Determination of optimum tuber planting density in the potato varieties Pentland Squire, Cara, Estima, Maris Piper and King Edward

Abstract

S U M M A R YThirty-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 (ji) and the spread of yield across size grades (<r) 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 fi and a could be estimated from simple experiments and tuber spacings determined by comparison with control varieties.

Modeling Long-Term Trends in Russet Burbank Potato Growth and Development in Wisconsin

“…Tuber size response to stem number per plant and thermal time has been reported previously [6,13,[32][33][34][35]. Consistent with previous reports, average tuber length decreased with increasing stem number per plant.…”

“…This relationship has been observed and reported in previous research [6,13,[32][33][34][35]. Interestingly, we were able to fit one model across all years of data and explain 45.1% of the variation in average number of tubers per plant using only thermal time and the number of stem number per plant.…”

Analysis of Genetical Diversity of Some of the Tetraploides Potato Cultivars Grown in Iran

“…And, for mite pest, the pesticide Neuron 1/1000 and larvin 0.5/1000 were used. For aphid pest, Kenfidor 0.5/1000, and for Bemisia, Diazinon 1/1000 was used [6].…”

“…These differences among varieties were because of their genetic of late or early maturing and also their responses to the length of the days and the temperatures of the environment. There are reports indicating that, in the varieties, which had germination process lately, tuberization and flowering are happened early [6,17].…”

Seed Piece Spacing Influences Yield, Tuber Size Distribution, Stem and Tuber Density, and Net Returns of Three Processing Potato Cultivars

“…1999. Plant population studies were among the earliest and most common field experiments involving potatoes (Houghland and Parker, 1948). Similar work continues, with recent studies being conducted for optimizing crop production and profitability (Rex, 1991;Wurr et al, 1992). Plant population studies with potatoes are never outdated because of unique tuber characteristics of new cultivars and the changing tuber size requirements of evolving industries (Barry et al, 1981;Wurr et al, 1993).…”