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

Abstract

-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.

Effects of Closing Cut Date and Nitrogen Fertilization on Seed Yield and Seed Quality in Two Novel Cultivars of Urochloa spp.

“…[10] These findings clearly show that FTP and IN had a positive relationship (Table 5). This corroborates with previous results [43], which reported that late cuts in relation to the cycle of forage grasses can have negative effects on the productivity of seeds, possibly by reducing the photosynthetic area and eliminating reproductive parts of the tiller. The increased IN in the closing cut treatments was found to be related to the increased seed yields.…”

“…'OKI-1' was 147-163 days (15 June-1 July) before seed harvest. The total number of 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 [43]. Several studies (e.g., [44][45][46]) have reported that optimum tiller density affects increased forage and seed yields.…”

Effects of cutting on vegetative development and biomass quality of perennial halophytes grown in saline aquaponics

“…A similar lack of biomass response was observed in P. dilatatum (Bungenstab et al, 2013). Paspalum guenoarum improved its biomass when subjected to two cuttings rather than one cutting (Lopes et al, 2016). Vigorous regrowth of aerial structures does not always generate a similar gain in biomass due to the different energetic and structural prices of plant modules that need to be formed.…”

“…Light-improving conditions stimulate basal buds to form new tillers (Baréa et al, 2007;Beck, 2012). In contrast, P. atratum (Hare et al, 2001) and P. dilatatum [biotype Virasoro;Scheffer-Basso et al (2007); ecotype Bagual; Beck (2012)] showed no cutting effect on tiller production, and Paspalum guenoarum ecotype Azulão decreased the number of tillers after two consecutive cuts (Lopes et al, 2016). The plant species may also differ in their capacity to regrow and produce new leaves.…”

Genetic parameters and predicted gains with selection of interspecific hybrids of Paspalum for seed production

“…According to the literature, the main components of the production of Paspalum seeds are the TT, RT, NSI and WTS traits (Lopes and Franke 2011, Lopes et al 2016, Lopes et al 2017. The use of these traits favors the choice of superior performance genotypes, through indirect selection in traits of difficult selection and measurement, such as seed production.…”