Influence of time and level of urea application on seed production of Paspalum plicatulum at Mt. Cotton, south-eastern Queensland

Chadhokar, P. A.; Humphreys, L. R.

doi:10.1071/ea9730275

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Carámbula (1981) states that increasing the number of cuts tends to reduce this variable, possibly due to the elimination of the first inflorescences, recognized by the literature as more productive than those that appear later. Chadhokar and Humphreys (1973) also observed a reduction in the number of racemes in the inflorescences of P. plicatulum issued later.…”

Section: Resultsmentioning

confidence: 89%

“…According to West and Pitman (2001), the plants in the tropics and subtropics are short-day or day-neutral. In P. plicatulum and P. atratum, short days are favorable for inducing the expression of reproductive processes, i.e., when the duration of night is equal or greater than a specific value, called the critical photoperiod (Chadhokar and Humphreys, 1973;Hare et al, 2001). However, for P. dilatatum, the flowering does not depend on the photoperiod, but occurs in response to other stimuli (water availability and temperature) (Skerman and Riveros, 1992).…”

Section: Resultsmentioning

confidence: 99%

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Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

et al. 2016

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-The objective of this study was to evaluate the practice of consecutive cuts in the production and quality of Paspalum guenoarum seeds of the "Azulão" ecotype. The experimental design used was in completely randomized blocks with four replications. The treatment included three cuts in succession: zero cut, one cut, two cuts, and three cuts. The variables were: number of total tillers/plant; number of vegetative tillers/plant; number of reproductive tillers/plant; percentage of reproductive tillers; number of racemes/inflorescence; weight of thousand seeds; number of seeds/inflorescence; seed production; forage dry matter; water content of seeds; germination; first germination count; and germination speed index. The largest seed production was obtained with zero cut (850.3, first year and 719.4 kg/ha -1 , second year) and one cut (794.4, first year and 627.3 kg/ha -1 , second year) with no statistical difference between them. The largest germination percentage was seen with the application of zero (71.0%, first year and 79.3%, second year) and one cut (69.3%, first year and 75.0%, second year). There was a decrease in the production and quality of the seeds of the second cut, especially during the first year of evaluation. The total tillers, the percentage of tillers that went through the reproductive stage, and the number of reproductive tillers are the variables that are most highly correlated with seed production.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

et al. 2016

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“…The authors attributed the difference in yield to the variation in spring and summer rainfall during both years. In addition, Chadhokar and Humphreys (1973) showed that Paspalum plicatulum Michx. produced greater seed set (85–95%) during the first year of seed production, whereas seed set was reduced during the second and third production year (50–60%).…”

Section: Discussionmentioning

confidence: 99%

Managing forage and turf‐type bahiagrass for seed production

et al. 2020

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Bahiagrass (Paspalum notatum Flüggé) is the most extensively cultivated perennial warm-season grass in the southeastern United States for pasture, utility turf, cover cropping, and soil stabilization. The University of Florida Institute of Food and Agricultural Sciences bahiagrass breeding program has recently selected several improved forage-and dwarf-turf-type tetraploid breeding lines. However, seed production and seed quality quantification is needed before proposing any of these lines for cultivar release. The objectives of this study were (a) to evaluate seed production in seven tetraploid bahiagrass breeding lines (two forage-type apomictic hybrids, and five turftype facultative apomicts) and the cultivar 'Argentine', and (b) to determine the optimum management practices (defoliation timing [May, June] and N rate [0, 60, and 120 kg N ha −1 ]) to increase seed yield and quality. Six seed traits were evaluated during 2 yr (first and second production year) under a randomized complete block design in a strip-split-plot arrangement with three replications. Eight genotypes (main plot), two defoliation timings (subplot), and three N fertilization rates (sub-subplot) were tested. All breeding lines produced viable seed comparable with Argentine, although some of them exhibited very low reproductive efficiency. Nitrogen fertilization improved seed yield by increasing inflorescence density but did not affect seed quality traits. Defoliation in May produced greater seed yield, whereas defoliation in June resulted in greater seed quality, especially for turf-type genotypes. The information generated in this study will guide cultivar release(s) and will be used to develop targeted recommendation practices for seed production in the species.Abbreviations: PCA, principal component analysis.

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Urea application and time of harvest effects on seed production of Setaria anceps cv. Narok

Bahnisch¹,

Humphreys²

1977

Aust. J. Exp. Agric.

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Three levels of urea (50, 100 and 200 kg N ha-1 crop-1) and three methods of application were tested on four irrigated crops of Setaria anceps cv Narok grown for seed on a grey-brown podzolic soil. Pure seed yield was increased by urea application at post-harvest cleaning cut. The second year summer crop was more responsive to nitrogen than the seedling or the autumn crops. Inflorescence density exerted the primary control over seed yield. Urea application increased the tiller fertility and tillering of some crops. Negative compensatory effects were evident in seed density per unit inflorescence length. Late application of nitrogen at early heading increased the survival of late formed tillers which did not contribute to harvested seed yield. Optimum harvest time coincided with maximum seed density, usually occurred before maximum inflorescence density, and was associated with the inflorescences exserting 20 to 35 days previously.

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Influence of time and level of urea application on seed production of Paspalum plicatulum at Mt. Cotton, south-eastern Queensland

Cited by 4 publications

References 6 publications

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

Management of consecutive cuts in the production and quality of wintergreen paspalum seeds

Managing forage and turf‐type bahiagrass for seed production

Urea application and time of harvest effects on seed production of Setaria anceps cv. Narok

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