from true potato seed in seed beds during two contrasting seasons

American Potato Journal ◽

10.1007/bf02852941 ◽

1986 ◽

Vol 63 (9) ◽

pp. 465-472 ◽

Cited By ~ 9

Author(s):

S. G. Wiersema

Keyword(s):

Tuber Yield ◽

Potato Seed ◽

True Potato Seed

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True Potato Seed Production and its Economic Analysis as Influenced by Supplemental Nitrogen and Planting Density

Asian Journal of Plant Sciences ◽

10.3923/ajps.2008.73.78 ◽

2007 ◽

Vol 7 (1) ◽

pp. 73-78 ◽

Cited By ~ 2

Author(s):

Tuhin Suvra Roy ◽

Takashi Nishizawa ◽

Mohammed Hazrat Ali

Keyword(s):

Economic Analysis ◽

Seed Production ◽

Planting Density ◽

Potato Seed ◽

True Potato Seed

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Performance of Different Size True Potato Seed Seedling Tubers at Khumaltar

Nepal Agriculture Research Journal ◽

10.3126/narj.v6i0.3341 ◽

1970 ◽

Vol 6 ◽

pp. 35-38

Author(s):

Ram C Adhikari

Keyword(s):

Late Blight ◽

Ground Cover ◽

Tuber Size ◽

Potato Seed ◽

True Potato Seed ◽

Seed Tubers ◽

Research Journal ◽

Size Tuber ◽

Cut Seed ◽

Cut Seed Tubers

A field study was carried out at Khumaltar-Lalitpur, during 2002-2004 to evaluate and comparethe performance of different sizes of seedling tubers (1-5 g, 5-10 g, 10-20 g and 20-40 g) of truepotato seed (TPS) with whole and half cut seed tubers of Desiree of 20-40 g size at 60- × 25-cmspacing. Percent emergence, plant height, ground cover by foliage, stems/plant, number of tubersper plant, marketable and total yields were significantly increased with the increase in seedlingtubers weight as compared to whole and half cut seed tubers of Desiree. Late blight(Phytophthora infestans L.) disease was quite low in the TPS crops than Desiree. Both wholeand half cut seed tubers of Desiree produced significantly higher average per tuber weight.Uniformity of the tubers harvested from different sizes of seedling tubers was statisticallysimilar and tubers from Desiree were statistically uniform as compared to seedling tubers. Thethree years result suggests that more than 1 g size seedling tubers can be successfully used forpotato production as from the seed tubers of any standard variety.Key words: Desiree; seedling tuber; tuber size; tuber yieldDOI: 10.3126/narj.v6i0.3341Nepal Agriculture Research Journal Vol.6 2005 pp.28-34

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Effect of the developmental stage of potato seedlings on recovery after transplanting to the field and on tuber yield

The Journal of Agricultural Science ◽

10.1017/s0021859600072889 ◽

1995 ◽

Vol 124 (2) ◽

pp. 213-218 ◽

Cited By ~ 2

Author(s):

C. Engels ◽

J. Schwenkel ◽

R. El Bedewy ◽

B. Sattelmacher

Keyword(s):

Gibberellic Acid ◽

Tuber Yield ◽

Nile Delta ◽

Potato Seed ◽

True Potato Seed ◽

Assimilate Partitioning ◽

Solatium Tuberosum ◽

Below Ground ◽

Dim Light ◽

Lateral Branches

SUMMARYUnder the short-day conditions and cool temperatures prevailing from January to March in the Nile delta, Egypt, potato (Solatium tuberosum) seedlings grown from true potato seed formed tubers in the nursery when the plants were less than 5 cm in height. In order to examine the hypothesis that slow field establishment after transplanting and low tuber yields of these seedlings were caused by premature tuberization, different treatments to delay tuberization were applied in the nursery before transplanting.Increasing the air and soil temperature in the nursery accelerated both the development of the above-ground and below-ground shoot organs, but did not improve field establishment of the seedlings after transplanting. Extension of the photoperiod with incandescent dim light, exogenous application of gibberellic acid (GA), and removal of the shoot apex to encourage the growth of lateral branches from the leaf buds increased biomass allocation to the above-ground shoot organs, decreased tuberization in the nursery and accelerated field establishment of transplanted seedlings. Extension of the photoperiod was the most effective treatment to delay tuberization, and doubled the final tuber yield from transplanted seedlings.The results are in agreement with the hypothesis that poor field establishment and low final tuber yields from potato transplants may be caused by the presence of strong tuber sinks at transplanting, which reduce assimilate partitioning towards the roots and above-ground shoots.

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GENOTYPE BY ENVIRONMENT INTERACTION AND SELECTION IN TRUE POTATO SEED BEEDING

Experimental Agriculture ◽

10.1017/s0014479703001492 ◽

2003 ◽

Vol 40 (1) ◽

pp. 99-107 ◽

Cited By ~ 4

Author(s):

RODOMIRO ORTIZ ◽

ALI M. GOLMIRZAIE

Keyword(s):

Tuber Yield ◽

Genotype By Environment Interaction ◽

Potato Seed ◽

True Potato Seed ◽

Target Area ◽

Environment Interaction ◽

Lower Altitude ◽

Genotype By Environment ◽

Coastal Desert ◽

Andean Highlands

The aim of this work was to determine the importance of the genotype-by-environment interaction in true potato seed breeding. In order to establish the importance of this type of interaction, experiments were sited across three Peruvian locations, San Ramon (warm mid-altitude slopes), Huancayo (cool Andean highlands), and La Molina (coastal desert). The genotype by environment interaction significantly affected tuber yield in all breeding materials (4x-4x from random or selected parents, and 4x-2x crosses). For example, the 10 most outstanding 4x-2x crosses for tuber yield were different when tested in warm and cool locations. Similarly, two clones derived from 4x-4x crosses were among the best 15 hybrids assessed in the two lower altitude locations. These two offspring provide examples of crossover genotype-by-environment interaction for tuber set, non-cross order genotype-by-environment interaction for tuber yield and lack of genotype-by-environment interaction for days to flowering. Because top yielding true potato seed offspring for each location were locally adapted, cultivars or advanced selections from the target area should be the parental sources of true potato seed offspring.

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