Optimum Planting Interval as Affected by Size Distribution in Potato Yield

Pohjonen, Veli; Paatela, Juhani

doi:10.1080/00015127609435081

Cited by 3 publications

(3 citation statements)

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“…These estimated yields were then regressed on the seed-tuber planting density using a square-root relationship, allowing optimum planting density to be estimated for each combination of seed-tuber size and seed-tuber: ware price ratio. This technique is related to, but distinct from, those used by Pohjonen & Paatela (1976) and Sands & Regel (1983). Pohjonen & Paatela (1976) fitted a Gompertz curve to the cumulative frequency distributions of individual tuber weights.…”

Section: Discussionmentioning

confidence: 90%

“…This technique is related to, but distinct from, those used by Pohjonen & Paatela (1976) and Sands & Regel (1983). Pohjonen & Paatela (1976) fitted a Gompertz curve to the cumulative frequency distributions of individual tuber weights. This was then used to estimate economic yield per plot, which was, in turn, related to planting density by a modified rectangular hyperbola, which was used to estimate optimum planting density.…”

Section: Discussionmentioning

confidence: 90%

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Determination of optimum tuber planting density for production of tubers in processing ware grades in the potato variety Record

Wurr¹,

Fellows²,

Sutherland³

et al. 1990

J. Agric. Sci.

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A series of experiments examining the influences of size and spacing of planted potato tubers (' seed' tubers) on tuber yields was conducted at four sites in the UK in 1982-84. A new approach to data analysis was used to estimate the optimum tuber planting density for different ware grades. The optimum density, which maximized returns, decreased with increasing seed tuber weight and ratio of seed-tuber cost to ware value and with lower than average total tuber yields. Changing the required ware grade from 40-65 mm to 40-80 mm had a minimal effect on the optimum tuber planting density.Optimum tuber planting densities were lower than in published recommendations but this disparity appeared to be accounted for by differences in the number of stems produced by each planted tuber. There was some evidence that, with lower seed-tuber weights, the optimum planting density differed with site and that at optimum economic densities small and medium seed tubers outyielded large seed tubers.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 90%

Determination of optimum tuber planting density for production of tubers in processing ware grades in the potato variety Record

Wurr¹,

Fellows²,

Sutherland³

et al. 1990

J. Agric. Sci.

View full text Add to dashboard Cite

show abstract

“…In many countries tubers are usually graded by weight, and two models of size distribution based on weight have been developed (Pohjonen & Paatela, 1976;Sands & Regel, 1983). In other countries such as the U.K., tubers are graded by size, usually by means of square-meshed sieves or riddles.…”

Section: Introductionmentioning

confidence: 99%