Optimum Plot Size and Number of Replications for Estimating Forage Yield and Moisture Percentage<sup>1</sup>

Thomas, H. L.; Abou-El-Fittouh, H. A.

doi:10.2134/agronj1968.00021962006000050031x

Cited by 5 publications

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“…This may be partly due to inadequate field plot technique. Experimental error can be reduced by increasing plot size and the number of replicates (Thomas & Abou-El Fittouh 1968).…”

Section: Discussionmentioning

confidence: 99%

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Oliveira¹,

López²,

Palencia³

2013

CZECH J GENET PLANT

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Oliveira J.A., López J.E., Palencia P. White clover (Trifolium repens L.) is an essential element of sustainable livestock systems in temperate climates because of its adaptability to a range of management and soil fertility conditions. The performance of 15 accessions of white clover collected in northern Spain, and of two cultivars, the medium-leaved Huia and the large-leaved California, grown as spaced plants in Galicia, and in sward plots in Asturias was compared over a period of two years. The data obtained were reduced to two principal components that cumulatively explained 92.4% of the total variance. Cluster analysis identified three groups of accessions that described 71% of the phenotypic variation among accessions. One group of five accessions collected from upland sites was characterized by low dry matter yield, low height, reduced plant spread, short petioles, small leaves and thin stolons. This group can be defined as small-leaved and of interest for gardening. Another group, composed only by the cv. California and the cv. Huia, was characterized by high plant spread and height, long wide leaves and thick petioles and stolons; dry matter yields were similar to those of the first group. The last group, which includes ten accessions collected from low and medium altitude sites, had the highest dry matter yields and intermediate morphological character between the previous groups. This group can be defined as medium-leaved and of interest for grazing and/or cutting.

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“…This may be partly due to inadequate field plot technique. Experimental error can be reduced by increasing plot size and the number of replicates (Thomas & Abou-El Fittouh 1968).…”

Section: Discussionmentioning

confidence: 99%

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Oliveira¹,

López²,

Palencia³

2013

CZECH J GENET PLANT

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“…Optimum plot size and number of replications for yield have been estimated for several different crops, both agronomic and horticultural (Gupta and Raghavarao, 1971;Saito and Ohtake, 1996;Shamasundaran and Bhat, 1997;Singh, 1989;Szunics and Balla, 1975;Thomas and Abou-El Fittouh, 1968). Singh (1989) in uniformity trials with chile peppers (Capsicum annuum L.) found an optimum plot size of 6 to 8 m 2 with 30 to 40 plants.…”

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confidence: 99%

Optimum Plot Size and Number of Replications with Short-day Onions for Yield, Seedstem Formation, Number of Doubles, and Incidence of Foliar Diseases

Boyhan¹,

Langston²,

Purvis³

et al. 2003

jashs

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Five different statistical methods were used to estimate optimum plot size and three different methods were used to estimate optimum number of replications with short-day onions (Allium cepa L.) for yield, seedstem formation (bolting), purple blotch and/or Stemphylium (PB/S), botrytis leaf blight (BLB), and bulb doubling with a basic plot size unit of 1.5 × 1.8 m (length × width). Methods included Bartlettʼs test for homogeneity of variance, computed LSD values, maximum curvature of coeffi cient of variation plotted against plot size, Hathewayʼs method for a true mean difference, and Cochran and Coxʼs method for detecting a percent mean difference. Bartlettʼs chi-square was better at determining optimum plot size with transformed count and percent data compared with yield data in these experiments. Optimum plot size for yield of fi ve basic units (7.5 m length) and four replications is indicated using computed LSD values where the LSD is <5% of the average for that plot size, which was the case in both years of this study. Based on all the methods used for yield, a plot size of four to fi ve basic units and three to fi ve replications is appropriate. For seedstems using computed LSD values, an optimum plot size of four basic units (6 m length) and two replications is indicated. For PB/S two basic units (3 m length) plot size with four replications is indicated by computed LSD values. For BLB a plot size of four basic units (6 m length) and three replications is optimum based on computed LSD values. Optimum plot size and number of replications for estimating bulb doubling was four basic units (6 m length) and two replications with 'Southern Belleʼ, a cultivar with a high incidence of doubling using computed LSD values. With 'Sweet Vidaliaʼ, a cultivar with low incidence of bulb doubling, a plot size of four basic units (6 m length) and fi ve replications is recommended by computed LSD values. Visualizing maximum curvature between coeffi cient of variation and plot size suggests plot sizes of seven to eight basic units (10.5 to 12 m length) for yield, 10 basic units (15 m length) for seedstems, fi ve basic units (7.5 m length) for PB/S and BLB, fi ve basic units (7.5 m length) for 'Southern Belleʼ doubling, and 10 basic units (15 m length) for 'Sweet Vidaliaʼ doubling. A number of plot size-replication combinations were optimum for the parameters tested with Hathewayʼs and Cochran and Coxʼs methods. Cochran and Coxʼs method generally indicated a smaller plot size and number of replications compared to Hathewayʼs method regardless of the parameter under consideration.Overall, both Hathewayʼs method and computed LSD values appear to give reasonable results regardless of data (i.e., yield, seedstems, diseases etc.) Finally, it should be noted that the size of the initial basic unit will have a strong infl uence on the appropriate plot size.

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“…In general, experimental error is reduced by increasing plot size (Immer and Raleigh, 1933;McClelland, 1926;McKenzie et al, 1964). Conversely, others found that the experimental error was reduced significantly when the number of replications rather than plot size was increased (Rampton and Petersen, 1962;Thomas and Abou-El Fittouh, 1968). Li (1971) in Taiwan found that the optimum plot size for the winter sermon sweetpotato crop was 6 to 12 m long and three rows wide (18 to 36 m 2 ) in Changlma, and 8 to 12 m long and three rows wide (24 to 36 m 2 ) in Hsinchu.…”

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Plot Technique Studies on Sweetpotato Yield Trials

Vallejo¹,

Mendoza²

1992

jashs

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The objective of this research was to determine optimum plot size and number of replications to evaluate yield of sweetpotato (Ipomoea batatas Lam.) clones. The optimum plot size was estimated using the methods of maximum curvature and comparison of variances. The adequate number of replications was determined using the Hatheway method. Using the maximum curvature method, the estimated optimum plot size was 10 basic units (b.u. = six plants or 1.2 m2) for La Molina and San Ramon, and 5 b.u. for Tacna, Peru. Using the comparison of variances method, the optimum plot size was 15 b.u. for all locations tested. The adequate number of replications with a plot size of 15 b.u. was four.

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Optimum Plot Size and Number of Replications for Estimating Forage Yield and Moisture Percentage¹

Cited by 5 publications

References 0 publications

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Optimum Plot Size and Number of Replications with Short-day Onions for Yield, Seedstem Formation, Number of Doubles, and Incidence of Foliar Diseases

Plot Technique Studies on Sweetpotato Yield Trials

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Optimum Plot Size and Number of Replications for Estimating Forage Yield and Moisture Percentage1

Cited by 5 publications

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Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Agromorphological characterization, cyanogenesis and productivity of accessions of white clover (Trifolium repens L.) collected in Northern Spain

Optimum Plot Size and Number of Replications with Short-day Onions for Yield, Seedstem Formation, Number of Doubles, and Incidence of Foliar Diseases

Plot Technique Studies on Sweetpotato Yield Trials

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Optimum Plot Size and Number of Replications for Estimating Forage Yield and Moisture Percentage¹