Frost damage to winter wheat in the UK: the effect of plant population density

An experiment was carried out to study the effects of the following population densities cauliflowers (plants per ha): 20,833 (0.60 m x 0.80 m), 25,641 (0.60 m x 0.65 m), ....37.037 (0.60 m x 0.45 m) , 55.555 (.0.60 m x 0.30 m), and 111,111 (0,60 m x 0,15 m) ; variety Snow ball. It was concluded that the effects of plant population density are greater on curd quality (weight and size) than on production per ha. The best plant population density to produce cauliflowers curd for Brazil market is from 20,000 to 25,000 plants/ha while for mini-curd is above 55,000 plants/ha.

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Plant Population Density Effects on Seed Yield of Birdsfoot Trefoil 1

Agronomy Journal ◽

10.2134/agronj1986.00021962007800010040x ◽

1986 ◽

Vol 78 (1) ◽

pp. 201-205 ◽

Cited By ~ 9

Author(s):

R. L. McGraw ◽

P. R. Beuselinck ◽

K. T. Ingram

Keyword(s):

Population Density ◽

Seed Yield ◽

Plant Population ◽

Birdsfoot Trefoil ◽

Density Effects ◽

Plant Population Density

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Grain Yield Gains and Associated Traits in Tropical X Temperate Maize Germplasm Under High and Low Plant Density

10.21203/rs.3.rs-401021/v1 ◽

2021 ◽

Author(s):

Vince Ndou ◽

Edmore Gasura ◽

Pauline Chivenge ◽

John Derera

Keyword(s):

Population Density ◽

Grain Yield ◽

Plant Density ◽

Plant Population ◽

Population Densities ◽

Genetic Gains ◽

Maize Germplasm ◽

High Plant Density ◽

Number Of Leaves ◽

Plant Population Density

Abstract Development of ideal breeding and crop management strategies that can improve maize grain yield under tropical environments is crucial. In the temperate regions, such yield improvements were achieved through use of genotypes that adapt high plant population density stress. However, tropical germplasm has poor tolerance to high plant population density stress, and thus it should be improved by temperate maize. The aim of this study was to estimate the genetic gains and identify traits associated with such gains in stable and high yielding temperate x tropical hybrids under low and high plant population densities. A total of 200 hybrids derived from a line x tester mating design of tropical x temperate germplasm were developed. These hybrids were evaluated for grain yield and allied traits under varied plant population densities. High yielding and stable hybrids, such as 15XH214, 15XH215 and 15XH121 were resistant to lodging and had higher number of leaves above the cob. The high genetic gains of 26% and desirable stress tolerance indices of these hybrids made them better performers over check hybrids under high plant population density. At high plant population density yield was correlated to stem lodging and number of leaves above the cob. Future gains in grain yield of these hybrids derived from temperate x tropical maize germplasm can be achieved by exploiting indirect selection for resistance to stem lodging and increased number of leaves above the cob under high plant density conditions.

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